Microstructure inhomogeneity of the constituent particles of 7075-T6 aluminum alloy after alkaline cleaning and desmutting

被引：17
|
作者：
Chen, Siao-Ying [1 ]
Huang, Chao-Yu [1 ]
Lin, Chao-Sung [1 ]
机构：
[1] Natl Taiwan Univ, Dept Mat Sci & Engn, 1 Roosevelt Rd,Sect 4, Taipei 106, Taiwan
来源：
CORROSION SCIENCE | 2021年 / 184卷
关键词：
Aluminum; AES; TEM; Acidic corrosion; Alkaline corrosion; De-alloying; 2024-T3 CORROSION METROLOGY; LASER-SCANNING MICROSCOPY; LOCALIZED CORROSION; INTERMETALLIC PHASES; CONVERSION COATINGS; PITTING CORROSION; OXIDE FILM; FE-RICH; MECHANISM; BEHAVIOR;
D O I：
10.1016/j.corsci.2021.109354
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructural evolution of AA7075-T6 aluminum alloy during alkaline cleaning in NaOH solution and desmutting in HNO3 solution was studied. AA7075-T6 contained micro-sized Mg-Si and Al-Fe-Cu constituent particles. After desmutting, Mg-Si particles transformed to Si-O particles, leaving gaps with the aluminum matrix. The aluminum matrix nearby Al-Fe-Cu particles suffered slight trenching corrosion; meanwhile, the corrosion of Al-Fe-Cu particles varied from slight corrosion, dealloying, and nano-scale galvanic corrosion induced by re-deposited Cu particulates. After alkaline cleaning and desmutting, the microstructure of constituent particles was inhomogeneous although a uniform, 5 similar to 15-nm-thick Al oxide/hydroxide film covered the aluminum matrix.
引用
收藏
页数：16
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