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283K ，30 g/L NaCl溶液中含15%Cr、25%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Cr9Al 17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600℃，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 pla ting 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 t he coating and the target shows that the chromium contents of the coating are ve ry different from that of the target.It is proved that Al-Cr alloy coating of th e chromium contents of 1.5%～5% can be regarded as the anodic coatings for norma l steel matrix,which accordingly has good electrochemical protection function i n 283K,30 g/L NaCl solution.The major phases of the coating are Al and a small q uality of Cr9Al17.Cr9Al17 in the coating increases with the Cr c ontent 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.
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