锻压技术

限制模压变形制备超细晶纯铜板材及其耐腐蚀性能

英文标题：Ultrafine grained copper sheet prepared by constrained groove pressing and its corrosion resistance

作者：王宗申管延锦崔惟春方晓英潘尧坤

单位：山东理工大学山东大学

分类号：TG113；TG146

出版年,卷(期):页码：2018,43(6):142-146

摘要：

通过限制模压变形制备超细晶纯铜板材，研究变形道次对纯铜的微观组织、力学性能及变形均匀性的影响，采用极化法、电位时间曲线、浸泡试验等研究限制模压变形前后纯铜板材的耐腐蚀性能变化。结果表明，限制模压变形能够有效细化纯铜的微观组织并改善其力学性能。3道次变形后，纯铜的晶粒尺寸由退火态的30 μm减小到500 nm左右，平均显微硬度由41.4 HV提高至82.5 HV，变形均匀性也得到显著改善。同时，电化学腐蚀和浸泡腐蚀试验分析结果表明，晶粒尺寸效应与塑性变形均匀程度共同决定限制模压变形纯铜板材的耐腐蚀性能，而变形均匀性的影响效果更为明显。随着变形道次的增加，纯铜板材的局部腐蚀现象逐渐缓解，腐蚀过程更为均匀，耐腐蚀性能得到一定程度的提高。

Ultrafine grained copper sheets were prepared by constrained groove pressing, and the influences of pass number on microstructure, mechanical properties and deformation homogeneity of copper were studied. The corrosion resistance of copper sheets before and after constrained groove pressing was studied by Tafel extrapolation method, potentialtime curve and immersion corrosion tests. The result shows that the microstructure of copper is effectively refined by constrained groove pressing, and its mechanical properties are improved. After three passes, the grain size of copper is refined to about 500 nm from the annealed 30 μm, and the average microhardness increases from 41.4 HV to 82.5 HV. Thus, the deformation homogeneity is greatly improved. In addition, the analysis results of electrochemical and immersion corrosion tests reveal that the corrosion resistance of copper sheets processed by constrained groove pressing is determined by both grain size effect and homogeneity of plastic deformation, and the influence of deformation homogeneity is more remarkable. Furthermore, with the increase of pass number, the local corrosion of copper sheets is gradually eased, and the corrosion process is more homogeneous. In the end, the corrosion resistance is enhanced to a certain degree.

基金项目：

国家自然科学基金资助项目（51605266）;山东省中青年科学家科研奖励基金项目（ZR2016EMB22）

王宗申（1986-），男，博士，讲师；Email：wangzsh@sdut.edu.cn

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