摘要
采用扫描开尔文力显微镜(SKPFM)对镍铝青铜(NAB)、高锰铝青铜(MAB)及锰黄铜(MB)中不同相的稳定性进行表征,并对3种铜合金在不同pH值3.5%NaCl溶液中的选相腐蚀及空蚀行为进行研究。结果显示,在酸性溶液(pH 2)中,每种材料中稳定性最差的κ相均发生溶解。在中性溶液(pH 6.8)中,NAB中富Al的κ相未发生腐蚀,而MAB和MB中富Fe的κ相发生溶解。在碱性溶液(pH 12)中,点蚀发生在MAB和MB的κ相以及NAB中的κⅡ相上。在任一溶液中,耐空蚀性能顺序均为:NAB>MAB>MB。在酸性溶液中,选相腐蚀显著加重空蚀损伤,且腐蚀-空蚀交互作用是导致空蚀的主导因素;在其他溶液中,选相腐蚀较为轻微,3种铜合金均表现出以力学损伤为主导的空蚀损伤机制。
The stability of each phase in nickel aluminum bronze(NAB),manganese aluminum bronze(MAB)and manganese brass(MB)was characterized by scanning Kelvin probe force microscopy(SKPFM).Selective phase corrosion(SPC)and cavitation erosion(CE)behaviors of these materials were studied in 3.5%NaCl solution with different pH values.The results show that theκphase with the lowest stability is dissolved in the acidic solution(pH 2)for each material.In the neutral solution(pH 6.8),the Al-abundantκphases in NAB are preserved,whereas the Fe-richκphases in MAB and MB are dissolved.In the alkaline solution(pH 12),pitting corrosion occurs at theκphases in MAB and MB and at theκII phase in NAB.In each solution,NAB possesses the highest CE resistance,followed by MAB and MB.In the acidic solution,SPC remarkably intensifies the CE damage and CE−corrosion synergy contributes largely to the CE degradation.In other solutions,slight SPC occurs and each material exhibits a mechanical attackdominated CE mechanism.
作者
宋亓宁
李慧琳
许楠
蒋镇宇
张根元
包晔峰
蒋永锋
赵立娟
姬翠翠
赵建华
乔岩欣
Qi-ning SONG;Hui-lin LI;Nan XU;Zhen-yu JIANG;Gen-yuan ZHANG;Ye-feng BAO;Yong-feng JIANG;Li-juan ZHAO;Cui-cui JI;Jian-hua ZHAO;Yan-xin QIAO(College of Mechanical and Electrical Engineering,Hohai University,Changzhou 213022,China;College of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China)
基金
financially supported by the Natural Science Foundation of Jiangsu Province,China(No.BK20191161)
the Fundamental Research Funds for the Central Universities of China(No.B210202129)
the National Natural Science Foundation of China(Nos.51601058,51879089)
Changzhou Sci&Tech Program,China(No.CJ20210154)
Postgraduate Research and Innovation Project of Jiangsu Province,China(No.KYCX22_0599)。
关键词
铜合金
扫描开尔文力显微镜
选相腐蚀
空蚀
交互作用
copper alloys
scanning Kelvin probe force microscopy
selective phase corrosion
cavitation erosion
synergy
