激光熔覆制备CrNiAlCoMoB0．5高熵合金涂层的组织与耐腐蚀性能研究  

Microstructure and Corrosion Resistance Properties of CrNiAlCoMoB0.5 High Entropy Alloy Coating Prepared by Laser Cladding

作　　者：邹朋津 董刚[1,2] 王梁[1,2] 姚建华[1,2] 

机构地区：[1]浙江工业大学激光加工技术工程研究中心,浙江杭州310014 [2]浙江省高端激光制造装备协同创新中心,浙江杭州310014

出　　处：《中国激光》2015年第B09期117-123,共7页Chinese Journal of Lasers

基　　金：浙江省公益技术研究工业项目（2014C31122,2013C31012）

摘　　要：利用激光熔覆的方法在45钢基体上制备了CrNiAlCoMoB0.5高熵合金（HEA）涂层，研究了涂层组织结构及耐腐蚀性能。结果表明：涂层的耐腐蚀性良好；涂层在3．5%NaCl（质量分数）电解液中的腐蚀电位Ecorr和腐蚀电流Icorr与304不锈钢相当，耐点蚀能力优于304不锈钢，但是，涂层的钝化能力弱于304不锈钢；涂层在1mol／LH2SO4电解液中的Ecorr和Icorr与304不锈钢在同一个数量级，且相当接近，表现出良好的耐腐蚀性能，涂层主要发生晶间腐蚀，304不锈钢为不规则的片状腐蚀；涂层在1mol／LNaOH电解液中的Ecorr小于304不锈钢，其腐蚀倾向大于304不锈钢。同时涂层的Icorr小于304不锈钢的Icorr，即涂层的耐腐蚀性优于304不锈钢，且涂层钝化能力与304不锈钢相当。CrNiAICoMoB0.5high-entropy alloy （HEA） is prepared on 45 # steel bylaser cladding. The microstructure and corrosion resistance properties of this HEA coating are studied. The results show that the corrosion resistance properties of the HEA are remarkable, corrosion electric potential E and corrosion currect Icorr of CrNiAlCoMoB0.5 HEA are equal to those of 304 stainless steel in 3.5%NaCl （mass fraction） while the resistance to pitting is better. Compared with 304 stainless steel, the ability of passivating of HEA coating is weaker. In 1 mol/L H2 SO4 electrolytic solution, the Ecorr and Icorr of HEA coating and 304 stainless steel are in an order of magnitude, which means corrosion resistance of CrNiAlCoMoB0.5 coating is remarkable. Corrosion behavior of the HEA coating is intergranular corrosion while 304 stainless steel is irregular flake corrosion. In 1 mol/L NaOH electrolytic solution, E of CrNiAlCoMoB0.5 HEA coating is lower than that of 304 stainless steel, which shows that the tendency of corrosion is larger. Meanwhile, I of the HEA coating is smaller, the corrosion resistance of CrNiAlCoMoB0.5 HEA coating is better, and the ability of passivating is equal to that of the 304 stainless steel.

关 键 词：激光技术 激光熔覆 高熵合金涂层 极化曲线 耐腐蚀性 

分 类 号：TG146.4[一般工业技术—材料科学与工程]