稀土对镍铜合金铸铁耐烧碱腐蚀性能的影响.pdfVIP

学兔兔 Dec．2O08 铸 造 VoJ．57 NO．12 FOUNDRY ·1275· 稀土对镍铜合金铸铁耐烧碱腐蚀性能的影响 张 毅 一，董俊慧 ，鸟日根 (I 内蒙古工业大学材料科学与工程学院，内蒙古呼和浩特010062；2．包头职业技术学院，内蒙古包头014030) 摘要：针对天然碱制碱工业中设备的腐蚀问题，研制出4种成分的稀土镍铜合金铸铁，进行金相组织分析，利用自制的 动态腐蚀试验装置模拟碱腐蚀条件，测试其腐蚀速度，并对耐碱腐蚀性能进行评价。借助扫描电镜对镍铜合金铸铁的表 面腐蚀形貌和微区成分分析，详细地讨论了稀土在铸铁中的作用与耐蚀机理。结果表明：稀土镍铜合金铸铁在高温浓烧 碱液中宏观上属于全面腐蚀，微观上存在不同程度的镍、铜元素富集。加入适量的稀土，可以减小合金铸铁在烧碱液中 的腐蚀速度，有效的改善合金铸铁的耐碱腐蚀性能。但是稀土加入过量会造成合金铸铁的耐碱腐蚀性能的下降。 关键词：稀土；镍；铜；合金铸铁；腐蚀性能 中图分类号：TG143．9 文献标识码：A 文章编号：1001—4977(2008)12—1275—05 Effect of RE on Soda Corrosion Resistance of N i-·Cu Alloy Cast I ron ZHANG Yi’一，DONG Jun-hui’，WU Ri—gen (1．College of Materials Science and Engineering I nner Mongolia University of Technology， Huhhot 01 0062，Inner Mongolia，China；2．Department of Materials Engineering Baotou Vocational Technical College，Baotou 01 4030，Inner Mongolia，China) Abstract：Four types of RE．Ni．CU cast iron were developed to solve the corrosion problem in caustic soda industry．The corrosion rate was tested by the self-made dynamic corrosion experiment equipment which simulated the soda corrosion condition on the basis of organic analyzing．RE。S action and corrosion resistant mechanism were discussed through analyzing surface corrosion appearance and components bv SEM．The results showed that RE-Ni-CU cast irol l is generaI corroded macroscopically in the dense caustic soda at high temperature and there is Ni—Cu enrichment microcosmically．The corrosion rate of Ni—Cu cast Iron can be reduced by addition of RE and the soda corrosion resistance can also be improved effectively．However．the property