The Influence of the pH Value and the Cation Composition of Dispersion Medium on the Formation of Iron-Oxygen Structures on Steel Surface
The peculiarities of the formation of iron-oxygen structures on steel surface due to its contact with aqueous dispersion medium within a wide range of pH values and in presence of cobalt and silver have been studied by X-ray diffraction in situ. It has been shown that well crystallized cobalt- and i...
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| Опубліковано в: : | Хімія, фізика та технологія поверхні |
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| Дата: | 2011 |
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Інститут хімії поверхні ім. О.О. Чуйка НАН України
2011
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| Цитувати: | The Influence of the pH Value and the Cation Composition of Dispersion Medium on the Formation of Iron-Oxygen Structures on Steel Surface / O.M. Lavrynenko, S.V. Netreba, V.A. Prokopenko, Ya.D. Korol // Хімія, фізика та технологія поверхні. — 2011. — Т. 2, № 1. — С. 93-100. — Бібліогр.: 18 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1860270161225842688 |
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| author | Lavrynenko, O.M. Netreba, S.V. Prokopenko, V.A. Korol, Ya.D. |
| author_facet | Lavrynenko, O.M. Netreba, S.V. Prokopenko, V.A. Korol, Ya.D. |
| citation_txt | The Influence of the pH Value and the Cation Composition of Dispersion Medium on the Formation of Iron-Oxygen Structures on Steel Surface / O.M. Lavrynenko, S.V. Netreba, V.A. Prokopenko, Ya.D. Korol // Хімія, фізика та технологія поверхні. — 2011. — Т. 2, № 1. — С. 93-100. — Бібліогр.: 18 назв. — англ. |
| collection | DSpace DC |
| container_title | Хімія, фізика та технологія поверхні |
| description | The peculiarities of the formation of iron-oxygen structures on steel surface due to its contact with aqueous dispersion medium within a wide range of pH values and in presence of cobalt and silver have been studied by X-ray diffraction in situ. It has been shown that well crystallized cobalt- and ironcontaining spinel ferrites are formed at neutral pH value of aqueous medium. The contact of steel surface with alkaline medium results in formation of weakly crystallized iron oxyhydroxides. The structure of lepidocrocite is formed on steel surface due to its contact with acid dispersion medium in absence of metal ions such as cobalt and silver.
Методом рентгенофазового аналізу in situ досліджено особливості формування залізо-кисневих структур на поверхні сталі при її контакті з водним дисперсійним середовищем у широкому діапазоні значень рН та в присутності кобальту і срібла. Показано, що добре окристалізовані структури феришпінелі – магнетиту і фериту кобальту утворюються при нейтральних значеннях рН середовища. При контакті сталі з лужним дисперсійним середовищем на поверхні у всіх випадках утворюються слабко окристалізовані оксигідроксиди заліза. Структура лепідокрокіту утворюється на поверхні сталі при її контакті з кислим дисперсійним середовищем за відсутності катіонів.
Методом рентгенофазового анализа in situ исследованы особенности формирования железо-кислородных структур на поверхности стали при ее контакте с водной дисперсионной средой в широком диапазоне значений рН и в присутствии кобальта и серебра. Показано, что хорошо окристаллизованные структуры ферришпинели – магнетита и феррита кобальта формируются при нейтральных значениях рН среды. При контакте стали со щелочной дисперсионной средой на поверхности во всех случаях образуются слабо окристаллизованные оксигидроксиды железа. Структура лепидокрокита образуется на поверхности стали при ее контакте с кислой дисперсионной средой в отсутствие катионов.
|
| first_indexed | 2025-12-07T19:05:44Z |
| format | Article |
| fulltext |
Хімія, фізика та технологія поверхні. 2011. Т. 2. № 1. С. 93–100
_____________________________________________________________________________________________
ХФТП 2011. Т. 2. № 1 93
UDC 543.442.2:549.057+544.77
THE INFLUENCE OF THE pH VALUE
AND THE CATION COMPOSITION OF DISPERSION MEDIUM
ON THE FORMATION OF IRON-OXYGEN STRUCTURES
ON STEEL SURFACE
O.M. Lavrynenko1, S.V. Netreba1, V.A. Prokopenko1, Ya.D. Korol2
1Ovcharenko Institute of Biocolloidal Chemistry of National Academy of Sciences of Ukraine
42 Vernadsky Ave., Kyiv 03142, Ukraine, ibcc@ukrpost.ua
2 Bogdan Khmelnitsky National University of Cherkassy
81 Shevchenko Ave., Cherkassy 18031, Ukraine, king@cdu.edu.ua
The peculiarities of the formation of iron-oxygen structures on steel surface due to its contact with
aqueous dispersion medium within a wide range of pH values and in presence of cobalt and silver have
been studied by X-ray diffraction in situ. It has been shown that well crystallized cobalt- and iron-
containing spinel ferrites are formed at neutral pH value of aqueous medium. The contact of steel surface
with alkaline medium results in formation of weakly crystallized iron oxyhydroxides. The structure of lepi-
docrocite is formed on steel surface due to its contact with acid dispersion medium in absence of metal
ions such as cobalt and silver.
INTRODUCTION
The problem of nowadays which is formu-
lated for scientists who are studying the systems
with nanosized objects is the directional obtaining
of the individual particles with particular phys-
icochemical, colloid-chemical and mineralogical
properties [1]. When introducing an insignificant
addition of such particles into macrosystems and
composite materials of different nature they ac-
quire new physicochemical properties [2]. The
nanosized particles with para- and ferrimagnetic
properties are the most required for medical and
biological aims, for example as magnetic carriers
for direct delivery of medical preparations in a
magnetic field [3], target therapy [4], diagnostics
of a range of diseases [5].
Numerous methods of formation of the iron-
oxygen particles of different crystallographic
modifications include the electrochemical synthe-
sis on the surface of iron (steel) [6] and inert
(gold, silver, platinum) [7] electrodes. The advan-
tages of such systems lie in limiting the admix-
ture quantity in iron oxide and controlling the
process of phase formation. Addition of different
compounds such as metal salts into the system
gives a possibility to get the particles of spinel
ferrites [8] or ‘core-shell’ composites [9] that
have wider variety of use than simple iron oxides
and hydroxides. A study on the initial stage of
formation of the iron-oxygen structures on steel
surface should allow us to expand the spectrum of
iron oxides, oxyhydroxides, and spinel ferrites
and to define the most important parameters of
synthesis controlling this process.
The present work is an extension of the inves-
tigation of the processes of phase formation on
steel surface by its contact with air oxygen and
aqueous dispersion medium. In our previous arti-
cle [10] a process was shown of the formation of
surface iron-oxygen particles caused by the con-
tact of steel with ferric and ferrous aqueous solu-
tions. The results showed the formation of the
Fe(II)-Fe(III) layered double hydroxides at the
initial stage of the phase formation that were
transformed into structures of magnetite, goethite
or lepidocrocite depending on the presence of
oxidant and ferrous or ferric irons in dispersion
medium. The aim of this work is to study the process
of the formation of the surface iron-oxide structures
due to the contact of steel surface with aqueous solu-
tion within a wide pH range and in the presence of
cobalt chloride and silver nitrate in aqueous solution.
EXPERIMENTAL
The process of the formation of different
iron-oxygen structures on steel surface have been
carried out by procedure described in [10]. For
O.M. Lavrynenko, S.V. Netreba, V.A. Prokopenko, Ya.D. Korol
_____________________________________________________________________________________________
94 ХФТП 2011. Т. 2. № 1
the experiment the carbon steel was used contain-
ing %: С – 0.14-0.22; Si – 0.05-0.15; Mn – 0.4-
0.65; Cr – 0.3; Ni – 0.3; P – 0.04; S – 0.05; N –
0.01. The main method of investigation was
X-ray diffraction in situ. An additional method
was scanning electron microscopy. The disper-
sion media were aqueous solutions within wide
range of pH values (from 1.5 to 11.0) prepared by
addition of definite quantities of hydrochloric
acid or sodium hydroxide solutions into disper-
sion medium. For the preparation of the cobalt-
containing solutions, cobalt chloride was used
with cobalt concentration of 100 mg/dm3. And for
silver-containing solution, silver nitrate was cho-
sen with silver concentration of 1 mg/dm3. The
range of pH values with added cations was from
2.5 to 11.0.
The process of formation of the iron-oxygen
structures was carried out to the stationary state
of the system that meant the constant phase com-
position and mass of the surface structures as well
as the chemical composition of the dispersion
medium. For the chemical analysis of the disper-
sion medium, the standard procedure was used
[11].
RESULTS AND DISCUSSION
The influence of the pH value on the forma-
tion of iron-oxygen structures on steel surface.
The study on the process of formation of the iron-
oxygen structures on steel surface within a wide
range of pH value was carried out considering the
state of ferrous and ferric iron in dispersion me-
dium. Our investigation [12] shows five charac-
teristic ranges of pH values defining the processes
of arising and developing iron-oxygen structures
of different crystallographic modifications which
run due to various mechanisms. At the same time,
on the basis of experimental data [13] and the
analysis of the thermodynamic functions of the
reaction of the phase formation [8] a supposition
was made about the behavior of the system Fe0
(Steel) – H2O –O2 capable to change the pH val-
ues of the initial solution in the wide range of pH
to neutral value. Direct testing of this factor using
specified indicators (nitrasin yellow and phenolic
red) shows the pH value in the range from 7.0 to
9.0 on steel surface. So, the XRD-investigation of the
process of phase formation on steel surface in situ
should allow us defining the degree of the influence
of the pH value in the bulk of dispersion medium on
the surface composition of iron-oxygen structures
and their phase transformations.
Analysis of XRD-data shows the formation
mainly of the phases of Green Rust, lepidocrocite
and magnetite on steel surface. An additional
phase is goethite.
At the pH value of 1.5 in aqueous dispersion
medium both ferric and ferrous iron as well as
mainly mononuclear ferric hydroxocomplexes –
Fe(OH)2
+ and Fe(OH)2+ can be present. XRD-data
show that under such condition as the initial
phase after 2 hours of carrying out the process
lepidocrocite (020) and (120) is formed. The in-
tensity and quantity of the X-ray reflexes gradu-
ally increase. Lepidocrocite remains as the only
phase up to the stationary state of the system
(72 h). By the increasing the initial pH value to
4.0 in dispersion medium, ferric iron forms the
separate phase of amorphous ferric hydroxide and
ferrous iron is still in the form of hydrated
cations. After one hour of the contact of steel
with dispersion medium on its surface, the phase
of lepidocrocite is formed. Magnetite is reflected
on XRD-pattern after 5 hours and its intensity
increases more than three times to the stationary
state of the system (48 h). At the pH value of 6.5
in the system, the hydrolysis starts of the ferrous
iron with the formation of the FeOH+ complex.
After 2 hours, lepidocrocite appears, and after
5 ones, magnetite appears on the surface. The
accumulation of magnetite on steel surface under
such a condition is faster than the accumulation
of lepidocrocite. The system is stabilized after
48 hours of contact. At the pH = 11.0, ferric and
ferrous hydroxides form the precipitate in the sys-
tem. As XRD-data show, the surface structures
are weakly crystallized and diffraction patterns
show only some reflexes of Green Rust I and low
intensity peaks of lepidocrocite. After 24 hours of
the phase formation on steel surface, two peaks
appear of magnetite (311) and (220) which inten-
sity insignificantly grows. Figure 1 shows the
kinetic regularities of changing of the % mass of
lepidocrocite (Fig. 1a) and magnetite (Fig. 1b)
depending on the value of initial pH of dispersion
medium.
On the base of the data obtained, the opti-
mum condition for direct formation of the iron
oxyhydroxide – lepidocrocite is acid dispersion
medium and for magnetite formation is neutral
dispersion medium.
The Influence of the pH Value and the Cation Composition of Dispersion Medium on the Formation
_____________________________________________________________________________________________
ХФТП 2011. Т. 2. № 1 95
a
b
Fig. 1. Intensity of X-ray reflexes: a – lepidocrocite,
b – magnetite formed on steel surface due to its
contact with dispersion medium at initial pH
values: 1 – 1.5; 2 – 4.0; 3 – 6.5; 4 – 11.0
The possible reactions can occur in such con-
ditions are: for oxyhydroxides
2Fe(OH)2 + 0,5O2 → 2FeOOH + H2O (1)
Fe(OH)2+ + OH- → Fe(OH)2
+ →
→ FeOOH + H+ (2)
Fe(OH)2
+ + 2Fe(OH)2 + 0,5O2 →
→ 3FeOOH + H2O + H+ (3)
and for magnetite (or spinel ferrite):
2Fe(OH)2+ Ме
2+
+ 1/2О
2
→
→ МеFe
2
O
4
+ H2O+2Н
+ (4)
2Fe(OH)
+
+ Ме(ОН)
2
+ 1/2О
2
→
→ МеFe
2
O
4
+ Н
2
О + 2Н
+ (5)
2Fe(OH)
2
+ Ме(ОН)
2
+ 1/2О
2
→
→ МеFe
2
O
4
+ 3Н
2
О (6)
where Ме(II) = Fe(II), Co(II).
The absence of the vivid reflexes on the
XRD-patterns of Green Rust can indicate that this
structure is not accumulated on steel surface and
undergoes the phase transformation immediately
after formation of lepidocrocite or magnetite
phases. The development of the lepidocrocite or
magnetite can run either independently from each
other (at pH = 6.5) or they are the chain links of
the phase transformation: lepidocrocite–magnetite
(at pH=4.0).
The formation of the iron-oxygen structures
on steel surface due to its contact with the cobalt
chloride aqueous solution. The addition of cobalt
ions into the dispersion medium influences the
phase composition of ultra disperse iron-oxygen
particles and leads to the formation the iron-
cobalt spinel ferrite as an additional phase [14].
This process to a considerable degree depends on
the pH value of the dispersion medium contacting
with steel surface and does not significantly de-
pends on the quantity of cobalt ions in the solu-
tion. Cobalt ions undergo to hydrolysis within the
range of pH 6.6–9.2 (by ССо(II) = 1 mol/dm3) and
at the range of pH 9.2–14.1 cobalt remains as hy-
droxide in the system [15].The investigation of
the phase composition of the surface structures
was carried out depending on the speciation of
cobalt in the dispersion medium.
As XRD-data show (Fig. 2a), in the presence
of cobalt ions on steel surface, spinel ferrite (311)
is formed during one hour and its intensity picks
increase during 24 hours. The lepidocrocite phase
appears only after 24 hours from the beginning of
the process of phase formation (Fig. 2b). During
next 24 hours the intensity of spinel ferrite re-
flexes slowly decreases and that of lepidicrocite
reflexes increases. The possible mechanism of
this process is the destruction of spinel ferrite, for
example by oxidizing ferrous iron in the lattice.
When the dispersion medium contains cobalt hy-
droxide, the formation of surface structures is
connected with that of weakly crystallized iron
oxyhydroxides – lepidocrocite and goethite (Fig.
3c). The phase of spinel ferrite is identified only
after 24 hours of phase formation (Fig. 2d).
O.M. Lavrynenko, S.V. Netreba, V.A. Prokopenko, Ya.D. Korol
_____________________________________________________________________________________________
96 ХФТП 2011. Т. 2. № 1
a
b
c
d
Fig. 2. XRD-data of surface structures formed on steel
surface due to its contact with cobalt-containing
dispersion medium: a – pH=6.5 after 4 h of
contact of steel with solutions; b – pH=6.5 after
24 h; с – pH=11.0 after 1 h; d – pH=11.0 after
24 h. Numbers correspond to the phases: 1 –
cobalt ferrous spinel ferrite, 2 – lepidocrocite γ-
FeOOH; 3 – goethite α-FeOOH, 4 – iron Fe0
Figure 3 shows the SEM-images of steel sur-
face. There are the areas of the iron-oxygen struc-
tures appearing on the defects of surface (Fig. 3a, b)
and the initial iron-oxygen structure (Fig. 3c).
The absence of the Green Rust reflexes on the X-
ray patterns can be explained by its location on
the defects of steel surface (in the pittings) and its
relatively low concentration (lower than the limit
of sensitivity of X-ray diffraction).
a
b
c
Fig. 3 The localization of the centers of formation the
initial iron-oxygen structures on steel surface
due to its contact with cobalt hydroxide (a, b)
and initial iron-oxygen structure (c)
The Influence of the pH Value and the Cation Composition of Dispersion Medium on the Formation
_____________________________________________________________________________________________
ХФТП 2011. Т. 2. № 1 97
It should be noted that under experimental
conditions the structure of spinel ferrite can con-
tain ferrous iron as well as cobalt cations. But
the identity (similarity) of interplanar spacing of
magnetite and cobalt spinel ferrite makes it im-
possible to use X-ray diffraction to divide these
structures. Therefore to define the ratio Fe:Co in
the structure of spinel ferrite the X-ray fluores-
cence analysis was used which allowed us to
estimate the iron and cobalt content in the phase.
The influence of the cobalt concentration in dis-
persion medium on the chemical composition of
spinel ferrite was studied within a wide range of
CCo(II) (from 1 to 1000 mg/dm3). The results
show that in all the samples the cobalt to iron
ratio is of 7–13% to 93–87%, respectively. So,
by varying cobalt concentration in neutral dis-
persion medium, it is impossible to form
nanosized spinel ferrite particles containing dif-
ferent amounts of ferrous iron and cobalt. The
formation mechanism of spinel ferrites under
experimental conditions is described by the reac-
tions (4)–(6) related to the formation of magnet-
ite on steel surface contacting with aqueous so-
lution within pH range of 4.0-6.5 (in the bulk) or
by addition of ferrous iron into the system at
neutral dispersion medium [10].
The formation of the iron-oxygen struc-
tures on steel surface due to its contact with
aqueous solution of silver nitrate. Salt adding
into dispersion medium contacting with steel
leads to the formation of iron-oxygen phases
on its surface and can also lead to reducing
silver on the surface of iron oxides [16]. The
formation of surface iron-oxygen structures in
presence of AgNO3 in dispersion medium de-
pends on hydrolysis of silver characterized by
formation of silver oxide Ag2O and occurs at
pH values of 6.2 (CAg+=1 mol/dm3) and 8.2–11.2
(CAg+=0.01 mol/dm3) [15]. The partial solubil-
ity of silver oxide in aqueous results in exis-
tence of other forms of silver: Ag+, AgOH and
Ag(OH)2
- [17]. An investigation of the forma-
tion of the surface structures in presence of
silver was carried out for its cationic and hy-
droxide forms. As XRD-data show, in the pres-
ence of silver ions in dispersion medium the
phases of lepidocrocite and magnetite are formed
on steel surface after 1 hour of contact (Fig. 4a).
The intensity of the magnetite reflexes grows
faster than that of lepidocrocite but at the station-
ary state of the system it gets down (Fig. 4b).
a
b
c
d
Fig. 4. XRD-data of surface structures formed on steel
surface due to its contact with silver-containing
dispersion medium: a – pH=6.5 after 5 h of
contact of steel with solutions; b – pH=6,5 after
48 h; с – pH= 11.0 after 1 h; d – pH=11.0 after
70 h. Numbers correspond to the phases: 1 –
magnetite FeFe2O4, 2 – lepidocrocite γ-FeOOH;
3 – Green Rust I; 4 – goethite α-FeOOH; 5 –
iron Fe0
O.M. Lavrynenko, S.V. Netreba, V.A. Prokopenko, Ya.D. Korol
_____________________________________________________________________________________________
98 ХФТП 2011. Т. 2. № 1
a
b
c
Fig 5. The localization of the process of formation of
iron-oxygen structures on the surface defects
(a), steel surface (b), the structure of Green
Rust I (c)
Due to the interaction of the aqueous solu-
tion of silver hydroxide with steel surface,
XRD-pattern shows the reflexes of lepido-
crocite, goethite, and Green Rust I (Fig. 4c).
Interplanar spacing of Green Rust I allows us
to identify the structure obtained as hydroxy-
carbonate GR (CO3
2-) [18]. After 24 hours of
conducting the process on steel surface, the
phase of magnetite is identified with intensity
reaching a maximum at stationary state of the
system (70 hours). Figure 5 shows SEM-
images of the steel surface with areas where
the iron-oxygen structures appear.
The mechanism of formation of iron-
oxygen structures on steel surface, probably,
consists in the formation of ferrous hydroxide
and its transformation to the Fe(II)–Fe(III)
layered double hydroxides and then to phase
of lepidocrocite and magnetite:
2Fe + O
2 + 2H
2
O → 2Fe(OH)2;
6Fe(OH)
2
+ 0,5O2 + CO2 + 2H2O →
→FeII
4FeIII
2(OH)12CO3·2H2O;
4Fe2+ + 2Fe3+ + 12OH-
·+ CO3
2- + 2H2O →
→ FeII
4FeIII
2(OH)12CO3·2H2O;
FeII
4FeIII
2(OH)12CO3·2H2O + O2 →
→ 6γ-FeOOH + H2CO3 + 4H2O;
FeII
4FeIII
2(OH)12CO3·2H2O + 0,5O2 →
→2FeFe
2
O4 + H2CO3 + 7H2O;
2γFeOOH + Fe(OH)
2
↔ FeFe
2
O
4
+ 2H
2
O;
So, the optimum condition for the forma-
tion of magnetite particles on steel surface in
presence of silver ions is the neutral dispersion
medium and relatively low concentration of
silver (0.1–1 mg/dm3). Evidently the process
of the formation of lepidocrocite and magnet-
ite is connected with phase transformation of
the Fe(II)–Fe(III) LDH formed on steel sur-
face as initial structures.
CONCLUSIONS
The investigation of the formation of iron-
oxygen structures on steel surface due to its
contact with aqueous dispersion medium
within the pH range of 1.5 to 11.0 shows a de-
pendence of the phase composition on the
conditions of carrying out the process. So, in
acid dispersion medium on steel surface well
crystallized iron oxyhydroxide – lepidocrocite
The Influence of the pH Value and the Cation Composition of Dispersion Medium on the Formation
_____________________________________________________________________________________________
ХФТП 2011. Т. 2. № 1 99
is formed; in weak-acid and neutral medium
the main iron-oxide structure is magnetite. In
alkaline dispersion medium the surface struc-
tures of oxyhydroxides are lepidocrocite and
goethite characterized by weak crystallization.
An addition of cobalt cations into disper-
sion medium on steel surface leads mainly to
the formation of the structure of cobalt spinel
ferrite. The addition of cobalt hydroxide into
dispersion medium does not lead to the forma-
tion of spinel ferrite. The final products of
phase formation are weakly crystallized iron
oxyhydroxides.
The contact of steel surface with aqueous
solution of silver nitrate leads to the formation
of magnetite and in the presence of silver hy-
droxide, the typical surface structures are
weakly crystallized iron oxyhydroxides.
The results of the research allows us to de-
tect the optimum conditions for the formation
of the structure of lepidocrocite on steel sur-
face in acid dispersion medium and that of
magnetite in neutral dispersion medium in the
absence of cations in both cases. The cobalt
spinel ferrite is formed in the presence of co-
balt ions in neutral dispersion medium. All the
structures formed in alkaline dispersion me-
dium are weakly crystallized iron oxyhydrox-
ides.
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Received 01.02.2011, accepted 23.02.2011
Вплив величини pH і катіонного складу дисперсійного середовища
на утворення залізо-кисневих структур на поверхні сталі
О.М. Лавриненко, С.В. Нетреба, В.А. Прокопенко, Я.Д. Король
Інститут біоколоїдної хімії ім. Ф.Д. Овчаренка Національної академії наук України
бульв. Академіка Вернадського 42, Київ 03142, Україна, ibcc@ukrpost.ua
Черкаський національний університет ім. Б. Хмельницького
бульв. Шевченка 81, Черкаси 18031, Україна, king@cdu.edu.ua
Методом рентгенофазового аналізу in situ досліджено особливості формування залізо-кисневих структур
на поверхні сталі при її контакті з водним дисперсійним середовищем у широкому діапазоні значень рН та в
присутності кобальту і срібла. Показано, що добре окристалізовані структури феришпінелі – магнетиту і
фериту кобальту утворюються при нейтральних значеннях рН середовища. При контакті сталі з лужним
дисперсійним середовищем на поверхні у всіх випадках утворюються слабко окристалізовані оксигідроксиди
заліза. Структура лепідокрокіту утворюється на поверхні сталі при її контакті з кислим дисперсійним се-
редовищем за відсутності катіонів.
Влияние величины pH и катионного состава дисперсионной среды
на формирование железо-кислородных структур на поверхности стали
Е.Н. Лавриненко, С.В. Нетреба, В.А. Прокопенко, Я.Д. Король
Институт биоколлоидной химии им. Ф.Д. Овчаренко Национальной академии наук Украины
бульв. Академика Вернадского 42, Киев 03142, Украина, ibcc@ukrpost.ua
Черкасский национальный университет им. Б. Хмельницкого
бульв. Шевченко 81, Черкассы 18031, Украина, king@cdu.edu.ua
Методом рентгенофазового анализа in situ исследованы особенности формирования железо-кислородных
структур на поверхности стали при ее контакте с водной дисперсионной средой в широком диапазоне
значений рН и в присутствии кобальта и серебра. Показано, что хорошо окристаллизованные структуры
ферришпинели – магнетита и феррита кобальта формируются при нейтральных значениях рН среды.
При контакте стали со щелочной дисперсионной средой на поверхности во всех случаях образуются сла-
бо окристаллизованные оксигидроксиды железа. Структура лепидокрокита образуется на поверхности
стали при ее контакте с кислой дисперсионной средой в отсутствие катионов.
|
| id | nasplib_isofts_kiev_ua-123456789-29046 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 2079-1704 |
| language | English |
| last_indexed | 2025-12-07T19:05:44Z |
| publishDate | 2011 |
| publisher | Інститут хімії поверхні ім. О.О. Чуйка НАН України |
| record_format | dspace |
| spelling | Lavrynenko, O.M. Netreba, S.V. Prokopenko, V.A. Korol, Ya.D. 2011-11-29T18:38:29Z 2011-11-29T18:38:29Z 2011 The Influence of the pH Value and the Cation Composition of Dispersion Medium on the Formation of Iron-Oxygen Structures on Steel Surface / O.M. Lavrynenko, S.V. Netreba, V.A. Prokopenko, Ya.D. Korol // Хімія, фізика та технологія поверхні. — 2011. — Т. 2, № 1. — С. 93-100. — Бібліогр.: 18 назв. — англ. 2079-1704 https://nasplib.isofts.kiev.ua/handle/123456789/29046 543.442.2:549.057+544.77 The peculiarities of the formation of iron-oxygen structures on steel surface due to its contact with aqueous dispersion medium within a wide range of pH values and in presence of cobalt and silver have been studied by X-ray diffraction in situ. It has been shown that well crystallized cobalt- and ironcontaining spinel ferrites are formed at neutral pH value of aqueous medium. The contact of steel surface with alkaline medium results in formation of weakly crystallized iron oxyhydroxides. The structure of lepidocrocite is formed on steel surface due to its contact with acid dispersion medium in absence of metal ions such as cobalt and silver. Методом рентгенофазового аналізу in situ досліджено особливості формування залізо-кисневих структур на поверхні сталі при її контакті з водним дисперсійним середовищем у широкому діапазоні значень рН та в присутності кобальту і срібла. Показано, що добре окристалізовані структури феришпінелі – магнетиту і фериту кобальту утворюються при нейтральних значеннях рН середовища. При контакті сталі з лужним дисперсійним середовищем на поверхні у всіх випадках утворюються слабко окристалізовані оксигідроксиди заліза. Структура лепідокрокіту утворюється на поверхні сталі при її контакті з кислим дисперсійним середовищем за відсутності катіонів. Методом рентгенофазового анализа in situ исследованы особенности формирования железо-кислородных структур на поверхности стали при ее контакте с водной дисперсионной средой в широком диапазоне значений рН и в присутствии кобальта и серебра. Показано, что хорошо окристаллизованные структуры ферришпинели – магнетита и феррита кобальта формируются при нейтральных значениях рН среды. При контакте стали со щелочной дисперсионной средой на поверхности во всех случаях образуются слабо окристаллизованные оксигидроксиды железа. Структура лепидокрокита образуется на поверхности стали при ее контакте с кислой дисперсионной средой в отсутствие катионов. en Інститут хімії поверхні ім. О.О. Чуйка НАН України Хімія, фізика та технологія поверхні The Influence of the pH Value and the Cation Composition of Dispersion Medium on the Formation of Iron-Oxygen Structures on Steel Surface Вплив величини pH і катіонного складу дисперсійного середовища на утворення залізо-кисневих структур на поверхні сталі Влияние величины pH и катионного состава дисперсионной среды на формирование железо-кислородных структур на поверхности стали Article published earlier |
| spellingShingle | The Influence of the pH Value and the Cation Composition of Dispersion Medium on the Formation of Iron-Oxygen Structures on Steel Surface Lavrynenko, O.M. Netreba, S.V. Prokopenko, V.A. Korol, Ya.D. |
| title | The Influence of the pH Value and the Cation Composition of Dispersion Medium on the Formation of Iron-Oxygen Structures on Steel Surface |
| title_alt | Вплив величини pH і катіонного складу дисперсійного середовища на утворення залізо-кисневих структур на поверхні сталі Влияние величины pH и катионного состава дисперсионной среды на формирование железо-кислородных структур на поверхности стали |
| title_full | The Influence of the pH Value and the Cation Composition of Dispersion Medium on the Formation of Iron-Oxygen Structures on Steel Surface |
| title_fullStr | The Influence of the pH Value and the Cation Composition of Dispersion Medium on the Formation of Iron-Oxygen Structures on Steel Surface |
| title_full_unstemmed | The Influence of the pH Value and the Cation Composition of Dispersion Medium on the Formation of Iron-Oxygen Structures on Steel Surface |
| title_short | The Influence of the pH Value and the Cation Composition of Dispersion Medium on the Formation of Iron-Oxygen Structures on Steel Surface |
| title_sort | influence of the ph value and the cation composition of dispersion medium on the formation of iron-oxygen structures on steel surface |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/29046 |
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