Intergranular Corrosion Behavior of Friction Stir Welded Joints of Semi-solid 7075 Al-alloy

doi:10.11902/1005.4537.2024.328

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (4): 1089-1097 DOI: 10.11902/1005.4537.2024.328

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Intergranular Corrosion Behavior of Friction Stir Welded Joints of Semi-solid 7075 Al-alloy

DING Zhichao, ZHANG Shuguo(

), XIAO Xiaochun, WANG Di, LI Wenjie, JIANG Lihong

School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China

Cite this article:

DING Zhichao, ZHANG Shuguo, XIAO Xiaochun, WANG Di, LI Wenjie, JIANG Lihong. Intergranular Corrosion Behavior of Friction Stir Welded Joints of Semi-solid 7075 Al-alloy. Journal of Chinese Society for Corrosion and protection, 2025, 45(4): 1089-1097.

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Abstract

The intergranular corrosion behavior of friction stir welded joints of semi-solid 7075 Al-alloy in solution of 10 mL H₂O₂ + 57 g NaCl + 1000 mL H₂O was assessed by means of immersion test, optical microscope, scanning electron microscope (SEM) and energy spectroscopy (EDS) etc. The results show that the entire welded joint can be differentiated as four zones: the base metal (BM) zone, the heat-affected (HAZ) zone, the thermo-mechanically affected (TMAZ) zone and the nuclear weld (NZ) zone. Among them, the corrosion degree of the weld center (NZ) is the lightest, the heat-affected (HAZ) zone is the most serious; while the corrosion degree of the four zones of the weld joint may be ranked in an order from low to high as follows NZ < BM < TMAZ < HAZ. In general, with the increase of corrosion time, the corrosion forms of every zone of the friction stir welded joint of semi-solid 7075 Al-alloy conform to the same characteristics of pitting corrosion, intergranular corrosion and spalling corrosion. The difference of corrosion performance of different zones of semi-solid 7075 Al-alloy friction stir welded joints may be attributed to the different microstructure and distribution of second-phase particles in various zones of the joint.

Key words: semi-solid 7075 Al-alloy friction stir welding intergranular corrosion corrosion mechanism

Received: 09 October 2024 32134.14.1005.4537.2024.328

ZTFLH:

TG457.1

Fund: National Natural Science Foundation of China(52105451);National Natural Science Foundation of China(52465045)

Corresponding Authors: ZHANG Shuguo, E-mail: zsg89@nchu.edu.cn

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	DING Zhichao
	ZHANG Shuguo
	XIAO Xiaochun
	WANG Di
	LI Wenjie
	JIANG Lihong

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.328 OR https://www.jcscp.org/EN/Y2025/V45/I4/1089

Fig.1 Rheological squeeze casting forming 7075 Al-alloy virgin material: (a) virgin casting, (b, c) pre-finished material, (d) welded plate

Fig.2 Experimental stirring needle

Fig.3 Welding test specimen

Fig.4 Macroscopic morphologies of various zones of semi-solid 7075 Al-alloy welded joint after intergranular corrosion for 1 h (a), 2 h (b), 4 h (c) and 6 h (d)

Fig.5 Measurements of intergranular corrosion depths for different zones of the welded joint after corrosion for 6 h: (a) BM, (b) HAZ, (c) TMAZ, (d) NZ

Fig.6 Optical photographs (a-d) and SEM microstructures (e-h) of different zones of semi-solid 7075 Al-alloy welded joint: (a) BM, (b) HAZ, (c) TMAZ, (d) NZ

Fig.7 Micro-morphologies of the BM of the welded joint after intergranular corrosion for 1 h (a), 2 h (b), 4 h (c) and 6 h (d)

Fig.8 Micro-morphologies of the HAZ of welded joint after intergranular corrosion for 1 h (a), 2 h (b), 4 h (c) and 6 h (d)

Fig.9 Micro-morphologies of the TMAZ of welded joint after intergranular corrosion for 1 h (a), 2 h (b), 4 h (c) and 6 h (d)

Fig.10 Micro-morphologies of the NZ of welded joint after intergranular corrosion for 1 h (a), 2 h (b), 4 h (c) and 6 h (d)

Table 1 EDS determined compositions of the marked points in Fig.11

Fig.11 EDS analysis results of the marked points for the welded joint after intergranular corrosion for 4 h

Fig.12 Corrosion process diagram: (a) erosion initiation stage, (b) early stages of corrosion development, (c)mid-corrosion

Fig.13 XRD pattern of semi-solid 7075 Al-alloy after intergranular corrosion for 4 h

Fig.14 Sketch of corrosion process

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