AZ80挤压镁合金微弧涂层的耐蚀性能  

Corrosion properties of micro⁃arc oxidation coating on AZ80 extruded magnesium alloy

作　　者：汤嘉琪 薛玉娜[1] 王灿坤 申毅[1] 刘晓龙 姬蕴卓 方烨 王博瑶 Tang Jiaqi;Xue Yuna;Wang Cankun;Shen Yi;Liu Xiaolong;Ji Yunzhuo;Fang Ye;Wang Boyao(School of Materials Science and Engineering,Xi'an Shiyou University,Xi'an Shaanxi 710065,China;Engineering Technology Department of Xinjiang Oilfield Company,Karamay Xinjiang 834009,China;Xi'an Flit Heat Treatment Co.,Ltd.,Xi'an Shaanxi 710065,China)

机构地区：[1]西安石油大学材料科学与工程学院,陕西西安710065 [2]新疆油田公司工程技术处,新疆克拉玛依834009 [3]西安福莱特热处理有限公司,陕西西安710065

出　　处：《金属热处理》2024年第1期256-261,共6页Heat Treatment of Metals

基　　金：西安市科技计划(22GXFW0106);西安石油大学2021年省级大学生创新创业训练计划(S202110705109);陕西省自然科学基础研究计划青年项目(2022JQ-339)。

摘　　要：针对镁合金裸露动件的服役环境及表面防护特点,采用微弧氧化(MAO)表面处理技术在AZ80挤压合金表面制备MAO涂层,通过连续盐雾加速腐蚀试验,研究了AZ80合金基体及MAO涂层的静态腐蚀性能,并对AZ80合金基体和MAO涂层试样进行预腐蚀,通过慢应变速率拉伸试验研究了MAO涂层及预腐蚀时间对AZ80镁合金腐蚀行为的影响。结果表明,MAO涂层具有较好的静态防护性能,盐雾腐蚀6天后出现点蚀现象,涂层破裂后的腐蚀行为取决于AZ80合金基体的耐蚀性。在慢应变速率拉伸状态下,随着预腐蚀时间的延长,AZ80基体和MAO涂层的应力腐蚀敏感性增加,MAO涂层的应力腐蚀敏感性指数明显小于AZ80合金基体。MAO涂层试样对AZ80基体有明显的防护作用,可有效提高镁合金的耐蚀性。Aiming at the service environment and surface protection characteristics of magnesium alloy exposed moving parts,micro⁃arc oxidation(MAO)coating was prepared on AZ80 extruded magnesium alloy.The static corrosion properties of the AZ80 alloy substrate and MAO coating were studied by continuous slat fog corrosion test.Moverover,pre⁃corrosion of the AZ80 alloy substrate and MAO coating was carried out,and the effect of MAO coating and pre⁃corrosion time on the corrosion behavior of the AZ80 alloy were analyzed through slow strain rate tensile test.The results show that the MAO coating has good static protection properties.While after salt fog corrosion for 6 days,the pitting corrosion occurs,and then after the coating is damaged the corrosion depends on the corrosion resistance of the AZ80 alloy substrate.Under the slow strain rate tensile condition,the stress corrosion sensitivity increases with the prolongation of the pre⁃corrosion time,while the stress corrosion sensitivity index of MAO coating is obviously smaller than that of the AZ80 substrate.The MAO coating has obvious protective effect for the AZ80 substrate,which can effectively improve the dynamic corrosion resistance of the magnesium alloy.

关 键 词：AZ80挤压镁合金 微弧氧化 盐雾腐蚀 应力腐蚀 

分 类 号：TG142.2[一般工业技术—材料科学与工程]