超细晶铬青铜在盐酸溶液中的腐蚀行为  

Corrrosion Behavior of Ultra-fine Grain Chromiun Bronze in HCl Solutions

作　　者：张雅妮[1] 张勇[2] 李刚[2] 罗金恒 

机构地区：[1]西安石油大学材料科学与工程学院,西安710065 [2]塔里木油田销售事业部,库尔勒841000 [3]中国石油集团石油管工程技术研究院,西安710065

出　　处：《腐蚀与防护》2011年第10期772-774,796,共4页Corrosion & Protection

基　　金：国家高技术研究发展计划(2002AA331110)资助项目

摘　　要：采用自然浸泡试验和电化学测试研究了等径弯曲通道法(ECAP)制备的超细晶铬青铜在盐酸溶液中的腐蚀行为。结果表明,EACP加工可提高超细晶铬青铜在盐酸溶液中的自腐蚀电位,其浸泡失重速率较粗晶合金试样变化不大。腐蚀初期,超细晶铬青铜的腐蚀速率高于粗晶粒铬青铜5%～15%左右,后期则低出粗晶粒铬青铜5%～15%左右。扫描电镜观察显示,EACP加工改变了合金的腐蚀形态;粗晶合金初期的腐蚀形态呈现沿晶腐蚀,随时间延长逐渐向均匀腐蚀过渡;而超细晶合金始终为均匀腐蚀。The corrosion behavior of ultra-fine grain （UFG） chromium bronze prepared by equal-channel angular pressing （ECAP） in HC1 solutions was studied by electrochemical method and immersion method. The results showed that the E value of UFG specimen was higher than that of coarse grain （CG） specimen, but the change of the immersion weight loss rate was small. The immersion weight-loss rate of UFG specimen was 5 % - 15 % higher than that of CG specimen in the initial stage and 5%-15% lower in the later stage. The results of SEM showed that the corrosion form was changed by ECAP process. Intergranutar corrosion was mainly happened for CG specimen in the initial stage and then changed to the uniform corrosion. Uniform corrosion occured for UFG chromiun bronze for the whole time.

关 键 词：ECAP 超细晶铬青铜 盐酸溶液 腐蚀 

分 类 号：TG174.2[金属学及工艺—金属表面处理]