Environment-friendly and chromium-free passivation of copper and its alloys

Yang, Tao, Chen, Wenge, Li, Xin, Song, Jiulong, Dong, Longlong and Fu, Richard (2021) Environment-friendly and chromium-free passivation of copper and its alloys. Materials Today Communications. ISSN 2352-4928 (In Press)

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Abstract

Benzotriazole (BTA) and tolyltriazole (TTA) were used to passivate pure copper and chromium bronze alloys for environmental protection. Using the chemical immersion treatment, a dense film of chromium-free passivation layer was formed on surfaces of both the pure copper and chromium bronze alloys. Microstructure, crystalline phases and chemical bonds of the passivation layers were systematically characterized, and the passivation mechanisms were studied. The passivation layer was mainly consisted of CuO, Cu2O, polymers of Cu-BTA-TTA and Cu(I)BTA-TTA. The formation mechanism of the chromium-free passivation layer was identified as combined oxidation and adsorption, and the main passivation processes included oxidation and dissolution of the matrix, adsorption of BTA and its derivatives, self-stabilization process of the adsorbed film, and filling of passivation film’s voids by oxide particles.

Item Type: Article
Uncontrolled Keywords: Copper alloy, chromium-free passivation, characterization, mechanism
Subjects: H800 Chemical, Process and Energy Engineering
H900 Others in Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 27 Sep 2021 13:31
Last Modified: 27 Sep 2021 13:45
URI: http://nrl.northumbria.ac.uk/id/eprint/47362

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