沈阳大气环境下纯铜的初期腐蚀行为  

CORROSION BEHAVIOR OF PURE COPPER DURING INITIAL EXPOSURE STAGE IN ATMOSPHERE OF SHENYANG CITY

作　　者：安百刚[1] 张学元[1] 韩恩厚[1] 

机构地区：[1]中国科学院金属研究所环境腐蚀中心

出　　处：《金属学报》2007年第1期77-81,共5页Acta Metallurgica Sinica

基　　金：同家重点基础研究计划项目1999065004;国家自然科学基金项目50101011资助

摘　　要：通过1年的遮雨和未遮雨大气暴露实验,研究了在沈阳大气环境下纯铜的初期腐蚀行为．不同暴露环境下,纯铜的大气腐蚀速率、腐蚀产物组成及其保护性都存在差异．未遮雨暴露条件下,纯铜的大气腐蚀速率较高,尤其在降雨较多的暴露期间,雨水冲刷使纯铜经历了更长的润湿周期,从而显著加速了纯铜的大气腐蚀．不同暴露条件下,纯铜表面形成的大气腐蚀产物主要为Cu2O．遮雨条件下,腐蚀产物的组成还有Cu4SO4(OH)6·H2O和Cu4SO4(OH)6;而未遮雨条件下,雨水的冲刷、溶解作用延缓了Cu4SO4(OH)6·H2O的形成,因而在6个月时腐蚀产物仅为Cu2O;随着暴露周期的延长, 12个月后逐渐有Cu4SO4(OH)6·H2O形成．未遮雨暴露的纯铜表面形成了致密的厚腐蚀产物膜,有效地抑制了大气腐蚀的阴极反应,具有更好的保护性．Atmospheric corrosion of pure copper under sheltered and unsheltered exposure conditions during 1 year period in Shenyang atmosphere is studied. Atmospheric corrosion rate of pure copper, composition and protectiveness of corrosion product are different under the different exposure conditions. Corrosion rate of pure copper exposed to unsheltered condition is higher than that exposed to shelter. Especially during the rainy season, the corrosion is accelerated due to the runoff effect of rain. The main corrosion products under the different exposure conditions are Cu2O, but also Cu4SO4- （OH）6·H2O and Cu4SO4（OH）6 under shelter. However, the effects of runoff and dissolution of rain on the corrosion products delayed the formation process of Cu4SO4（OH）6·H2O, which appeared only after 12 months under unsheltered condition. The thicker and compact corrosion film formed under the unsheltered exposure, which could inhibit the cathodic reaction of copper corrosion effectively, and thus provided a better protectiveness.

关 键 词：纯铜 大气腐蚀 腐蚀速率 腐蚀产物 

分 类 号：TG174[金属学及工艺—金属表面处理]