AZ31B镁合金TIG/MIG焊焊接接头的腐蚀研究
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摘要
对AZ31B镁合金的TIG焊和MIG焊接头进行酸洗的腐蚀研究,分析腐蚀后接头各区域的表面状况及腐蚀原因,利用金相图和XRD对TIG焊和MIG焊接头的腐蚀差异进行探讨。结果表明:较大电流焊接的接头经酸洗处理后,表面较为平整且均匀,腐蚀产物相对较少,晶界具有一定连续性;晶粒细小、晶界处分布大量析出相,导致焊接接头腐蚀严重,是MIG焊与TIG焊接头酸洗腐蚀差异的主要原因。
In this paper,the corrosion porperties in acid pickling solution were studied for the joints of AZ31 B magnesium alloy welded by TIG welding and MIG welding,respectively,and the surface feature and the cause of corrosion were analyzed for each part of the joints,then the corrosion difference between the joints welded by TIG welding and MIG welding were simply discussed based on metallographic examination and XRD method. The results show that the surface of the joint welded under the condition of larger current is relatively smooth and uniform,with less the corrosion products,and the grain boundary still maintained a certain continuity. Fine grain size and large amount of precipitated phase distributed at the grain boundary would lead to severe corrosion of the welded joint,which is the main reason for the corrosion difference between the MIG welding and the TIG welding joints treated by acid pickling solution.
In this paper,the corrosion porperties in acid pickling solution were studied for the joints of AZ31 B magnesium alloy welded by TIG welding and MIG welding,respectively,and the surface feature and the cause of corrosion were analyzed for each part of the joints,then the corrosion difference between the joints welded by TIG welding and MIG welding were simply discussed based on metallographic examination and XRD method. The results show that the surface of the joint welded under the condition of larger current is relatively smooth and uniform,with less the corrosion products,and the grain boundary still maintained a certain continuity. Fine grain size and large amount of precipitated phase distributed at the grain boundary would lead to severe corrosion of the welded joint,which is the main reason for the corrosion difference between the MIG welding and the TIG welding joints treated by acid pickling solution.
引文
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[19]罗检,张勇,钟庆东,等.晶粒度对一些常用金属耐腐蚀性能的影响[J].腐蚀与防护,2012,33(4):349-352.
[2]REN Lingbao,FAN Lingling,ZHOU Mingyang,et al. Magnesium application in railway rolling stocks:A new challenge and opportunity for lightweighting[J]. International Journal of Lightweight Materials and Manufacture,2018,1(2):81-88.
[3]NAKATA Kazuhiro. Weldability of magnesium alloys[J]. JournalofLightMetalWelding&Construction,2001,39(12):26-35.
[4]DONG Honggang,LIAO Chuanqing,YANG Liqun. Microstructure and mechanical properties of AZ31B magnesium alloy gas metal arc weld[J]. Trans Nonferrous Met Soc China,2012,22(6):1336-1341.
[5]ESMAILY M,SVENSSON J E,FAJARDO S,et al. Fundamentals and advances in magnesium alloy corrosion[J]. Progress in Materials Science,2017,89:92-193.
[6]崔建红,吴志生,弓晓园.镁合金焊接接头耐腐蚀性能研究现状[J].铝加工,2014(3):45-48.
[7]DHANAPAL A,BOOPATHY R S,BALASUBRAMANIAN V.Influence of pH value,chloride ion concentration and immersion time on corrosion rate of friction stir welded AZ61A magnesium alloy weldments[J]. Journal of Alloys and Compounds,2012,523:49-60.
[8]PRADEEP KUMAR REDDY G,RATNA SUNIL R B,BALAKRISHNA B. Joining of AZ31 Mg alloy sheets by friction stir welding and investigating corrosion initiated failure[J]. Materials Today:Proceedings,2017,4(6):6712-6717.
[9]宫宁,卜红梅,任祥龙,等.镁合金表面转化膜预处理工艺的研究进展[J].材料导报,2018(S2):315-321.
[10]邢健,程艳艳. AZ31B镁合金点焊焊接接头化学镀镍磷研究[J].兵器材料科学与工程,2015,38(6):58-60.
[11]HESHMATI M,SEIFZADEH D,SHOGHI P,et al. Duplex NiZn-Cu-P/Ni-P electroless coating on magnesium alloy via maleic acid pretreatment[J]. Surface and Coatings Technology,2017,328:20-29.
[12]SEIFZADEH D,KAZEMIMOHSENABADIH,RAJABALIZADEH Z. Electroless Ni-P plating on magnesium alloy by innovative,simple and non-toxic oxalate pretreatment and its corrosion protection[J]. RSC Advances,2016(6):97241-97252.
[13]胡荣,陈英敏.预处理对AZ91D镁合金化学镀镍的影响[J].电镀与精饰,2017(10):35-37.
[14]XIANG Yanghui,HU Wenbin,LIU Xinkuan,et al. A study on surface state during the pretreatment of electroless nickel plating on magnesium alloys[J].Transactions of the Institute of Metal Finishing,2001,79(1):27-29.
[15]刘伟,常立民,孙小.镁合金一步酸洗活化前处理工艺[J].腐蚀与防护,2013,34(6):518-522.
[16]秦铁男,马立群,贺忠臣,等. AZ31变形镁合金化学镀前无铬酸洗工艺研究[J].电镀与环保,2011,31(6):19-22.
[17]BEN-HAMU G,ELIEZER D,CROSS C E,et al. The relation between microstructure and corrosion behavior of GTA welded AZ31B magnesium sheet[J]. Materials Science and Engineering A,2007,452/453:210-218.
[18]白力静,张华,袁颖,等.β-Mg17Al12相含量对AZ91镁合金腐蚀行为的影响[J].西安理工大学学报,2011,27(1):31-35.
[19]罗检,张勇,钟庆东,等.晶粒度对一些常用金属耐腐蚀性能的影响[J].腐蚀与防护,2012,33(4):349-352.