摘要
在AZ31镁合金表面进行了磁控溅射铝防护层的镀覆，并研究了镀层的成分分布、形貌、显微力学性能、防腐蚀性能及工艺条件对镀层的影响。结果表明：直径为1～2μm的细小晶粒均匀在镁合金基体表面沉积形成致密铝镀层，镀层和基体之间存在混融的过渡层；镀层表面粗糙度在2μm以下并与基体结合良好，其硬度、弹性模量等高于镁合金基体并具有一定韧性和弹塑性能；适当降低氩气压力，提高溅射电流，可改善镀层质量。镀层提高了镁合金基体的自腐蚀电位并降低了腐蚀电流，从而抑制了腐蚀倾向，但自腐蚀电位低于热喷涂铝电位且腐蚀电流高于微弧氧化处理电流。
Aluminum protective coating was deposited on AZ31 magnesium alloy by magnetron sputtering. The composition profile, morphology, micromechanical properties, anticorrosion performance and influence of processing conditions on the coating were investigated. The results show that fine crystals sized 1-2μm deposited uniformly to form dense coating on the surface of magnesium alloy substrate with a diffusion intermediate layer between them; the coating has elevated hardness, elastic modulus relative to substrate with surface roughness lower than 2μm and adhere well to the substrate being characterized by somewhat toughness; the coating quality can be improved by reducing Argon pressure and increasing sputtering current. The corrosion potential of magnesium alloy is increased and the corrosion current reduced by depositing the coating and the corrosion tendency is restrained accordingly,although the corrosion potential is lower than that of hot spray aluminum and current higher than that of macroarc oxidation.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2008年第8期993-997,共5页
China Mechanical Engineering
关键词
镁合金
磁控溅射
镀铝膜
防护层
magnesium alloy
magnetron sputtering
aluminum coating
protective
