Conferences

Anodic Oxidation of Alloys in the (α-Al–Mg2Si) Quasibinary Section of the Al–Mg–Si Ternary System in 3% NaCl Solution and Principle of Independence of Electrochemical Reactions

V.Lavrenko,
 
V.Lavrenko,
 
M.Krasovskiy,
  
T.M.Legka
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2011, #09/10
http://www.materials.kiev.ua/article/1469

Abstract

The paper studies the kinetics and mechanisms of anodic oxidation of aluminum alloys in the (α-Al–Mg2Si) quasibinary section of the Al–Mg–Si system in a 3% NaCl solution. According to the principle of independence of electrochemical reactions, the electrochemical processes in the case of two-phase alloys are shown to take place on each phase separately. On some areas of the surface, Аl2O3 is formed as a reaction product, while α-SiO2 is formed on the other areas. It is established that corrosion destruction of the eutectic structural component occurs at the early oxidation stages, while α-Al dendrites are uniformly dissolved with a dominating transition of Mg2+-ions into the solution. The alloys which have the minimum amount of the eutectic structural component possess the highest corrosion resistance.


ALUMINUM ALLOYS OF AL–MG–SI SYSTEM, CORROSION PRODUCTS, KINETICS AND MECHANISM OF ANODIC OXIDATION, PRINCIPLE OF INDEPENDENCE OF ELECTROCHEMICAL REACTIONS