摘要
研究了酸洗以及酸洗+碱洗前处理工艺对AZ91D镁合金无铬、无裂纹、低能耗钛/锆转化膜耐蚀性能的影响。结果表明,单独的酸洗前处理使得AZ91D镁合金表面的α相优先溶解,合金表面粗糙度增加,不利于钛/锆转化膜耐蚀性能的增加。合理地利用酸洗+碱洗调整AZ91D镁合金表面化学状态能够有效提高钛/锆化学转化膜的耐蚀性能。
Effect of pre-treatment processes including acid pickling and acid pickling plus alkaline cleaning on the corrosion resistance of achromium-free zirconate-titanate based conversion coating on AZ91 D magnesium alloy was systematically investigated. The results indicated that the acid pickling could induce the preferential dissolution of α phase and thereby increase the surface roughness of AZ91 D magnesium alloy, but which was not conductive to the enhancement of the corrosion resistance of the conversion coating. However, the acid pickling plus alkaline cleaning could appropriately modulate the surface chemical state of AZ91 D magnesium alloy, and therefore effectively improve the corrosion resistance of the zirconate-titanate based conversion coating.
作者
张书弟
李丽华
杨延格
张涛
王福会
ZHANG Shudi LI Lihua YANG Yange ZHANG Tao WANG Fuhui(School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China)
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2016年第5期461-467,共7页
Corrosion Science and Protection Technology
关键词
镁合金
钛锆转化膜
前处理
耐蚀性能
magnesium alloy
zirconate-titanate based conversion coating
pre-treatment
corrosion resistance
