磁控溅射AlCr涂层对电工纯铁防腐性能的影响  

Effect of Magnetron Sputtering AlCr Coating on Corrosion Resistance of Electrical Pure Iron

作　　者：聂开勋 吴兵[1] 陈志会 唐正强[1] NIE Kaixun;WU Bing;CHEN Zhihui;TANG Zhengqiang(School of Mecha nical Engineering,Guizhou University,Guiyang 550025,China;China Zhenhua Electronics Group Yuguang Electric Co.,Ltd.,Guiyang 550018,China)

机构地区：[1]贵州大学机械工程学院,贵州贵阳550025 [2]中国振华电子集团宇光电工有限公司,贵州贵阳550018

出　　处：《热加工工艺》2024年第6期77-84,共8页Hot Working Technology

基　　金：贵州省科技计划项目(黔科合基础[2020]1Y415);贵州省科技支撑计划项目(黔科合支撑[2021]一般365);贵州大学培育项目([2019]24号)。

摘　　要：为了提高电工纯铁的耐腐蚀性能,基于磁控溅射技术,在电工纯铁表面制备了Al Cr涂层。采用X射线衍射仪、扫描电子显微镜对涂层表面形貌、结构和元素组成进行分析,并通过中性盐雾及电化学测试,分析了电工纯铁基体及Al Cr涂层的耐腐蚀性能。结果表明,适量Cr元素掺杂可以使涂层致密化,在Cr靶功率为75 W时效果最好。随着Cr的加入,Al Cr涂层呈现不同的化合物态,包括Al_(8)Cr_(5)、Al1_(3)Cr_(2)等相。中性盐雾及电化学测试结果均表明Cr-75涂层的耐腐蚀性能最好,在经过158 h的盐雾测试之后涂层依然没有被腐蚀;Cr-75涂层阻抗比纯铁高约2个数量级,腐蚀电流密度为7.4×10^(-9)A/cm^(2),相对于电工纯铁(1.6×10^(-6)A/cm^(2))降低了约3个数量级,点蚀电位与腐蚀电位之间的电位差最大(0.272 V),抗点蚀性能最好,保护效率高达98.8%。In order to improve the corrosion resistance of electrical pure iron,the Al Cr coatings were prepared on pure iron substrate by magnetron sputtering.The surface morphology,structure and element composition of the coatings were analyzed by XRD and SEM.The corrosion resistance of the electrical pure iron and the Al Cr coatings were analyzed by neutral salt spray test and electrochemical test.The results show that the coatings can be densified by doping appropriate amount of Cr element,and the Al Cr coating shows the best anti-corrosion performance when the Cr target power is 75 W.With the doping of Cr,the Al Cr coatings present different chemical compounds,such as Al_(8)Cr_(5),Al_(13)Cr_(2)and other phases.The neutral salt spray and electrochemical test results show that the corrosion resistance of Cr-75 coating is the best.After 158 h of salt spray test,no corrosion phenomenon is observed.The resistance of Cr-75 coating is about 2 orders of magnitude higher than that of pure iron,and the corrosion current density is 7.4×10^(-9)A/cm^(2),which is about 3 orders of magnitude lower than the pure iron(1.6×10^(-6)A/cm^(2)).The potential difference between the pitting potential and the corrosion potential is the largest for Cr-75 coating(0.272 V).In addition,the anti-pitting performance for Cr-75 is the best,and the protection efficiency is 98.8%.

关 键 词：磁控溅射 电工纯铁 AlCr涂层 腐蚀 

分 类 号：TG174.4[金属学及工艺—金属表面处理]