论文部分内容阅读
为了改善镁合金耐蚀性,采用冷喷涂技术在镁合金AZ31上制备出纳米晶铝涂层,分析了涂层的微观组织,通过电化学试验及中性盐雾试验研究了涂层及基体的腐蚀性能。试验结果表明,涂层的纳米晶结构成功保留,涂层组织致密、厚度均匀,涂层硬度到达111.44 HV0.025,明显高于镁合金基体的硬度(66.8 HV0.025);涂层的自腐蚀电位(-0.78 V)高于镁合金基体的自腐蚀电位(-1.79 V),涂层的自腐蚀电流密度(5.3×10-7A/cm2)比镁合金基体的自腐蚀电流密度(2.45×10-5A/cm2)低2个数量级,盐雾试验表明涂层的耐腐蚀性能明显优于镁合金基体。
In order to improve the corrosion resistance of magnesium alloy, nanocrystalline aluminum coating was prepared on AZ31 magnesium alloy by cold spraying technique. The microstructure of the coating was analyzed. Electrochemical tests and neutral salt spray tests were carried out to study the effects of coating and matrix Corrosion performance. The experimental results show that the nanocrystalline structure of the coating is successfully retained, the coating is dense and uniform in thickness, the hardness of the coating reaches 111.44 HV0.025, which is obviously higher than that of the magnesium alloy substrate (66.8 HV0.025) (-0.78 V) is higher than the self-corrosion potential (-1.79 V) of the magnesium alloy substrate, the self-corrosion current density (5.3 × 10-7 A / cm2) of the coating is higher than that of the magnesium alloy substrate (2.45 × 10 -5A / cm2) two orders of magnitude lower, salt spray test showed that the corrosion resistance of the coating was significantly better than the magnesium alloy substrate.