铜镍合金铸铁耐碱腐蚀性能研究  

Research on the Caustic Corrosion Resistance of Copper-nickel Alloy Cast Iron

作　　者：乌日根[1] 董俊慧[1] 朱霞[1] 

机构地区：[1]内蒙古工业大学材料科学与工程学院

出　　处：《铸造》2006年第12期1235-1238,共4页Foundry

基　　金：国家自然科学基金项目(50361004);内蒙古高等学校科研重点领域项目(ZL01011)

摘　　要：采用动态失重法测定铜镍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,微观基体上富集的铜和镍有利于提高铜镍合金铸铁的耐蚀性,在高温浓碱液中的动态腐蚀条件下,铜含量为4.5%的D3试样耐碱蚀性较好。当铜含量超过一定值时,铜镍合金铸铁中析出游离铜相,这些新相成为活性阴极相,降低铸铁的耐蚀性。The corrosion rates of Cu -Ni alloy cast irons in hot concentrated alkaline solution were measured by dynamic condition hydrometer method, the microscopic structures and surface corrosion topographies of alloy cast irons were observed by the optical microscope and SEM, the components were analyzed by XES. Experimental results showed that the enrichment zones of Cu and Ni elements in microscopic matrix are advantageous to the improvement caustic corrosion resistances of Cu-Ni alloy cast irons, under the hot concentrated alkaline solution dynamic condition, the corrosion resistance of alloy cast iron with 4.5%Cu （ D3 ） is better. When Cu content exceeds the certain value, free Cu element is precipitated in Cu -Ni alloy cast irons, and these new phase become active cathode phase, thus reduce the corrosion resistances of alloy cast irons.

关 键 词：铜镍合金 合金铸铁 显微组织 耐碱蚀 

分 类 号：TG174.2[金属学及工艺—金属表面处理]