期刊
APPLIED SURFACE SCIENCE
卷 440, 期 -, 页码 245-257出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2018.01.116
关键词
Cu-Ni-Zn alloy; Pitting; X-ray photoelectron spectroscopy; Scanning electrochemical microscopy; Laser confocal microscopy
类别
资金
- National Key Research and Development Program of China [2017YFB 0702300]
- National Natural Science Foundation of China [51671029]
- China Postdoctoral Science Foundation [2015 M581349]
The evolution of the corrosion process on Cu-Ni-Zn alloy in alkaline chloride solution was investigated by in-situ scanning electrochemical microscopy, X-ray photoelectron spectroscopy, and ex-situ laser confocal microscopy, and the effects of ambient temperature and polarization time were also discussed. The results demonstrated a higher pitting nucleation rate and lower pit growth rate at low temperature. The ratio of pit depth to mouth diameter decreased with increasing pit volume and temperature, indicating that pits preferentially propagate in the horizontal direction rather than the vertical direction owing to the presence of corrosion products and deposited copper. The surface current was uniform and stabilized at approximately 2.2 nA during the passive stage, whereas the current increased after the pits were formed with the maximum approaching 3 nA. Increasing the temperature led to an increase in porous corrosion products (CuO, Zn(OH)(2), and Ni(OH)(2)) and significantly increased the rate of transition from pitting to uniform corrosion. Dezincification corrosion was detected by energy dispersive spectrometry, and a mechanism for pitting transition into uniform corrosion induced by dezincification at the grain boundaries is proposed. (C) 2018 Elsevier B.V. All rights reserved.
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