不锈钢堆焊层在Cl-溶液中的腐蚀性能研究
Corrosion Property of Stainless Steel Surfacing Layer in Chloride Solution
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摘要: 采用浸泡腐蚀试验方法，研究了不锈钢堆焊层材料在Cl-溶液中的腐蚀情况，并通过金相显微镜、扫描电子显微镜、能谱分析观察表面形貌。研究表明，室温条件下堆焊层材料未发生任何腐蚀。在高温条件下，Cl-的存在诱导了点腐蚀的发生，且随着Cl-浓度的增加，点腐蚀加剧；较高浓度的Cl-可导致缝隙内金属元素Cr的流失，缝隙腐蚀加深；应力腐蚀裂纹有沿晶开裂的特征，应力腐蚀敏感性随Cl-浓度的增加有提高的趋势。Abstract: The corrosion properties of stainless steel surfacing layer in chloride solution were investigated using immersion corrosion test. The morphology of corrosion surfaces was inspected by using metallography, scanning electron microscopy (SEM) and energy dispersive spectrum (EDS). The results indicate that no evidence of corrosion on stainless steel surfacing layer is found at room temperature condition. In the condition of high temperature, the pitting corrosion is induced by Cl- and the corrosion increases with Cl- concentration. The lack of Cr on the surface of metal is resulted from the high Cl- concentration in crevice solution, then the crevice corrosion increases. The susceptibility to stress corrosion cracking (SCC) of the stainless steel increases with Cl- concentration, and the SCC exhibits the character of intergranular crack.
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Keywords:
- corrosion ,
- surfacing layer ,
- pitting corrosion ,
- crevice corrosion ,
- stress corrosion cracking
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