Electrochemical and Exfoliation Corrosion Behavior of Reversion-Treated High-Strength Aluminum Alloy

Nandana, MS and Bhat, KU and Manjunatha, CM and Arya, SB (2020) Electrochemical and Exfoliation Corrosion Behavior of Reversion-Treated High-Strength Aluminum Alloy. Transactions of the Indian Institute of Metals, 73 (6). pp. 1489-1495. ISSN 09722815

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Abstract

The present study aims to understand the microstructural modification affecting the electrochemical and exfoliation corrosion (EXCO) characteristics of alu- minum alloy 7010. The alloy was aged for two different tempers, namely peak aging (T6) and retrogression and re- aging (RRA). The standard electrochemical polarization tests and EXCO tests were performed on the treated alloys. The microstructure of the alloy observed under a scanning transmission electron microscope revealed the presence of continuous grain boundary precipitates in T6 alloy. These precipitates were formed discontinuously after RRA treat- ment. The RRA alloy microstructure resulted in a shift toward positive potential. The exfoliation corrosion depth was reduced to 60–70 lm after RRA treatment, which was measured to be about 250 lm in T6 condition. The resis- tance toward the exfoliation corrosion was found to be influenced by the enriched Cu content of precipitates on grain boundary after reversion treatment. The results con- firm that the RRA-tempered alloy improves both electro- chemical corrosion and EXCO resistance.

Item Type:	Article
Subjects:	CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User:	Smt Bhagya Rekha KA
Date Deposited:	18 Aug 2021 11:41
Last Modified:	18 Aug 2021 11:41
URI:	http://nal-ir.nal.res.in/id/eprint/13453

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