ДОСЛІДЖЕННЯ ПРОЦЕСУ ЕЛЕКТРОХІМІЧНОГО ОСАДЖЕННЯ ХРОМУ В ПРИСУТНОСТІ КОМПОЗИЦІЙНОГО АЛМАЗОВМІЩУЮЧОГО СКЛАДУ

• Date: 2020
• Main Authors: Долматов, В. Ю., Буркат, Г. К., Єврєінова, Н. В., Свір, К. А., Марчуков, В. О., Дорохов, О. О., Мюллюмакі, В., Веханен, А., Козлов, А. С., Алмазова, Н. С.
• Format: Article
• Language: Russian
• Published: Институт сверхтвердых материалов им. В. Н. Бакуля Национальной академии наук Украины 2020
• Subjects: хромування; детонаційні наноалмази; композиційний алмазосодержащих склад; мікротвердість; зносостійкість; вихід за струмом; коефіцієнт тертя
• Online Access: http://altis-ism.org.ua/index.php/ALTIS/article/view/174
• Journal Title: Tooling materials science

The purpose of the study is to develop a method for producing a high-quality electrochemical chromium coating using a new type of diamond-containing additive, which has significant advantages over traditionally used detonation nanodiamonds (DNDs) in the form of aqueous suspensions. As an additive, a powdered composite diamond-containing compound was developed and used, consisting of detonation nanodiamond (DND), alkaline agent (NaHCO3) and acid agent (citric acid). The composition contains 62.5 wt. % of DND. A standard chromium electrolyte was used: CrO3 - 250 g / l, H2SO4 - 2.5 g / l, DND – 0.1 to 5 g / l, traditional methodologies and the algorithm of the experiment was applied. The scope of the study is limited to the creation and application of a specific, easy-to-use and prepare DND composition. Modified DND (MDND) can be added to the standard chromium electrolyte directly or in the form of a freshly prepared aqueous suspension, it is environmentally friendly. A significant increase in the current yield of chromium by ~ 5% was achieved. The originality of the work lies in combining the “inert” nanodiamond and active alkaline and acid components in the diamond-containing composition, which work only when introduced into the aquatic environment and provide the necessary disaggregation and stability of DND suspensions. An increase in microhardness of wear-resistant chromium coating by 1.3 times (up to 9.6 GPa) and hard chromium coating by 1.6 times (up to 13.6 GPa) were achieved. The wear resistance of the resulting coatings increased by 2 times. Concentration (based on pure DND) from 1 to 5 g / l in the electrolyte.