喷丸对6082铝合金耐腐蚀性能的影响
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摘要
采用极化曲线、X射线残余应力分析仪(XSTRESS ROB)测量残余应力、扫描电镜(SEM)观察腐蚀形貌,并使用透射电镜(TEM)观察析出相的形貌和分布,研究了喷丸处理对6082铝合金耐腐蚀性能的影响,并系统解释了其腐蚀机理。研究结果表明:喷丸后合金材料表面的残余压应力增加,使得铝合金表层硬度升高。喷丸处理细化了合金表层晶粒,组织致密性提高,腐蚀性溶液难以渗入,从而降低了腐蚀电流密度和腐蚀速率。喷丸处理后的材料表面几乎完全被腐蚀产物Al(OH)3覆盖,极化曲线上出现明显的阳极钝化区间,点蚀电流比喷丸前明显降低,腐蚀速率下降,合金的耐腐蚀性能得以提高。
The effect of shot peening on the corrosion resistance of 6082 aluminum alloys was systematically investigated and the corrosion mechanism was explained.The residual stress was measured by X-ray residual stress analyzer( XSTRESS ROB),and the corrosion morphology was studied by means of polarization curve and scanning electron microscopy( SEM).The morphology and distribution of the precipitates were observed by means of transmission electron microscope( TEM).The results of the study show that the residual compressive stress on the surface of the alloy after shot peening increases and the hardness of the surface layer of the aluminum alloy increases.Shot peening refines the surface grains of the alloy,improves the compactness of the structure,makes the corrosive solution difficult to infiltrate into the alloy,and thereby reduces the corrosion current density and the corrosion rate.The surface of the shot peened material is almost completely covered by the corrosion product Al( OH)3.A significant anode passivation zone appears on the polarization curve.The pitting current is significantly lower than before shot peening,the corrosion rate is reduced,and the corrosion resistance of the alloy is reduced.
The effect of shot peening on the corrosion resistance of 6082 aluminum alloys was systematically investigated and the corrosion mechanism was explained.The residual stress was measured by X-ray residual stress analyzer( XSTRESS ROB),and the corrosion morphology was studied by means of polarization curve and scanning electron microscopy( SEM).The morphology and distribution of the precipitates were observed by means of transmission electron microscope( TEM).The results of the study show that the residual compressive stress on the surface of the alloy after shot peening increases and the hardness of the surface layer of the aluminum alloy increases.Shot peening refines the surface grains of the alloy,improves the compactness of the structure,makes the corrosive solution difficult to infiltrate into the alloy,and thereby reduces the corrosion current density and the corrosion rate.The surface of the shot peened material is almost completely covered by the corrosion product Al( OH)3.A significant anode passivation zone appears on the polarization curve.The pitting current is significantly lower than before shot peening,the corrosion rate is reduced,and the corrosion resistance of the alloy is reduced.
引文
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[2]Ezuber H,El-Houd A,El-Shawesh F.A study on the corrosion behavior of aluminum alloys in seawater[J].Materials&Design,2008,29(4):801-805.
[3]宋诗哲,唐子龙.工业纯铝在3.5%Na Cl溶液中的电化学阻抗谱分析[J].中国腐蚀与防护学报,1996,16(2):127-132.Song Shizhe,Tang Zilong.Electrochemical impedance spectroscopy analysis of industrial pure aluminum in 3.5%Na Cl solution[J].Journal of Chinese Society for Corrosion and,1996,16(2):127-132.
[4]邵麟.铝合金在3.5%Na Cl溶液中的腐蚀行为研究及外加阴极电流保护[D].哈尔滨:哈尔滨工程大学,2012.Shao Lin.Corrosion behavior of aluminum alloy in 3.5%Na Cl solution and external cathodic current protection[D].Harbin:Harbin Engineering University,2012.
[5]邢清蒲,张凌峰,李少哲,等.激光冲击强化对2A02铝合金电化学腐蚀行为的影响[J].腐蚀科学与防护技术,2013,25(5):402-405.Xing Qingpu,Zhang Lingfeng,Li Shaozhe,et al.Effect of laser shock strengthening on electrochemical corrosion behavior of 2A02 aluminum alloy[J].Corrosion Science and Protetion Technology,2013,25(5):402-405.
[6]周仲柏,陈永言.电极过程动力学基础教程[M].武汉:武汉大学出版社,1989.
[7]Shan J,Hou D,Zhang J,et al.Effects of the extrusion ratio on the intergranular corrosion behaviour of 6082 aluminium alloy[J].Materials and Corrosion,2018,69(3):365-375.
[8]曹楚南.腐蚀电化学[J].自然杂志,1983,6(4):266-270.Cao Chunan.Corrosion Electrochemistry[J].Journal of Nature,1983,6(4):266-270.
[9]杨福宝,何优锋,李大全,等.表面喷丸处理对SSM319s铝合金耐盐雾腐蚀性能的影响[J].稀有金属,2014,38(6):941-947.Yang Fubao,He Youfeng,Li Daquan,et al.Effect of surface shot peening on salt spray corrosion resistance of SSM319s aluminum alloy[J].Rare Metals,2014,38(6):941-947.
[10]刘兆华,陈亮维,席健,等.高层错能7003铝合金ECAP晶粒细化位错机制研究[J].稀有金属材料与工程,2013,42(7):1407-1410.Liu Zhaohua,Chen Liangwei,Xi Jian,et al.Study on the grain refinement dislocation mechanism of high-level dislocation 7003aluminum alloy ECAP[J].Rare Metal Materials and Engineering,2013,42(7):1407-1410.
[11]李金魁,姚枚,王仁智.喷丸残余应力场特征值规律的研究[J].应用科技,1990(4):32-38.Li Jinkui,Yao Mei,Wang Renzhi.Study on the law of characteristic value of residual stress field in shot peening[J].Journal of Applied Science,1990(4):32-38.
[12]王江涛,张永康,陈菊芳,等.强激光冲击对7075铝合金等离子弧焊接头电化学腐蚀行为的影响[J].中国激光,2015(12):106-115.Wang Jiangtao,Zhang Yongkang,Chen Jufang,et al.Effect of intense laser shock on electrochemical corrosion behavior of 7075 aluminum alloy plasma arc welding ioint[J].China Laser,2015(12):106-115.
[13]Pidaparti R M,Patel R R.Correlation between corrosion pits and stresses in Al alloys[J].Materials Letters,2008,62(30):4497-4499.
[14]侯丹丹.6082铝合金的微观组织演变规律和晶间腐蚀行为研究[D].长春:长春理工大学,2017.Hou Dandan.Study on microstructure evolution and intergranular corrosion behavior of 6082 aluminum alloy[D].Changchun:Changchun University of Science and Technology,2017.
[15]张贺佳,陈礼清,李建杰,等.碳化物及合金元素对酸液膜中晶粒腐蚀形态的影响[J].东北大学学报(自然科学版),2016,37(2):189-193.Zhang Hejia,Chen Liqing,Li Jianjie,et al.Effects of carbides and alloying elements on grain corrosion morphology in acid films[J].Journal of Northeastern University(Natural Science),2016,37(2):189-193.
[16]张华,孙大同,张贺,等.2219铝合金搅拌摩擦焊接接头剥落腐蚀机理[J].稀有金属材料与工程,2015,44(1):103-107.Zhang Hua,Sun Datong,Zhang He,et al.Peeling corrosion mechanism of 2219 aluminum alloy friction stir welding joint[J].Rare Metal Materials and Engineering,2015,44(1):103-107.
[17]詹肇麟.喷丸加速制备纳米结构铝化物涂层的研究[D].北京:北京科技大学,2005.Zhan Zhaolin.Study on accelerated preparation of nanostructured aluminide coating by shot peening[D].Beijing:University of Science and Technology Beijing,2005.