Corrosion Resistance and Environmentally-friendly Chemical Passivation of Welded Joints for Ultra-low Carbon Austenitic Stainless Steel

doi:10.11902/1005.4537.2019.054

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (4): 345-352 DOI: 10.11902/1005.4537.2019.054

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Corrosion Resistance and Environmentally-friendly Chemical Passivation of Welded Joints for Ultra-low Carbon Austenitic Stainless Steel

SUN Xiaoguang¹(

),HAN Xiaohui¹,ZHANG Xingshuang²,ZHANG Zhiyi¹,LI Gangqing¹,DONG Chaofang²

1. Technical Engineering Department, CRRC Qingdao Sifang Co. , Ltd. , Qingdao 266111, China
2. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China

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Abstract

Plates of ultra-low carbon austenitic stainless steel 304L were welded by manual arc welding and argon arc welding respectively with 316L stainless steel as filler. The welded joints were characterized by means of electron backscatter diffraction (EBSD) and X-ray diffraction (XRD). Whilst the welded joints were chemically passivated in 10% and 20% hydrogen peroxide solutions respectively, then their corrosion behavior was examined via electrochemical means and X-ray photoelectron spectroscopy (XPS). Results showed that the pitting potential of the weld zone was the highest due to the incorporation of 316L stainless steel welding wire. The corrosion resistance of the matrix was relatively good because its inherent microstructure of relatively uniform and small grains. The heat affected zone has coarse grains and/or mixed grain structure, so that its pitting potential was the lowest, correspondingly its corrosion resistance was the worst. In a word, the welded joints of austenitic stainless steel 304L had the best corrosion resistance, when they were passivated in 10% hydrogen peroxide solution for 15 min.

Key words: ultralow carbon austenitic stainless steel welded joint chemical passivation corrosion resistance

Received: 01 May 2019

ZTFLH:

TG178

Fund: Supported by National Key Research and Development Program of China(2017YFB0702300);National Environmental Corrosion Platform of China(2005DKA10400);National Natural Science Foundation of China(51871028)

Corresponding Authors: Xiaoguang SUN E-mail: sunx_sf@126.com

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	Xiaoguang SUN
	Xiaohui HAN
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	Zhiyi ZHANG
	Gangqing LI
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Cite this article:

SUN Xiaoguang,HAN Xiaohui,ZHANG Xingshuang,ZHANG Zhiyi,LI Gangqing,DONG Chaofang. Corrosion Resistance and Environmentally-friendly Chemical Passivation of Welded Joints for Ultra-low Carbon Austenitic Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2019, 39(4): 345-352.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.054 OR https://www.jcscp.org/EN/Y2019/V39/I4/345

Table 1 Chemical compositions of 304L and 316L stainless steels (mass fraction / %)

Table 2 Manual arc welding parameters of 304L stainless steel

Fig.1 Welded joint schematic of 304L stainless steel

Fig.2 EBSD images of welded joints of 304L stainless steel after welding by 304L-HD (a) and 304L-HWS (b)

Fig.3 XRD spectra of welded joints of 304L stainless steel after two different welding processes

Fig.4 Potentiodynamic polarization curves of welded joints of 304L stainless steel after welding by 304L-HD (a) and 304L-HWS (b)

Fig.5 Corrosion morphologies of welded joints of 304L stainless steel after salt spray test for 1 d: (a) BM (HD), (b) WZ (HD), (c) HAZ (HD), (d) BM (HWS), (e) WZ (HWS), (f) HAZ (HWS)

Fig.6 Potentiodynamic polarization curves of the matrix (a), weld zone (b) and heat affected zone (c) of 304L stainless steel after manual arc welding and then chemical passivation

Fig.7 Pit potentials of the matrix (BM), weld zone (WZ) and heat affected zone (HAZ) of HD welded joint of 304L stainless steel after chemical passivation

Fig.8 Potentiodynamic polarization curves of the matrix (a), weld zone (b) and heat affected zone (c) of 304L stainless steel after HWS welding and then chemical passivation

Fig.9 Pit potentials of the matrix, weld zone and heat affected zone of HWS welded joint 304L stainless steel after chemical passivation

Fig.10 XPS full spectrum and fine spectra of Cr 2p_3/2 (a), Fe 2p_3/2 (b) and O 2p (c) for the surface film form-ed on 304L stainless steel after chemical passivati-on in the solution containing 10%H₂O₂

Fig.11 XPS full spectrum and fine spectra of Cr 2p_3/2 (a), Fe 2p_3/2 (b) and O 2p (c) for the surface film formed on 304L stainless steel after chemical passivation in the solution containing 20%H₂O₂

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