不同偏压对45#钢电弧离子镀铝层耐蚀性能的影响  

Effect of Different Bias Voltages on Anti-corrosion Properties of Multi-arc Ion Plated Al-coatings on 45#Carbon Steel

作　　者：师超 李嘉浩 王荣祥 张博[2] 周兰欣 刘光明[1] 邵亚薇[3] SHI Chao;LI Jiahao;WANG Rongxiang;ZHANG Bo;ZHOU Lanxin;LIU Guangming;SHAO Yawei(Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province,Nanchang Hang Kong University,Nanchang 330063,China;The 5th Electronics Research Institute of the Ministry of Industry and Information Technology,Guangzhou 510610,China;College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]南昌航空大学江西省金属材料微结构调控重点实验室,南昌330063 [2]工业和信息化部电子第五研究所,广州510610 [3]哈尔滨工程大学材料科学与化学工程学院,哈尔滨150001

出　　处：《中国腐蚀与防护学报》2024年第2期323-334,共12页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(52001155);江西省自然科学基金(111236715013);博士启动基金(EA201901056)。

摘　　要：采用不同偏压参数(0、-50、-100、-200、-300 V)电弧离子镀(AIP)沉积铝涂层。通过扫描电子显微镜(SEM)和能谱仪(EDS)对不同参数下镀铝涂层的表面及截面特征进行分析;采用开路电位(OCP)、电化学阻抗谱(EIS)和电化学极化(EI)等电化学测试及中性盐雾实验对不同参数下的镀铝涂层防护性进行研究。结果表明:随着偏压的增大,镀铝涂层孔隙及粗糙度表现出先减小后增大的趋势。各偏压参数下的镀铝涂层试样的OCP稳定在-0.72~-0.77 V之间,电荷转移电阻在(1.50~2.98)×10^(4)Ω·cm^(2)之间,自腐蚀电流密度在(1.18~5.49)×10^(-6)A·cm^(-2)之间,耐蚀性明显优于45#碳钢。经336 h盐雾实验后,各偏压参数下的镀铝涂层试样仍具有一定的防护性能,镀层及铁铝扩散层对于铁基体表现为阴极保护机制,其中偏压-200 V的镀铝涂层防护性能更优。因此,当靶电流55 A、Ar压力1.0 Pa、偏压-200 V时,AIP所制备铝涂层结构致密,与基体结合良好,具有优异的防护性能。Al-coating is considered to be an ideal protective coating for steels.Multi-arc ion plating Alcoating is of significance for improving steel corrosion resistance,because multi-arc ion plating has advantages,such as non-toxicity,non-pollution,low-energy consumption,and easy operation etc.In this pa-per,multi-arc ion plated Al-coatings on 45#carbon steel were prepared by setting different bias parameters(0,-50,-100,-200,-300 V).Their surface and cross-section morphologies were characterized by scanning electron microscope(SEM)and energy-dispersive X-ray spectroscopy(EDS).The protective properties of the coatings prepared by different bias parameters were studied by electrochemical means,such as open circuit potential(OCP)measurement,electrochemical impedance spectroscopy(EIS),electrochemical polarization(EI)measurement and neutral salt spray test.The results showed that the number of pores and roughness of the Al-coatings decrease first then increase with the increasing bias voltages.Correspondingly,their OCPs,charge transfer resistances and free-corrosion current densities were stable between-0.72~-0.77 V,(1.50~2.98)×10^(4)Ω·cm^(2),and(1.18~5.49)×10^(-6)A·cm^(-2,)respectively.It is worthy noted that the corrosion resistance of the Al-coatings was obviously better than that of the bare 45#carbon steel.Being subjected to neutral salt spray test for 336 h,the Al-coatings still exhibit protective performance to certain extent because of cathodic protection mechanism,especially the Al-coating prepared by-200 V had excellent protective properties.In conclusion,the Al-coating,which was prepared by the following process parameters i.e.,target current 55 A,Ar gas pressure 1.0 Pa,and bias voltage-200 V,is compact with better adhesive to the substrate thus exhibits the best protective performance.

关 键 词：多弧离子镀 镀铝涂层 耐蚀性 电化学测试 盐雾实验 

分 类 号：TG156[金属学及工艺—热处理]