摘要
为研究Cu对低合金钢耐海水腐蚀性能的影响,选择含Cu低合金钢和碳钢各两种进行对比实验。利用室内间浸挂片、实海潮差区挂片和模拟闭塞腐蚀电池实验比较钢的耐全面腐蚀和点蚀能力;利用扫描电镜(SEM)、能谱分析(EDAX)、电子探针(EPMA)和X射线衍射(XRD)分析钢中夹杂物和锈层的特征。结果表明:Cu的添加不仅可提高钢的耐全面腐蚀性能,而且还可提高钢的耐点蚀性能。在宏观阴极区,Cu的添加可促进-αFeOOH的形成,从而提高锈层对基体的保护能力。在酸化蚀坑内,Cu可形成难溶盐,对锈层中的孔洞和裂纹有修复作用,从而增强钢的耐点蚀能力。
In order to understand the effect of Cu on sea water corrosion resistance of low alloy steels,two Cu-containing low alloy steels and carbon steels were selected.Their general and pitting corrosion resistance was evaluated by indoor interval hanging plate tests,marine tide hanging plate tests and simulating occluded corrosion cell tests.The composition of inclusions,corrosive feature and characteristics of rust layers were studied by scanning electron microscopy（SEM）,energy dispersive analysis of X-ray（EDAX）,electron probe micro-analyzer（EPMA） and X-ray diffraction（XRD）.The results indicate that general corrosion resistance and pitting corrosion resistance are enhanced by addition of Cu.In macro cathodic region,addition of Cu facilitates formation of α-FeOOH,and then improves protective ability of rust layer for matrix.In acidified pits,the insoluble salt that Cu formed can repair and fill the slots and holes in rust layers,which are effective in improving resistance to pitting corrosion.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2011年第9期62-67,共6页
Journal of Materials Engineering
关键词
CU
碳钢
海水腐蚀
锈层
Cu
carbon steel
sea water corrosion
rust layer
