稀土镍铜合金铸铁耐碱腐蚀性能研究.pdfVIP

维普资讯 学兔兔 铸 造 May2008 · 494 · FOUNDRY Vo1．57 No．5 稀土镍铜合金铸铁耐碱腐蚀性能研究 乌日根 一，董俊慧 ，王玉荣 ，张 毅 (1．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．包头职业技术学院材料工程系，内蒙古包头014030) 摘要：采用动态失重法测定稀土镍铜合金铸铁在高温浓碱液中的腐蚀速度，借助光学显微镜和扫描电镜观察显微组织 和表面腐蚀形貌，利用能谱仪分析表面微区成分。结果表明：高温浓碱中的动态腐蚀条件下，稀土含量为0．05％的试样 耐碱蚀性相对较好，其微观腐蚀表面呈现出平坦、基体面积大和凸起碳化物量少的特点；稀土镍铜合金铸铁的碱腐蚀 属于均匀腐蚀，其耐蚀性主要取决于石墨和碳化物的数量、大小和分布；微观基体上富集的镍和铜有利于提高该区域 的耐蚀性。 关键词：稀土；合金铸铁；组织；耐碱蚀 中图分类号：TG143．9 文献标识码：A 文章编号：1001—4977(2008)05—0494—04 Caustic Corrosion Resistance of RE-·N i-·Cu Alloy Cast I ron WU Ri-gen’一，DONG Jun—hui’，WANG Yu—rong ，ZHANG Yi (1．College of Materials Science and Engineering，Inner Mongolia University of Technology，Huhhot 1 00062，Inner Mongolia，China；2．Material Engineering Department，Baotou Vocational Technical College，Baotou 01 4030，Inner Mongolia，China) Abstract：The corrosion rates of RE-Ni-Cu alloy cast irons in hot concentrated alkaline solution were measured by using dynamic condition hydrometer method：the microstructures and surface corrosion morphology of alloy cast irons were obsewed by means of the optical microscope and SEM：the composition was analyzed using XES．Experimental results showed that the corrosion resistance of the alloy cast iron with 0．05％ RE iS be~er。and its etched surface iS flat with bigger area of matrix and Iess quantity of bellied carbide．The caustic corrosion of Re—Ni—Cu alloy cast irons iS uniform corrosion。which mainly Iies on the quantity．dimension and distribution of the graphite and carb