镁合金表面加弧辉光离子渗镀Ti的腐蚀性能研究

Corrosion Behaviors of Magnesium Alloy AZ91 Coated with Ti by Arc-Glow Plasma Depositing

摘要:

加弧辉光离子渗镀技术将辉光放电与弧光放电有机地结合起来,利用辉光放电空心阴极效应使工件迅速升温,同时在真空容器壁上设置一个或多个金属阴极电弧靶源,利用真空电弧放电而不断地发射出高能量、高电流密度、高离化率的欲渗金属离子流,依靠扩散和离子轰击作用快速渗入工件表面层,在工件表面可以形成渗层、镀层、渗镀结合层.在实验条件下对镁合金AZ91表面渗镀了Ti,采用极化曲线测试和盐雾实验分析了处理后材料的腐蚀行为,用扫描电镜（SEM）分析了Ti镀膜的表面形貌,用电子衍射光谱（EDS）和辉光放电光谱仪（GDS）分析了表面化学成分分布.结果表明渗镀Ti显著提高了AZ91的耐腐蚀性.

Abstract:

Arc-glow plasma depositing technique is a new surface coating method. With the help of vacuum arc discharge, a cold cathode arc source continually emits ion beams of coating elements with high currency density and high ionizing ratio. Upon the ion bombard and diffusion work on, the surfaces of the parts form deposited layers, diffusion layers. In this study, a commercial magnesium alloy AZ91 was coated with Ti film layer. The corrosion behaviors of the coated samples have been studied by methods of measuring anodic polarization curves and salt spray test. Section and surface morphology of Ti film have been surveyed through scanning electronic microscopy (SEM), the composition analyzed by electron diffraction spectrum (EDS) and glow discharge spectrum (GDS). The results indicated that the coating of Ti effectively improved the anti-corrosion performance of AZ91.