紫外光对铝合金焊接接头腐蚀行为的影响

龚利华; 郭为民

doi:10.12073/j.hjxb.20210827002

紫外光对铝合金焊接接头腐蚀行为的影响

龚利华¹,
郭为民²

1.
江苏科技大学, 镇江, 212003
2.
中国船舶重工集团公司第七二五研究所, 海洋腐蚀与防护重点实验室, 青岛, 266237

基金项目: 海洋腐蚀与防护重点实验室开放研究基金项目(KF190409)

详细信息

作者简介:
龚利华，硕士，教授；主要研究方向为金属材料的腐蚀与防护；Email: gonglihua606@just.edu.cn

中图分类号: TG 457.14
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- 文章访问数: 279
- HTML全文浏览量: 27
- PDF下载量: 37
出版历程
- 收稿日期: 2021-08-26
- 网络出版日期: 2022-04-28
- 刊出日期: 2022-04-24

Effect of UV light on the corrosion behaviors of aluminum alloy welded joints

GONG Lihua¹,
GUO Weimin²

1.
Jiangsu University of Science and Technology, Zhenjiang, 212003, China
2.
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao, 266237, China

摘要

摘要: 通过光学显微镜分析研究了6061铝合金熔化极惰性气体保护焊(metal inter gas welding, MIG焊)和搅拌摩擦焊(friction stir welding, FSW)对接头组织的影响.结合极化曲线测试，比较了紫外光照射与暗态对预沉积NaCl的基材及焊接接头腐蚀行为影响的差异.结果表明，MIG焊接头组织均匀性较差，焊缝Mg含量远高于母材，使得表现出较差的热力学稳定性.紫外光照射加速了铝合金焊接接头的腐蚀，尤其是明显加速了MIG焊接头的腐蚀.30天的紫外光照射对FSW接头的影响与母材相近.这些影响与材料本身的耐腐蚀性能及铝合金表面形成的半导体性质腐蚀产物密切有关.
- 紫外光 /
- 铝合金 /
- 焊接接头 /
- 腐蚀行为
Abstract: The effects of metal inert gas (MIG) welding and friction stir welding (FSW) on the microstructure of 6061 aluminum alloy were studied by OM. Meanwhile, combined with the polarization curves test, the corrosion behaviors of the base metal and welded joints of pre-deposited NaCl after exposure under ultraviolet light (UV) irradiation and in the dark were compared. The results showed that the uniformity of the MIG welded joint microstructure was poor, and the content of Mg in weld zone was much higher than that in base metal. So the MIG welded joint showed the poor thermodynamic stability. UV irradiation could accelerate the corrosion rate of the base metal and the welded joints, in particular, the MIG welded joint was significantly affected. The effect of 30 days UV irradiation on the FSW joint was similar to that of the base metal. These effects are closely related to the corrosion resistance of the material and the corrosion products of semiconductor properties formed on the surface of the aluminum alloy.
- ultraviolet light /
- aluminum alloy /
- welded joints /
- corrosion behaviors

HTML全文

图 1 MIG焊接头的组织全貌

Figure 1. Overview microstructure of MIG welded joint

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图 2 MIG焊接头的组织形貌

Figure 2. Microstructure morphologies of MIG welded joints. (a) BM; (b) WZ; (c) HAZ

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图 3 FSW 焊接接头组织形貌

Figure 3. Microstructure morphologies of FSW joints. (a) NZ; (B) TMAZ; (c) HAZ

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图 4 在紫外光照射下母材及其焊接接头腐蚀7和30 d后去除腐蚀产物的表面形貌

Figure 4. Surface morphologies of base metal and the welded joints removing corrosion products after 7 and 30 d exposure under UV irradiation. (a) BM-7 d; (b) MIG welded joints-7 d; (c) FSW joints-7 d; (d) BM-30 d; (e) MIG welded joints-30 d; (f) FSW joints-30 d

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图 5 在暗态下母材及其焊接接头腐蚀7和30 d后去除腐蚀产物的表面形貌

Figure 5. Morphologies of base metal and the welded joints removing corrosion products after 7 and 30 d exposure in the dark. (a) BM-7d; (b) MIG welded joints-7d; (c) FSW joints-7 d; (d) BM-30 d; (e) MIG welded joints-30 d; (f) FSW joints-30 d

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图 6 在紫外光照射和暗态下母材和焊接接头的极化曲线

Figure 6. Polarization curves of the base metal and welded joints under UV irradiation and in the dark. (a) before corrosion; (b) UV irradiation 30 d; (c) dark 30 d

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表 1 6061-T6铝合金和ER5356焊丝化学成分(质量分数，%)

Table 1 Chemical composition of the base metal and ER5356 welding wire

材料	Mg	Si	Fe	Cu	Mn	Cr	Zn	Ti	Al
6061-T6	0.90	0.46	0.40	0.19	0.05	0.20	0.01	0.04	余量
ER5356	4.88	0.03	0.168	0.007	0.141	0.132	0.002	0.105	余量

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表 2 母材和焊接接头腐蚀30 d后的自腐蚀电位E_c和点蚀电位E_b (V)

Table 2 Corrosion potential (E_c) and pitting potential (E_b) of the base metal and welded joints

试样	腐蚀前	紫外光照射		暗态
试样	腐蚀前	E_c	E_b	E_c	E_b
母材	−0.617	−0.587	−0.546	−0.609	−0.603
MIG焊接头	−0.728	−0.568	−0.563	−0.665	−0.588
FSW接头	−0.646	−0.552	−0.547	−0.567	−0.558

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