摘要
本文用7种超纯铁素体不锈钢及其对比材质 Ni 板和奥氏体不锈钢 1 Cr18Ni9Ti,在内蒙古天然碱苛化烧碱蒸发完成液中,进行了动态和静态腐蚀实验。用失重法测定腐蚀速度,用扫描电镜和透射电镜观察试样表面的腐蚀形貌特征,并评定其耐蚀性等级。试验结果表明,高铬钼型和高铬钼镍型超纯铁素体不锈钢,在内蒙古天然碱苛化烧碱蒸发完成液中有很好的耐蚀性能,其耐蚀等级比1 Cr18Ni9Ti钢优越很多,用 Cr30Mo2钢钢和 Cr26Mo 钢代替目前广泛使用的1 Cr18Ni9Ti 钢制造蒸发器换热管,使用寿命有可能大幅度提高。
In this paper,a static and dynamic corrosion test is carried out with seven superpurity ferritic stainless steels,immersed in Inner-Mongolian natural soda,contrast material being nickel and austenite stainless steel 1Cr18Ni9Ti.The corrosion speed is determined by a loss-in-weight tester The corrosive shape is observed by SEM and TEM and the corrosion resis- tance of the tested material is graded.The result shows that both high- chromium-molybdenum and superpurity high-chromium-molybdenum-nickel ferritic stainless steels have a significant corrosion resistance when they are immersed in Inner-Mongolian natural soda.Their corrosion resistance grade is greatly superior to 1Cr18Ni9Ti.Service life of the equipment may be significantly lengthened if the heat-exchange trunk of the evapora- tor is made of Cr30Mo2 and Cr26Mo instead of 1Cr18Ni9Ti,which is widely used at present.
关键词
不锈钢
天然碱
苛化烧碱
铁素体
metallic corrosion
anticorrosion
ferritic stainless steel
natural soda
caustic soda
