船舶冷却系统铜镍合金管腐蚀穿孔原因
Causes of corrosion perforation of copper-nickel alloy tube in ship cooling system
摘 要
采用体视显微镜、金相显微镜、电子探针等分析测试方法对腐蚀穿孔失效的BFe10-1.6-1铜镍合金管进行失效分析。结果表明：失效管的内壁存在不同程度的划痕，且腐蚀坑内壁显微组织呈现“波纹”状，符合海水冲刷腐蚀的特征；腐蚀区的显微组织呈现“冰糖块”状，符合晶间腐蚀的特征；腐蚀坑内的泥沙沉积致使管道发生点蚀。结合船用铜镍合金管的使用工况，确认该失效管腐蚀穿孔失效的主要原因是海水冲刷腐蚀、晶间腐蚀及点蚀。
腐蚀穿孔
冲刷腐蚀
晶间腐蚀
点蚀
copper-nickel alloy
corrosion perforation
erosion corrosion
intercrystalline corrosion
pitting corrosion
Abstract
The failure analysis of BFe10-1.6-1 copper-nickel alloy tube with corrosion perforation failure was carried out by stereomicroscope, metallographic microscope and electronic probe. The results show that there were different degrees of scratches on the inner wall of the failure tube, and the microstructure of the inner wall of the corrosion pit was ‘ripple’, which was consistent with the characteristics of seawater erosion and corrosion. The microstructure of the corrosion zone was ‘ice sugar block’, which was consistent with the characteristics of intergranular corrosion. Sediment deposition in corrosion pits caused pitting of pipelines. Combined with the working conditions of marine copper-nickel alloy tube, it was confirmed that the main causes of corrosion perforation failure of the failure tube were seawater erosion corrosion, intergranular corrosion and pitting corrosion.
中图分类号 TG172.5 DOI 10.11973/lhjy-wl202202013
所属栏目 质量控制与失效分析
基金项目 广州市对外科技合作计划项目(201907010004)；中国博士后科学基金资助项目(2020M682929)；广东省科学院发展专项资金项目(2019GDASYL-0302009)
收稿日期 2021/2/4
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联系人作者李扬(46598199@qq.com)
备注石常亮(1981-)，男，博士，高级工程师，主要从事无损检测、失效分析、构件寿命预测、力学性能分析等方面的研究工作
引用该论文: SHI Changliang,ZHANG Xin,LI Yang,LI Yu,YANG Hongyan,SUN Daxiang. Causes of corrosion perforation of copper-nickel alloy tube in ship cooling system[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2022, 58(2): 53～57
石常亮,张欣,李扬,李雨,杨红燕,孙大翔. 船舶冷却系统铜镍合金管腐蚀穿孔原因[J]. 理化检验－物理分册, 2022, 58(2): 53～57
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【3】曹标, 谭莹, 李小敏.黄铜角阀开裂原因分析[J].理化检验(物理分册), 2017, 53(11):841-843, 847.
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【5】赵月红, 林乐耘, 崔大为.铜镍合金在我国实海海域的局部腐蚀[J].中国有色金属学报, 2005, 15(11):1786-1794.
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【11】HUANG X C, LU H, LI D Y. Understanding the corrosion behavior of isomorphous Cu-Ni alloy from its electron work function[J]. Materials Chemistry and Physics, 2016, 173:238-245.
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