摘要
利用极化曲线、交流电化学阻抗谱、X光电子能谱和浸泡测试等方法,研究了201和316不锈钢在甲基磺酸溶液中的腐蚀行为及机理.结果表明:在甲基磺酸溶液中,316不锈钢的耐蚀性良好,而201不锈钢在开路电位下耐蚀性较差,只有在溶液具有较强氧化性时才有较好的耐蚀性;201不锈钢在开路电位下形成的钝化膜具有多孔结构,这使得该不锈钢基体的耐蚀性较差,但在腐蚀电位提高后,钝化膜由多孔结构向致密结构转变,其耐蚀性得到提升;316不锈钢在甲基磺酸溶液中会形成致密钝化膜,钝化膜中Cr和Mo的含量对不锈钢的耐蚀性具有重要影响.该研究结果表明:316不锈钢可用做甲基磺酸储运器皿和浸出搅拌桨的材料,而201不锈钢不适用于上述应用.
The corrosion behavior and mechanism of 201 and 316 stainless steel in methanesulfonic acid solution is studied by potentiodynamic,electrochemical impedance spectroscopy,X-ray electron spectroscopy and immersion tests.The results show that 316 stainless steel has high corrosion resistance in methanesulfonic acid solution,while 201 stainless steel has poor corrosion resistance under open-circuit potential conditions and high corrosion resistance only when the solution has strong oxidizing conditions.The passivation film formed by 201 stainless steel at open circuit potential has a porous structure with poor corrosion protection.When the corrosion potential is increased,the passivation layer formed on 201 stainless steel transfers from porous to compact structure to improve its corrosion resistance.The passive film formed on 316 stainless steel is compact with high corrosion resistance.316 stainless steel can be used as methanesulfonic acid storage and leaching stirring paddles,while 201 stainless steel is not suitable for these applications.
作者
吴忠雲
王伟
路殿坤
谢锋
Wu Zhongyun;Wang Wei;Lu Diankun;Xie Feng(School of Metallurgy,Northeastern University,Shenyang 110819,China)
出处
《材料与冶金学报》
CAS
北大核心
2024年第3期226-233,300,共9页
Journal of Materials and Metallurgy
基金
国家重点研发计划项目(2019YFC1908303)
沈阳市中青年科技创新人才支持计划项目(RC210406)
中央高校基本科研业务费项目(N2225017).
关键词
不锈钢
腐蚀
甲基磺酸
钝化膜
stainless steel
corrosion
methanesulfonic acid
passive films
