Corrosion Behavior of H62 Brass Alloy/TC4 Titanium Alloy Welded Specimens

doi:10.11902/1005.4537.2019.012

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (2): 159-166 DOI: 10.11902/1005.4537.2019.012

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Corrosion Behavior of H62 Brass Alloy/TC4 Titanium Alloy Welded Specimens

BAI Miaomiao¹^,², BAI Ziheng¹^,², JIANG Li¹^,², ZHANG Dongjiu³, YAO Qiong³, WEI Dan⁴, DONG Chaofang¹^,², XIAO Kui¹^,²(

)

1 Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2 Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
3 China Xichang Satellite Launch Center Key Laboratory of Reliability Technology for Space Launch Site, Haikou 571000, China
4 Service Center for China Science and Technology Association, Beijing 100081, China

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Abstract

The corrosion behavior of vacuum diffusion welded component of H62 brass and TC4 Ti-alloy in 3.5% (mass fraction) NaCl solution for up to 24 h was investigated by means of immersion test, scanning Kelvin probe test, scanning electron microscopy attached with EDS and X-ray photoelectron spectroscopy. The results demonstrate that the weld seam width of the jointed H62 brass and TC4 Ti-alloy is about 25~30 μm, and the free corrosion potential of H62 brass is slightly higher than that of TC4 Ti-alloy at the initial stage of immersion test. However, with the prolongation of immersion time, the free corrosion potential of TC4 Ti-alloy turns to be higher than that of H62 brass, and the corrosion of the area of H62 brass, where closed to TC4 Ti-alloy is much more severe than that, where far away from the weld seam. The corrosion products of H62 brass after immersion test composed mainly of CuO, Cu₂O, CuCl, CuCl₂ and Cu(OH)₂, while the scale on TC4 Ti-alloy composed mainly of Ti-oxides TiO₂ and Ti₂O₃. The welded couple of H62 brass/TC4 Ti-alloy exhibits galvanic corrosion tendency in 3.5%NaCl solution, and the H62 brass acts as anode in the galvanic couple, which correspondingly underwent accelerated corrosion process.

Key words: vacuum diffusion welding galvanic corrosion scanning Kelvin probe immersion test brass Ti

Received: 14 January 2019

ZTFLH:

TG172.5

Fund: National Natural Science Foundation of China(51671027);National Key R&D Program of China(2017YFB0304602);National Materials Environmental Corrosion Platform (NECP)

Corresponding Authors: XIAO Kui E-mail: xiaokui@ustb.edu.cn

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	Miaomiao BAI
	Ziheng BAI
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	Qiong YAO
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	Chaofang DONG
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Cite this article:

BAI Miaomiao, BAI Ziheng, JIANG Li, ZHANG Dongjiu, YAO Qiong, WEI Dan, DONG Chaofang, XIAO Kui. Corrosion Behavior of H62 Brass Alloy/TC4 Titanium Alloy Welded Specimens. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 159-166.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.012 OR https://www.jcscp.org/EN/Y2020/V40/I2/159

Fig.1 Diagram of SKP line scanning zone of test sample

Fig.2 SEM image of diffusion welding zone (a) and elem-ent distributions along the line acrossing the welding zone in Fig.2a (b)

Fig.3 Metallurgical structure of diffusion welding zone

Fig.4 Variations of SKP potentials of H62 brass alloy and TC4 titanium alloy in the welding zone of diffusion welding specimen after immersion in 3.5%NaCl solution for different time

Fig.5 Corrosion morphologies of H62 brass alloy and TC4 titanium alloy in the welding zone of diffusion welding specimen after immersion in 3.5%NaCl solution for 2 h (a), 4 h (b), 8 h (c), 12 h (d) and 24 h (e)

Fig.6 SEM images of different zones of the diffusion welding specimen after corrosion for 24 h, (a) H62 brass alloy near the welding zone, (b) H62 brass alloy far away from the welding zone, (c) TC4 titanium alloy

Fig.7 XPS survey spectrum of the surface of H62 brass alloy after immersion in 3.5%NaCl solution for 24 h

Fig.8 XPS high-resolution spectra of the surface of H62 brass alloy after immersion in 3.5%NaCl solution for 24 h: (a) Cu 2p, (b) Zn 2p, (c) O 1s, (d) Cl 2p

Fig.9 XPS survey spectrum of the surface of TC4 titanium alloy after immersion in 3.5%NaCl solution for 24 h

Fig.10 XPS high-resolution spectra of the surface of TC4 titanium alloy after immersion in 3.5%NaCl solution for 24 h， (a) Ti 2p, (b) O 1s

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