Al7Si0.5Mg合金喷丸处理微观组织形貌及腐蚀行为研究  

Surface Microstructure Characterization and Corrosion Behavior of Al7Si0.5Mg Aluminum Alloy After Shot Peening Treatment

作　　者：秦传广 姜博[1] 刘乃志 王晔[1] 胡茂良[1] 许红雨[1] 吉泽升 尚金翅 QIN Chuanguang;JIANG Bo;LIU Naizhi;WANG Ye;HU Maoliang;XU Hongyu;JI Zesheng;SHANG Jinchi(School of Materials Science and Chemical Engineering,Harbin University of Science and Technology,Harbin 150080,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Harbin Jixing Mechanical Engineering Co.,Ltd.,Harbin 150060,China;Shandong Jinma Automotive Equipment Technology Co.,Ltd.,Linyi 276016,Shandong,China)

机构地区：[1]哈尔滨理工大学材料科学与化学工程学院,哈尔滨150080 [2]东北大学材料科学与工程学院,沈阳110819 [3]哈尔滨吉星机械工程有限公司,哈尔滨150060 [4]山东金马汽车装备科技有限公司,山东临沂276016

出　　处：《材料导报》2025年第9期142-148,共7页Materials Reports

基　　金：黑龙江省科技重大专项(2021ZX05A02);黑龙江省博士后基金(LBH-Z21165);黑龙江省省属本科高校基本科研业务(2021-KYYWF-0737)。

摘　　要：本工作探究了不同喷丸速度下的Al7Si0.5Mg铝合金耐腐蚀性的影响规律,将喷丸处理后的合金在质量分数3.5%的NaCl溶液中进行电化学测试和浸没腐蚀,采用XRD、SEM、超深显微镜、EBSD等手段对腐蚀后合金的物相组成、表面形貌、变形层及腐蚀产物进行表征。研究结果表明,经喷丸处理后,合金表面出现明显塑性变形层和亚微米级晶粒。喷丸速度为50 m/s时,变形层厚度最大,为20μm。未处理样品的i_(corr)为64.628μA/cm^(2),电容弧半径最小;喷丸速度为50 m/s时i_(corr)为16.094μA/cm^(2),电容弧半径最大。在质量分数3.5%的NaCl溶液中浸泡480 h后,喷丸速度为50 m/s时腐蚀坑较浅,表现出较为优异的抗腐蚀性。The effects of different shot peening speeds on corrosion resistance of Al7Si0.5Mg aluminum alloy were investigated in this work.The shot peened alloy specimens were subjected to electrochemical test and immersion corrosion in 3.5%NaCl solution.The phase composition,surface morphology,deformed layer and corrosion products of the corroded alloy were characterized by XRD,SEM,ultra-deep microscope and EBSD.The results show that after shot peening,obvious plastic deformation layer and submicron grain appear on the surface of the alloy.The maximum thickness of the deformation layer is 20μm when the shot peening speed is 50 m/s.The i_(corr) of the untreated sample was 64.628μA/cm^(2),and the radius of the capacitor arc was the minimum.While the i_(corr) of the sample treated with a shot peening speed of 50 m/s is 16.094μA/cm^(2) and the radius of the capacitor arc is maximum.Immersion in 3.5%NaCl solution for 480 h,the sample treated with a shot peening speed of 50 m/s shows a relatively shallow corrosion pit,showing relatively excellent corrosion resistance.

关 键 词：Al7Si0.5Mg铝合金 喷丸处理 晶粒细化 腐蚀行为 

分 类 号：TG66[金属学及工艺—金属切削加工及机床]