拉伸预变形对2219铝合金板材局部腐蚀性能的影响  

Effect of tensile pre-stretching on local corrosion properties of 2219 aluminum alloy sheets

作　　者：陈高剑 刘胜胆[1,2] 覃秋慧 伍英明 何克准[3,4] 贾桂龙 张航 赵千愉[1,2] CHEN Gaojian;LIU Shengdan;QIN Qiuhui;WU Yingming;HE Kezhun;JIA Guilong;ZHANG Hang;ZHAO Qianyu(School of Material Science and Engineering,Central South University,Changsha 410083,China;Key Laboratory of Nonferrous Metal Materials Science and Engineering,Ministry of Education,Central South University,Changsha 410083,China;Guangxi ALNAN Aluminum Inc.,Nanning 530031,China;Guangxi Key Laboratory of Materials and Processing of Aluminum Alloys,Nanning 530031,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学有色金属材料科学与工程教育部重点实验室,长沙410083 [3]广西南南铝加工有限公司,南宁530031 [4]广西铝合金材料与加工重点实验室,南宁530031

出　　处：《中国有色金属学报》2024年第11期3583-3594,共12页The Chinese Journal of Nonferrous Metals

基　　金：广西科技重大专项资助项目(AA23023026)。

摘　　要：采用浸泡实验、电化学测试、扫描开尔文测试(SKPFM)、电子背散射衍射分析(EBSD)以及透射电子显微镜(TEM)等手段,研究拉伸预变形量(0~10%)对2219铝合金板材局部腐蚀性能的影响。结果表明,随着预变形量增加,最大腐蚀深度和腐蚀电流密度减小,腐蚀形式从晶间腐蚀为主逐渐转变为点蚀为主,腐蚀性能提高;预变形量从0%增大到4%时,最大腐蚀深度快速减小,而后缓慢减小。通过对比预变形前后晶界微观组织特征以及晶内和晶界区域伏打电势的变化,分析和探讨了腐蚀形式变化及腐蚀性能提高的原因。The influence of pre-stretching(0-10%)on the local corrosion resistance of 2219 aluminum alloy sheet was investigated by means of immersion test,electrochemical tests,scanning Kelvin probe force microscopy(SKPFM),electron backscatter diffraction(EBSD)and transmission electron microscopy(TEM).The maximum corrosion depth and corrosion current tend to decrease with the increase of pre-stretching and the dominant corrosion form changes from intergranular corrosion to pitting,indicating corrosion resistance increases.The maximum corrosion depth decreases significantly with pre-stretching increasing from 0%to 4%,and then slowly beyond 4%.The reason was discussed based on the microstructural and microchemical features at grain boundaries,as well as the change in volta potential within the grains and grain boundaries.

关 键 词：2219铝合金 预拉伸变形 局部腐蚀性能 伏打电势 晶界析出相 

分 类 号：TG146.2[一般工业技术—材料科学与工程]