锌锭模表面铬硼合金化的抗腐蚀性和机理  

Corrosion Resistance and Mechanism of Chromium Boron Alloying Surface on Zinc Ingot Mould

作　　者：徐若瑜[1] 卢德宏[1] 贺小刚[1] 熊艳春[1] 蒋业华[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《热加工工艺》2013年第14期64-66,70,共4页Hot Working Technology

摘　　要：采用铸渗方法制备出以灰铸铁为基材,以铬铁和硼铁作为合金化表面层的材料。通过失重法、金相分析、SEM和EDS等手段研究了该材料表面的耐锌液腐蚀性能,探讨了其腐蚀机理。结果表明,合金化表面的Cr是以高铬碳化物的形式块状分布在莱氏体基体上,Cr的存在使铁锌合金δ相的稳定性提高,且铁锌扩散受到阻挡;莱氏体对锌液基本不润湿,降低了锌液对基体的润湿能力。以上两个因素共同作用,使得铬铁硼铁合金化表面的耐液态锌腐蚀性能得到很大提高,其抗锌液腐蚀的能力比灰铸铁提高了8倍。By infiltration casting technology, the material was prepared by using gray cast iron as backing material, chromium iron and boron iron as alloying surface. By mass loss method, metaUographie analysis, SEM observation and EDS analysis, the corrosion resistance of the material surface was studied in liquid zinc. The corrosion mechanism of the material was discussed. The results show that, in the surface alloying, Cr is in high chromium compound form in block distribution in ledeburite matrix. The existence of Cr can improve the stability of iron zinc alloy δ phase. Iron and zinc was diffused by blocking; Ledeburite does not infiltrate zinc liquid basically, so the ability of zinc liquid infiltrating matrix is reduced. Above two factors, the corrosion resistance of the alloying surface in liquid zinc is greatly improved, which is 8 times higher than that of the gray cast iron

关 键 词：表面合金化 液态锌 腐蚀 机理 

分 类 号：TG174.4[金属学及工艺—金属表面处理]