7A52铝合金双丝MIG焊接头的不均匀性对其表面微弧氧化膜腐蚀防护作用的影响

doi:10.11902/1005.4537.2017.191

中国腐蚀与防护学报

2018, Vol. 38

Issue (3): 219-225 DOI: 10.11902/1005.4537.2017.191

研究报告

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7A52铝合金双丝MIG焊接头的不均匀性对其表面微弧氧化膜腐蚀防护作用的影响

郝利新^1,², 贾瑞灵¹(

), 张慧霞², 张伟³, 赵婷¹, 翟熙伟¹

1 内蒙古工业大学材料学院内蒙古自治区薄膜与涂层重点实验室呼和浩特 010051
2 中国船舶重工集团公司第七二五研究所海洋腐蚀与防护国家重点实验室青岛 266101
3 中国科学院金属研究所金属腐蚀与防护实验室沈阳 110016

Influence of Inhomogeneity of Tandem Welding Joint of 7A52 Al-alloy on Protectiveness of Micro-arc Oxidation Films on Its Surface

Lixin HAO^1,², Ruiling JIA¹(

), Huixia ZHANG², Wei ZHANG³, Ting ZHAO¹, Xiwei ZHAI¹

1 Key Laboratory for Thin Film and Coatings of Inner Mongolia Autonomous Region, School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
2 State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao 266101, China
3 Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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摘要:

以装甲用7A52铝合金双丝MIG焊接接头易于腐蚀,需要进行必要的防护为背景,采用金相显微镜、扫描电镜、能谱分析和极化曲线为表征手段,研究了焊缝组织和成分的不均匀性对表面微弧氧化膜腐蚀防护作用的影响。结果表明：焊缝区为树枝状的铸态组织;熔合区靠近焊缝一侧为细小的等轴晶组织,紧邻热影响区一侧为柱状晶;热影响区的组织部分发生了再结晶;母材为典型的轧制态纤维组织。微弧氧化膜在焊缝表面生长速率慢,Mg参与形成焊缝表面的氧化膜,使得氧化膜的钝化性减弱,致密性和均一性变差,其腐蚀防护作用不及母材和热影响区表面氧化膜的。短期浸泡时,焊缝区、热影响区及母材表面微弧氧化膜的腐蚀防护作用差别较小;长期浸泡后,焊缝表面微弧氧化膜的腐蚀防护作用明显不及母材和热影响区的。

关键词 ：铝合金, 双丝MIG焊, 腐蚀, 微弧氧化膜

Abstract：

Taking the susceptibility of the tandem welding joint of 7A52 Al-alloy into account,it is of significance to reveal the effect of the microstructural heterogeneity of the tandem metal inert gas welding joints of 7A52 Al-alloy on the corrosion performance of the micro-arc oxidation (MAO) films prepared on the surface of the weld plate by means of potentiondynamic polarization measurement, OM and SEM with EDS. It follows that the rolling base metal presents a typical fiber-like microstructure. The microstructure of the weld seam is as-cast dendritic structure. Grains in the fusion zone are equiaxed crystallites on the side adjacent to the weld, but are columnar on the other side near the heat-affected zone (HAZ). Recrystallization of grains in the heat affected zone has occurred. The growth rate of the MAO film on the weld seam is slower and Mg can be detected in the film, which may be responsible to the poor compactness and uniformity, and thus the weak passivity of the prepared MAO film, as a result, the protectiveness of the MAO film on the weld seam is worse than that on the HAZ and base metal. In general, for short-term immersion, the difference of the protectiveness of the MAO films on the weld seam, HAZ and base metal is not obvious, however, for long-term immersion, the protectiveness of the MAO film on the weld seam is obviously inferior to that on the HAZ and base metal.

Key words： Al-alloy tandem welding corrosion micro-arc oxidation

收稿日期: 2017-11-16

ZTFLH:

TG174.45

基金资助:内蒙古自然科学基金 (2017MS(LH)0511) 和海洋腐蚀与防护重点实验室开放研究基金 (KF160408)

作者简介:

作者简介郝利新,男,1992年生,硕士生

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引用本文:

郝利新, 贾瑞灵, 张慧霞, 张伟, 赵婷, 翟熙伟. 7A52铝合金双丝MIG焊接头的不均匀性对其表面微弧氧化膜腐蚀防护作用的影响[J]. 中国腐蚀与防护学报, 2018, 38(3): 219-225.
Lixin HAO, Ruiling JIA, Huixia ZHANG, Wei ZHANG, Ting ZHAO, Xiwei ZHAI. Influence of Inhomogeneity of Tandem Welding Joint of 7A52 Al-alloy on Protectiveness of Micro-arc Oxidation Films on Its Surface. Journal of Chinese Society for Corrosion and protection, 2018, 38(3): 219-225.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.191 或 https://www.jcscp.org/CN/Y2018/V38/I3/219

图1 MAO样品及金相样品的截取位置及尺寸

图2 7A52铝合金双丝MIG焊接头的金相显微组织

图3 7A52铝合金双丝MIG焊接头表面MAO膜的SEM像

图4 7A52铝合金双丝MIG焊接头MAO膜截面上EDS分析结果

图5 7A52铝合金焊接接头MAO前后在3.5%NaCl溶液中浸泡不同时间的动电位极化曲线

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