7075厚板铝合金搅拌摩擦焊接头晶间腐蚀行为研究

doi:10.11902/1005.4537.2016.030

中国腐蚀与防护学报

2017, Vol. 37

Issue (3): 293-299 DOI: 10.11902/1005.4537.2016.030

本期目录 | 过刊浏览

7075厚板铝合金搅拌摩擦焊接头晶间腐蚀行为研究

刘德强^1,²,柯黎明^1,³(

),徐卫平¹,邢丽¹,毛育青³

1 南昌航空大学航空制造工程学院南昌 330063
2 江铃控股有限公司南昌 330052
3 西北工业大学凝固技术国家重点实验室西安 710072

Intergranular Corrosion Behavior of Friction-stir Welding Joint for 20 mm Thick Plate of 7075 Al-alloy

Deqiang LIU^1,²,Liming KE^1,³(

),Weiping XU¹,Li XING¹,Yuqing MAO³

1 School of Aeronautical Manufacturing and Engineering, Nanchang Hangkong University, Nanchang 330063, China
2 Jiangling Holdings Co., Ltd., Nanchang 330052, China
3 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

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摘要:

对20 mm厚7075铝合金搅拌摩擦焊 (FSW) 接头沿板厚方向进行分层晶间腐蚀行为研究。借助光学显微镜及扫描电子显微镜分析了接头组织、第二相成分及分布、腐蚀深度及接头各区腐蚀形貌。结果表明：焊缝中心区腐蚀程度最轻,热机影响区 (TMAZ) 次之,热影响区 (HAZ) 腐蚀程度最严重;沿板厚向下,焊核区 (NZ) 腐蚀程度逐渐变大,TMAZ腐蚀程度先变大后减小,HAZ腐蚀程度逐渐减小;接头沿板厚方向晶粒大小和第二相粒子尺寸及分布存在差异,是造成沿板厚方向各区不同晶间腐蚀程度的主要原因。

关键词 ：搅拌摩擦焊, 厚板, 7075铝合金, 晶间腐蚀, 第二相

Abstract：

The intergranular corrosion behavior of friction-stir welding (FSW) joint for 20 mm thick plate of 7075 Al-alloy was investigated in solution of 57 g NaCl+1000 mL H₂O+10 mL H₂O₂ corresponding to the national standard GBT7998-2005. The microstructure of welded joint, the composition and distribution of the second phase, corrosion depth and corrosion morphology of different zones of the weld joint were characterized by optical microscope and scanning electron microscope. The results show that the corrosion severity of the center zones of the weld joint is the lightest. The corrosion severity of the thermal mechanical affected zone (TMAZ) is between that of the center zones and heat affected zone (HAZ). Downward along the thickness direction of the weld joint, the corrosion severity of the nugget zone (NZ) gradually increased, while that of the TMAZ increased first and then decreased, and that of the HAZ gradually decreased. The difference in the size and the distribution of the second phase and in the grains size of the weld joint along the thickness direction may be the main factor which caused the different corrosion severity for different zones along the thickness direction of the weld joint.

Key words： FSW heavy plate 7075 Al-alloy intergranular corrosion the second phase

收稿日期: 2016-03-09

基金资助:国家自然科学基金 (51265043和51364037) 及航空科学基金 (20140956003)

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引用本文:

刘德强,柯黎明,徐卫平,邢丽,毛育青. 7075厚板铝合金搅拌摩擦焊接头晶间腐蚀行为研究[J]. 中国腐蚀与防护学报, 2017, 37(3): 293-299.
Deqiang LIU, Liming KE, Weiping XU, Li XING, Yuqing MAO. Intergranular Corrosion Behavior of Friction-stir Welding Joint for 20 mm Thick Plate of 7075 Al-alloy. Journal of Chinese Society for Corrosion and protection, 2017, 37(3): 293-299.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.030 或 https://www.jcscp.org/CN/Y2017/V37/I3/293

图1 晶间腐蚀试样截取示意图

图2 7075铝合金焊接接头横截面宏观形貌

图3 沿板厚方向各层试样上表面晶间腐蚀宏观形貌

图4 3#试样各区晶间腐蚀显微形貌

表1 沿板厚方向试样各层各区晶间腐蚀深度

图5 3#试样各区晶间腐蚀深度测量图

图6 1#,3#和5#试样沿焊缝厚度方向水平面不同区域微观组织形貌

图7 1#试样各区第二相分布

表2 第二相粒子成分分析

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