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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。
The surface of pure magnesium was infiltrated with zinc at 430 ℃. The effect of infiltration time on the thickness and microstructure of the infiltrated layer was investigated. The results show that a uniform and smooth zinc infiltration can be formed on pure magnesium surface. The zinc infiltration layer consists of Zn, α-Mg and intermetallic compounds Mg7Zn3 and Mg0.97Zn0.03. The thickness of the layer increases with the extension of the extension time, and the surface hardness increases. The hardness of the layer increases 16 h after the expansion, reaching 168 HV0.01, which is related to the increase of the intermetallic compound content in the layer. At the same time, the infiltration of 8-16 h of permeation layer is better in 3.5% NaCl solution, and the infiltration layer can protect the pure magnesium matrix.