镁合金无铬化学转化膜的耐蚀性研究  

Studies on Corrosion Resistance of a Non-Chromate Conversion Coating for Magnesium Alloys

作　　者：周婉秋[1] 单大勇[1] 韩恩厚[1] 柯伟[1] 

机构地区：[1]中国科学院金属研究所腐蚀与防护国家重点实验室,辽宁沈阳110016

出　　处：《材料保护》2002年第2期12-14,共3页Materials Protection

摘　　要：在非高锰酸钾的锰盐和磷酸盐组成的体系中 ,加入镁缓蚀剂 ,在AZ31D镁合金上获得了化学转化膜。用阳极极化曲线和中性盐溶液浸泡测试了转化膜的耐蚀性 ,转化膜经 5 %NaCl侵蚀后具有自愈合能力。XRD分析表明 ,转化膜主要为Mn3 (PO4 ) 2 ;SEM观察表明 ,转化膜为规则的结晶状形貌。A chromium\|free conversion coating for magnesium alloys had been obtained by adding an inhibitor in the solution containing a non\|permanganate manganese salt and phosphate. Corrosion resistance of the chemical conversion coating was evaluated by anodizing polarization curve and salt immersion. The conversion coating had self\|healing action after being corroded by 5% NaCl solution. XRD analysis showed that the conversion coating was composed of Mn\-3(PO\-4)\-2. Regular crystalline morphology of surface film was observed by using SEM.

关 键 词：镁合金 无铬化学转化膜 耐蚀性 镁缓蚀剂 

分 类 号：TG175.3[金属学及工艺—金属表面处理] TG174.45[金属学及工艺—金属学]