ВПЛИВ ЗВАРЮВАННЯ ТЕРТЯМ З ПЕРЕМІШУВАННЯМ НА КОРОЗІЙНУ СТІЙКІСТЬ ВИСОКОМІЦНИХ АЛЮМІНІЕВИХ СПЛАВІВ

• Datum: 2019
• Hauptverfasser: Гнатенко, І.О., Олійник, Н.О., Ільницька, Г.Д., Лукаш, В.А., Майстренко, А.Л., Базалій, Г.А., Заболотний, С.Д.
• Format: Artikel
• Sprache: Ukrainian
• Veröffentlicht: Институт сверхтвердых материалов им. В. Н. Бакуля Национальной академии наук Украины 2019
• Schlagworte: зварювання тертям з перемішуванням; корозійна стійкість; міжкристалітна корозія; розшаровуюча корозія; високоміцні алюмінієві сплави
• Online Zugang: http://altis-ism.org.ua/index.php/ALTIS/article/view/120
• Назва журналу: Tooling materials science

Modern requirements for structural materials include an increase in performance and the possibility of using modern technologies of welded joints. The results of the study of the influence of friction stir welding on the corrosion resistance of high-strength aluminum alloys of systems: Al-Li (2099); Аl-Cu-Mg (2219); Al-Zn-Cu (7075) are given in the work. The microstructure of the material was examined using an MIM-8M optical microscope at × 225 magnification and photographed using a video eyepiece camera. Grain size was calculated by the section method. Sample preparation for the study was performed using sodium hydroxide solution and nitric acid solution. Tests of sample resistance to intergranular corrosion were carried out in an aqueous solution of sodium chloride and hydrochloric acid. Testing of the resistance of samples to exfoliating corrosion was performed using an aqueous solution of sodium chloride, potassium dichromate, potassium nitrate, nitric acid. It was found that alloys 2099, 7075 and 2219 are less susceptible to exfoliating corrosion than intergranular. In a series of reducing corrosion resistance to intergranular corrosion, the alloys can be placed as follows: 2099(max)>7075>2219(min). After welding, the corrosion resistance of the alloys is reduced. By the example of alloy 2219, it was shown that as a result of friction stir welding, a structure different from that of the original alloy is created. The structure consists of three zones: a welded joint zone, a transition zone, a heat-affected zone. In the zone of the welded joint, the grain of the alloy is crushed, the grain size of the alloy is reduced by a factor of 10, from 150 μm to 15 μm. Keywords: friction stir welding, corrosion resistance, intergranular corrosion, exfoliating corrosion, high-strength aluminum alloys.