纳米高锰钢在海水腐蚀介质中的耐蚀性能研究

摘要

The corrosion performance of the original deformed and nanocrysatlline Hadfield steels in seawater was investigated using the electrochemical impedance spectroscopy EIS and polarization curves techniques. The microstructures and grain size distribution of the original and deformed Hadfield steels were determined by the optical microscopy and transmission electron micro⁃scope TEM . The surface morphology of the three types of steels subjected to the electrochemical corrosion in seawater was recorded by the scanning electron microscopy SEM . The results showed that corrosion resistance of the nanocrysatlline Hadfield steel is higher than the original and deformed ones and Cl- is responsible for the pitting corrosion in the Hadfield steels.%本文以原态高锰钢、变形高锰钢和纳米高锰钢为研究对象，采用极化曲线和电化学阻抗谱的方法研究其在海水腐蚀介质中的耐腐蚀性能，采用金相显微镜和透射电镜观察其表面组织及晶粒尺寸分布，利用扫描电子显微镜观察其分别在海水中电化学腐蚀后的表面形貌。结果表明，在海水腐蚀介质中，纳米高锰钢的耐蚀性高于原态高锰钢和变形高锰钢，Cl－是使高锰钢发生点蚀的破坏性离子。