实海暴露黄铜脱锌腐蚀行为及抑制脱锌机理研究  

DEZINCIFICATION CORROSION BEHAVIOR AND ITS INHIBITING MECHANISM OF BRASS EXPOSED TO SEAWATER

作　　者：刘增才[1] 林乐耘[1] 刘少峰[1] 

机构地区：[1]北京有色金属研究总院

出　　处：《腐蚀科学与防护技术》1999年第2期78-83,共6页Corrosion Science and Protection Technology

基　　金：国家自然科学基金

摘　　要：采用金相、扫描电子显微镜和电子探针Ｘ射线能谱成分分析方法研究了黄铜实海暴露脱锌腐蚀特征及抑制机理．通过对长期实海暴露试样的腐蚀产物和合金基体进行成分分析及形貌观察，研究表明加Ａｓ的Ｈ６８Ａ黄铜晶界优先发生脱锌腐蚀，而加Ｓｎ后，由于强化了晶界，大大提高了单相α黄铜（ＨＳｎ７０－１Ａ）的耐蚀性能．而对双相ＨＳｎ６２－１黄铜，添加Ｓｎ，可在一定程度上抑制脱锌，但并不足以阻止腐蚀沿β相之间的α相晶界的连通．In present paper, characteristic and mechanism of corrosion of brass exposed to seawater for several years, including alloys with single phase and α+β double phase, have been investigated by means of metallograph, SEM, EDXA and so on. It was shown that severe corrosion with intergranular and dezincification characteristic occurred for the specimens of H 68A , which was single α phase brass with As addition. For the brass of H Sn70-1A , which was single phase alloy with As and Sn additions, could exhibit much better corrosion resistance with Sn rich corrosion product film. Sn element was much easier to enrich at grain boundaries. This would inhibit dezincification of the α+β double phase brass to some extent. However, it was not enough for the Sn element addition in the brass H Sn62-1 with α+β double phase to resist dezincification corrosion getting through phase and grain boundaries of the brass. It was observed that diffusion of alloying elements at boundaries played an important role on the corrosion behavior of both α phase and α+β double phase brass.

关 键 词：黄铜 实海暴露 脱锌腐蚀 晶界扩散 腐蚀 

分 类 号：TG172.5[金属学及工艺—金属表面处理] TG171[金属学及工艺—金属学]