Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 199, Issue -, Pages 54-66Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2017.06.041
Keywords
Alloy; Polarization; XPS; Thermo-mechanical treatments
Categories
Funding
- National Natural Science Foundation of China [51601227]
- National Key Research and Development Program of China [2016YFB0301300]
- China Postdoctorates Science Foundation [2016M590753]
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China
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The microstructure and corrosion behavior of the Cu-15Ni-8Sn-1.0Zn- 0.8A1-02Si alloy treated with different thermo-mechanical processes in 3.5 wt% NaCl solution was investigated by electrochemical test, electron microscopy and XPS analysis. Compared with single-stage thermo-mechanical treatment (cold rolling by 60% reduction and then aging at 450 degrees C for 0.5 h), the alloy with two-stage treatment (pre aging at 400 degrees C for 0.5 h, cold rolling by 60% reduction and then aging at 450 degrees C for 0.5 h) had finer ordered precipitates and less coarse, discontinuous precipitates, resulting in better corrosion resistance performance. The corrosion product layer was mainly a mixture of Cu2O, CuO, NiO, Ni(OH)(2), SnO, SnO2, ZnO and Al2O3, with a transition from Cu2O to CuO and Cu(OH)(2) occurring during the corrosion process. (C) 2017 Elsevier B.V. All rights reserved.
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