AZ31B和AZ61A镁合金搅拌摩擦焊接头耐腐蚀性能研究
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摘要
对AZ31B和AZ61A两种镁合金一定工艺下搅拌摩擦焊接接头及基体进行了中性室温静态氯化钠浸泡失重实验和动电位极化曲线测试.在该工艺参数下,AZ31B镁合金接头的热影响区和焊缝24 h单位面积失重率分别较母材减少0.944 4和0.455 6 g/m~2,而AZ61A镁合金则为0.1和-0.066 6 g/m~2;极化曲线测得AZ31B镁合金热影响区和焊缝以及母材的腐蚀电位分别为-1.564、-1.508、-1.519 V.而AZ61A镁合金则为-1.543、-1.559、-1.553 V.该搅拌摩擦焊工艺可以获得耐盐水腐蚀性能高于母材的AZ31B镁合金接头.
The corrosion resistance and pitting corrosion resistance of the friction stir welded joints and matrix of AZ31 B and AZ61 A magnesium alloy under a certain processwere investigated. It is found that the 24 h-unit-area weight loss of the AZ31 B magnesium alloy joint can be reduced by 0.944 4 at the heat-affected zone(HAZ) and 0.455 6 g/m~2 at the weld. Meanwhilethe reduction of AZ61 A magnesium alloy is 0.1 and-0.0666 g/m~2, respectively. The potentiodynamic polarization curve shows that the HAZ, weld of the AZ31 B magnesium alloy and the corrosion potential of the base metal are-1.564,-1.508, and-1.519 V respectively.Meanwhile, the AZ61 A magnesium alloys are-1.543,-1.559 and-1.553 V. It is concluded that the AZ31 B magnesium alloy joint with higher saltwater corrosion resistance than the base material can be obtained by the friction stir welding process.
The corrosion resistance and pitting corrosion resistance of the friction stir welded joints and matrix of AZ31 B and AZ61 A magnesium alloy under a certain processwere investigated. It is found that the 24 h-unit-area weight loss of the AZ31 B magnesium alloy joint can be reduced by 0.944 4 at the heat-affected zone(HAZ) and 0.455 6 g/m~2 at the weld. Meanwhilethe reduction of AZ61 A magnesium alloy is 0.1 and-0.0666 g/m~2, respectively. The potentiodynamic polarization curve shows that the HAZ, weld of the AZ31 B magnesium alloy and the corrosion potential of the base metal are-1.564,-1.508, and-1.519 V respectively.Meanwhile, the AZ61 A magnesium alloys are-1.543,-1.559 and-1.553 V. It is concluded that the AZ31 B magnesium alloy joint with higher saltwater corrosion resistance than the base material can be obtained by the friction stir welding process.
引文
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[2]陈振华.变形镁合金(精)[M].北京:化学工业出版社,2005.
[3]YUSIRONG,CHENXIANJUN,HUANGZHIQIU,et al.Microstructure and mechanical properties of friction stir welding of AZ31B magnesium alloy added with cerium[J].Journal of Rare Earths,2010,28(2):316-320.
[4]张汉茹,郝远.AZ91D镁合金在含Cl-溶液中腐蚀机理的研究[J].铸造设备与工艺,2007,(3):19-23.
[5]NAKATA K.Friction stir welding of magnesium alloys[J].Welding International,2009,23(5):328-332.
[6]宋晓村,朱政强,陈燕飞.搅拌摩擦焊的研究现状及前景展望[J].热加工工艺,2013,42(13):5-7.
[7]沈长斌,杨野,陈影.AZ31镁合金搅拌摩擦焊焊缝电化学性能的分析[J].焊接学报,2014,35(9):101-104.
[8]李凌杰,于生海,雷惊雷,等.AZ31和AZ61镁合金在模拟海水中的腐蚀电化学行为[J].电化学,2008(2):97.
[9]孙转平.镁合金几种不同焊接接头的腐蚀行为及其防护[D].长春:吉林大学,2010.