ANODIC OXIDATION OF ALLOYS IN THE (alpha-Al-Mg2Si) QUASIBINARY SECTION OF THE Al-Mg-Si TERNARY SYSTEM IN 3% NaCl SOLUTION AND PRINCIPLE OF INDEPENDENCE OF ELECTROCHEMICAL REACTIONS

作者：Lavrenko V A^*; Krasovskii M A; Korzhova N P; Legkaya T N

来源：Powder Metallurgy and Metal Ceramics, 2012, 50(9-10): 655-661.

• aluminum alloys of Al-Mg-Si system
• kinetics and mechanism of anodic oxidation
• corrosion products
• principle of independence of electrochemical reactions

The paper studies the kinetics and mechanisms of anodic oxidation of aluminum alloys in the quasibinary section (alpha-Al-Mg2Si) of the Al-Mg-Si system in a 3% NaCl solution. According to the principle of independence of reactions, the electrochemical processes in two-phase alloys are shown to take place on each phase separately. On some areas of the surface, Al2O3 is formed as a reaction product, while alpha-SiO2 is formed on the other areas. It is established that the corrosion of the eutectic component occurs at the early oxidation stages, while alpha-Al dendrites are uniformly dissolved with a dominating transition of Mg2+ ions into the solution. The alloys that have the minimum amount of the eutectic component exhibit the highest corrosion resistance.

• 出版日期2012-1