1 Institute of Corrosion Science and Surface Technology, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001 2 Army Aviation Equipment Development Office, Beijing 100000 3 The 703 Research Institute of CSIC, Harbin 150078 4 Academy of Armored Force Engineering, National Key Laboratory for Remanufacturing, Beijing 100072
Scanning electronic microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), electro probe micro-analysis (EPMA), open-circuit potential and potentiodynamic polarization and X-ray photoelectron spectroscopy (XPS) were used to explore the corrosion mechanism and morphology of HSn62-1 brass in H2SO4 solution(pH=2),NaOH solution(pH=13) and NaCl solution(3.5%, mass fraction). The results indicated that there existed obvious weight loss in H2SO4 solution compare to NaOH solution and NaCl solution. Numerous corrosion products were detected except CuO and ZnO. The dezincification of HSn62-1 in H2SO4 solution can be explained as selective dissolution and its cathodic reactions were dominated by oxygen reduction and hydrogen reaction. In contrast, the dezincification mechanism was simultaneous dissolution of both zinc and copper and with the subsequent re-deposition of copper. Besides the cathodic reaction was hydrogen evolution corrosion in NaCl solution and oxygen evolution corrosion in NaOH solution.
图7 HSn62-1在3.5%(质量分数)NaCl溶液中的腐蚀形貌:(a)腐蚀6 h;(b)腐蚀30 h
图8 HSn62-1在NaCl溶液中的腐蚀产物的X射线光电子能谱分析
图9 HSn62-1浸泡在NaCl介质中30 h后的EPMA图
图10 HSn62-1在三种溶液中随时间变化的质量损失曲线
图11 HSn62-1在三种溶液中的动电位极化曲线
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2018, Vol. 32 
