Journal
CORROSION SCIENCE
Volume 184, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109354
Keywords
Aluminum; AES; TEM; Acidic corrosion; Alkaline corrosion; De-alloying
Funding
- Ministry of Science and Technology, Taiwan [MOST 106-2622-8-006-001]
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The microstructural evolution of AA7075-T6 aluminum alloy during alkaline cleaning and desmutting processes reveals that Mg-Si particles transform to Si-O particles, leaving gaps with the aluminum matrix. Corrosion of Al-Fe-Cu particles varied from slight corrosion to dealloying and nano-scale galvanic corrosion induced by re-deposited Cu particulates. The microstructure of constituent particles becomes inhomogeneous after alkaline cleaning and desmutting, despite the presence of a uniform Al oxide/hydroxide film covering the aluminum matrix.
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.
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