Effect of Salt Spray Environment on Performance of 1Cr18Ni9Ti Brazed Joint

doi:10.11902/1005.4537.2022.385

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (6): 1312-1318 DOI: 10.11902/1005.4537.2022.385

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Effect of Salt Spray Environment on Performance of 1Cr18Ni9Ti Brazed Joint

LIAO Minxing¹, LIU Jun², DONG Baojun³, LENG Xuesong¹, CAI Zelun¹, WU Junwei³, HE Jianchao¹(

)

^1.Institute of Special Environments Physical Sciences, Harbin Institute of Technology, Shenzhen 518055, China
^2.Shanghai Engineering Research Center of Space Engine, Shanghai 201112, China
^3.School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China

Cite this article:

LIAO Minxing, LIU Jun, DONG Baojun, LENG Xuesong, CAI Zelun, WU Junwei, HE Jianchao. Effect of Salt Spray Environment on Performance of 1Cr18Ni9Ti Brazed Joint. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1312-1318.

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Abstract

1Cr18Ni9Ti is brazed with BNi-2 thin strip filler metal. The microstructure, electrochemical characteristics, and hardness and tensile properties of the joint are assessed. While the evolution of the microstructure and mechanical properties of the joint is examined after salt spray corrosion test. The results show that the 1Cr18Ni9Ti brazed joint is well formed, and the microhardness of the weld is significantly higher than that of the base metal on both sides. The tensile strength of the welded joint reaches 500 MPa. The corrosion potential of the weld seam is higher than that of 1Cr18Ni9Ti base metal, and thus the joint is subject to galvanic corrosion in the salt spray environment. The observation results show that the fracture of the uncorroded brazed joint occurs at the adjacent base metal, and the fracture analysis shows that during tensile process, cracks may firstly initiate at the brazing solder, and then cracks propagate to the base metal, and finally fracture occurs. The fractured surface exhibits obvious features of plastic deformation. After salt spray corrosion test, the mechanical properties of the 1Cr18Ni9Ti brazed joint decreased, and the fracture occurred at the interface of brazed joint/base metal after the tensile test, but without characteristics of plastic deformation.

Key words: welded joints brazing galvanic corrosion microstructure mechanical property

Received: 06 December 2022 32134.14.1005.4537.2022.385

ZTFLH:

TG174

Fund: Core Technology Research and Engineering Verification of Development and Reform Commission of Shenzhen Municipality(202100037)

Corresponding Authors: HE Jianchao, E-mail: hejianchao@hit.edu.cn

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	LIAO Minxing
	LIU Jun
	DONG Baojun
	LENG Xuesong
	CAI Zelun
	WU Junwei
	HE Jianchao

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.385 OR https://www.jcscp.org/EN/Y2023/V43/I6/1312

Table 1 Micro-hardness of 1Cr18Ni9Ti alloy brazing joint (HV)

Fig.1 Topography of tensile property specimen size (unit: mm)

Fig.2 Tafel polarization curve results of three samples measured in 5% NaCl solution: (a) polarization curve, (b) E_B/V, (c) corrosion current, (d) corrosion potential

Fig.3 Microcell electrochemical results of 1Cr18Ni9Ti brazed joints in 5%NaCl solution

Fig.4 Microstructure of 1Cr18Ni9Ti alloy brazing specimen after welding: (a) low magnification metallographic structure of weld, (b) metallographic structure of base metal, (c) high magnification metallographic structure of weld

Fig.5 Element distribution of 1Cr18Ni9Ti alloy brazed joints: (a) mapping, (b) line scan

Fig.6 3D morphology of 1Cr18Ni9Ti brazed joints after salt spray corrosion: (a1, a2) 1 d, (b1, b2) 3 d, (c1, c2) 6 d, (d1, d2) 10 d, (e1, e2) 15 d, (f1, f2) 20 d

Fig.7 Height difference of 1Cr18Ni9Ti brazed joint after salt spray corrosion

Fig.8 Stress-strain curve of 1Cr18Ni9Ti brazed joint tensile specimen: (a) before corrosion, (b) corrosion for 10 d, (c) corrosion for 20 d

Fig.9 Macro morphology of tensile samples of 1Cr18Ni9Ti brazed joints before corrosion (a), after corrosion for 10 d (b) and after corrosion for 20 d (c)

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