TY - JOUR
T1 - Environment-friendly and chromium-free passivation of copper and its alloys
AU - Yang, Tao
AU - Chen, Wenge
AU - Li, Xin
AU - Song, Jiulong
AU - Dong, Longlong
AU - Fu, Yongqing (Richard)
N1 - Funding indormation: The authors would like to acknowledge the financial supports from Shaanxi Coal Industry Group United Fund of China (No. 2019JLM-2), Xi’an Science research project of China (No.2020KJRC0089) and Electrical Materials and Infiltration Key Laboratory of Shaanxi Province Projects (No.17JS080), and International Exchange Grant through Royal Society and National Science Foundation of China (IEC/NSFC/201078), China, Key Research and Development Projects of Shaanxi Province (No. 2019GY-164) and Science and Technology Project of Weiyang District of Xi’an City (No. 2018057).
PY - 2021/12/1
Y1 - 2021/12/1
N2 - 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.
AB - 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.
KW - Copper alloy
KW - chromium-free passivation
KW - characterization
KW - mechanism
KW - Characterization
KW - Chromium-free passivation
KW - Mechanism
UR - https://www.scopus.com/pages/publications/85122677570
U2 - 10.1016/j.mtcomm.2021.102826
DO - 10.1016/j.mtcomm.2021.102826
M3 - Article
SN - 2352-4928
VL - 29
JO - Materials Today Communications
JF - Materials Today Communications
M1 - 102826
ER -