电子束蒸发沉积Al-Cr合金涂层研究

DEPOSITION OF ALUMINIUM-CHROMIUM ALLOY COATING BY ELECTRON BEAM EVAPORATION PLATING

研究了电子束蒸发镀沉积Al-Cr合金涂层的工艺 ,探讨了铬含量对涂层耐蚀性的影响 ,对涂层的物相、形貌以及热处理对涂层和基体之间热扩散的影响进行了分析 .结果表明 :涂层中铬含量与膜料中铬含量有较大差异 ;在温度为 2 83K ,30 g/LNaCl溶液中含 1 5 %Cr、2 5 %Cr、5 %Cr的Al-Cr合金涂层的自腐蚀电位均比普通钢基材的电位负 ,因此它们作为阳极性涂层对普通钢基材能起到较好的电化学保护 ;涂层为晶态组织 ,其物相为Al和少量的Cr9Al17,随膜料中Cr含量的增加 ,其生成的Cr9Al17的量也随之增多 ;在真空蒸镀时涂层沉积有方向性 ;对涂层进行 6 0 0℃ ,1h热处理后 ,涂层与基体间元素产生了互扩散 .

In this present paper,the operation technology for preparation of aluminium-chromium alloy coating by electron beam evaporation plating was studied.Corrosion resistance of the coatings was investigated,meanwhile the phase,morphology and the effect of heat treatment on the diffusion between the Al-Cr coating and the matrix were discussed.The analysis of ingredients of the coating and the target shows that the chromium contents of the coating are very different from that of the target.It is proved that Al-Cr alloy coating of the chromium contents of 1.5%～5% can be regarded as the anodic coatings for normal steel matrix,which accordingly has good electrochemical protection function in 283K,30 g/L NaCl solution.The major phases of the coating are Al and a small quality of Cr 9Al 17.Cr 9Al 17 in the coating increases with the Cr content of the target.The deposited coating takes on the orientation.After 600℃,1 h heat treatment,ingredients of the coating and matrix diffuse each other.