铝合金锌系磷化膜防护失效机理探讨  

Failure Mechanism of Zinc Series Phosphating Coatings on Aluminum Alloy

作　　者：张圣麟[1] 王绍领[2] 陈燕燕[1] 荆树科[1] 

机构地区：[1]河南师范大学化学与环境科学学院,河南新乡453007 [2]濮阳职业技术学院石油化工与环境工程系,河南濮阳457000

出　　处：《材料保护》2009年第6期64-66,共3页Materials Protection

摘　　要：为加深对磷化膜防护失效机理的认识,采用电化学方法和扫描电镜(SEM)考察了铝合金锌系磷化膜在不同溶液中的腐蚀与防护特性。结果表明:磷化膜的活性溶解出现在酸性和中性溶液里;钝化出现在碱性溶液里。磷化膜的防护性能主要依靠于其机械屏障作用,化学溶解是磷化膜防护失效的主要形式。The corrosion and protection characteristics of zinc series phosphating coatings on aluminum alloy in various aqueous solutions were investigated by making use of electrochemical measurement and scanning elec-tron microscopic(SEM)observation.Results show that active dissolution of the phosphating coating occurs in acidic and neutral solutions,while passivation occurs in alkaline solution.The pro-tective ability of the phosphating coating mainly depends on the mechanical harrier action,and chemical dissolution is the primary cause leading to failure of the phosphating coating-

关 键 词：锌系磷化膜 铝合金 电化学腐蚀 防护失效 机理 

分 类 号：TG174.4[金属学及工艺—金属表面处理]