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研究了超低碳高铬钢与低碳高铬钢的周期浸润(2%Na Cl水溶液)腐蚀性能和组织形貌,并与工业生产Q235碳钢进行了相应的比较。通过光学显微镜OM、扫描电镜SEM、高分辨透射电镜TEM、XRD射线衍射仪等观察与测试。结果表明:超低碳高铬钢和低碳高铬钢具有优异的耐氯离子腐蚀性能,其腐蚀速率相比Q235分别为21.25%、24.9%,超低碳高铬钢的耐蚀性优于低碳高铬钢,显微组织为板条马氏体和残留奥氏体的高铬钢的耐蚀性优于显微组织为铁素体+珠光体的Q235碳钢。高铬、低碳、马氏体+相间分布的残留奥氏体共同作用提高了高铬钢的耐腐蚀性能。
The corrosion behavior and microstructure of periodic infiltration (2% NaCl aqueous solution) of ultra-low carbon high chromium steel and low carbon high chromium steel were investigated and compared with that of industrial Q235 carbon steel. By optical microscope OM, SEM, high-resolution transmission electron microscopy TEM, XRD diffraction and other observations and tests. The results show that ultra-low carbon high-chromium steel and low-carbon high-chromium steel have excellent resistance to chloride ion corrosion, the corrosion rate compared with Q235 were 21.25% and 24.9%, respectively, and the corrosion resistance of ultra- Low-carbon high-chromium steel, microstructure lath martensite and retained austenite high-chromium steel corrosion resistance is better than the microstructure of ferrite + pearlite Q235 carbon steel. High chromium, low carbon, martensite + phase retained austenite together to improve the high chromium steel corrosion resistance.