耐海水腐蚀球墨铸铁成分优化设计及其抗蚀性能  

Chemical Composition Optimization and Sea Water Corrosion Resistance of a Ductile Cast Iron

作　　者：崔君军[1,2] 张雅静[1] 王琳琳[1] 陈晓刚 张国志[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110819 [2]沈阳工学院机械与运载学院,抚顺113122 [3]铁岭阀门(集团)特种阀门有限责任公司,铁岭112616

出　　处：《中国腐蚀与防护学报》2014年第6期537-543,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：辽宁省工业攻关项目(2011221005);东北大学基本科研业务费项目(N110302005)资助

摘　　要：在不改变耐海水腐蚀球墨铸铁基本元素C,Si,Mn,Cu和Al含量前提下,设计了不同Cr和Ni含量的合金系,采用金相观察、硬度测试、失重法测试、EPMA面扫描分析和极化曲线分析等手段研究了其切削性能和耐海水腐蚀的影响规律,获得了一种耐海水腐蚀球墨铸铁的优化成分。结果表明:Cr,Cu和Si等在材料表面形成一层薄且紧密附着的钝化膜,有利于提高合金铸铁的耐蚀性;Ni可以提高腐蚀过程中基体的电极电位,明显降低球墨铸铁腐蚀电流密度,降低腐蚀速率;当Cr含量为0.6%~0.8%(质量分数)时,既可以保证切削性能,又能提高耐蚀性。与普通的球墨铸铁相比,成分优化设计的球墨铸铁的耐蚀性明显提高。Without changing the content of the alloying elements C, Si, Mn, Cu and Al in an ordinary ductile cast iron, of which the influence of the addition of Cr and Ni on the microstructure, mechanical performance and the sea water corrosion resistance was studied by means of metallography observation, hardness and cutting test, weight loss test and polarization curve measurement in sea water, as well as surface EPMA analysis for the corrosion products. Accordingly an optimal chemical composition of that cast iron was acquired. The results showed that elements Cr, Cu and Al are beneficial to the formation of a thin and tightly adherent passive film on the surface, which can enhance the corrosion resistance of the alloyed cast iron. Element Ni can positively rises the corrosion potential and significantly reduce corrosion current density of the alloyed cast iron. As a comprehensive result, the alloyed cast iron with Cr content 0.6%~0.8%(mass fraction) exhibits not only better cutting performance, but also superior corrosion resistance in comparison with the ordinary ductile cast iron.

关 键 词：球墨铸铁 海水腐蚀 成分设计 耐蚀性 切削性能 

分 类 号：TG143.5[一般工业技术—材料科学与工程]