Improvement of pitting corrosion resistance for Al-Cu alloy in sodium chloride solution through equal-channel angular pressing

作     者：Dan SONG,Ai-bin MA,Jing-hua JIANG,Ping-hua LIN,Liu-yan ZHANG College of Mechanics and Materials,Hohai University,Nanjing 210098,China 

作者机构：College of Mechanics and Materials Hohai University Nanjing 210098 China 

出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))

年 卷 期：2011年第21卷第4期

页      面：307-313页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project(SBK201020174) supported by the Natural Science Foundation of Jiangsu Province,China Project(2011B08214) supported by the Fundamental Research Funds for the Central Universities Project(2009425411) supported by the Natural Science Foundation of Hohai University,China Project(20101146) supported by the Program for Transformation & Industrialization of Scientific and Technological Achievements in the industrial field by Changzhou City of Jiangsu Province,China Project(AMM201007) supported by the Opening Project of Jiangsu Key Laboratory of Advanced Metallic Materials,China 

主　　题：Al-Cu alloy equal-channel angular pressing pitting corrosion resistance ultrafine-grained particle 

摘      要：Significant corrosion resistance improvement was achieved in solid-solution treated(T4) Al-Cu alloy after severe grain refinement through equal-channel angular *** bulk ultrafine-grained Al-Cu alloy with grain sizes of 200-300 nm has higher pitting potential(elevated by about 34 mV,SCE) and lower corrosion current density(decreased by about 3.88μA/cm~2) in polarization tests than the as-T4 alloy,and increased polarization resistance(increased by about 5.7 kΩ·cm~2) in electrochemical impendence spectrum tests,along with alleviated corrosion damage in immersion *** factors responds to the improved corrosion resistance of the alloy:the first is the refinement of residualθ-phase(Al2Cu) particles leading to the lower micro-galvanic currents and reduced susceptibilities to pitting corrosion,the second is the mass of strain-induced crystalline defects providing more nucleation sites for the formation of more volume fractions of stable oxide film.