扩渗时间对纯镁表面热扩渗锌层组织与性能的影响  

Effect of diffusion time on microstructure and properties of zinc coating on pure magnesium

作　　者：徐春杰[1] 张金皛 田军[1] 冯港雯 张忠明[1] 

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048 [2]金堆城钼业集团有限公司,陕西华县714102

出　　处：《材料热处理学报》2015年第7期205-209,共5页Transactions of Materials and Heat Treatment

基　　金：陕西省国际科技合作重点项目计划(2013KW16);陕西省教育厅科研计划项目(2013JK0914);西安理工大学科学研究计划项目(2013CX004)

摘　　要：在430℃大气条件下对纯镁表面进行扩渗锌处理,研究了扩渗时间对渗层厚度与组织性能的影响。结果表明,在纯镁表面可以形成均匀平滑扩渗锌层,渗锌层由Zn、α-Mg和金属间化合物Mg7Zn3、Mg0.97Zn0.03组成。渗层厚度随扩渗时间延长而增加,表面硬度随之提高,其中扩渗16 h硬度最高,达到168 HV0.01,这与渗层中的金属间化合物含量提高有关。同时,扩渗8-16 h的渗层在3.5%Na Cl溶液中耐腐蚀性能较好,渗层可以保护纯镁基体。Zn-enriched surface coating was prepared on pure magnesium through zinc atom diffusing at 430 ℃ under the atmospheric. The effect of diffusion time on the thickness,microstructure and properties of the coating was investigated. The results show that the uniform and continuous coating can be formed on pure magnesium surface; the coating consists of Zn,α-Mg,Mg0. 97Zn0. 03 and Mg7Zn3intermetallic compounds. The thickness and hardness of the coating surface increase with the treatment time increasing. The thickness of zinc coating increases with the diffusion time extension,and the coating surface hardness also increases. The highest value of hardness can reach 168 HV0. 01 when the diffusion time is 16 h due to the content of intermetallic compounds in the coating. At the same time,the coating with diffusing 8 to 16 h exhibits excellent corrosion resistance in 3. 5% NaCl solution,the pure magnesium substrate can be protected by the coating.

关 键 词：扩渗时间 热扩渗锌层 显微硬度 极化曲线 耐蚀性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]