Corrosion Property of Nuclear Grade 316LN Stainless Steel Weld Joint in High Temperature and High Pressure Water

doi:10.11902/1005.4537.2018.023

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (2): 106-113 DOI: 10.11902/1005.4537.2018.023

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Corrosion Property of Nuclear Grade 316LN Stainless Steel Weld Joint in High Temperature and High Pressure Water

Zhaodeng LI,Zhendong CUI,Xiangyu HOU,Lili GAO,Weizhen WANG(

),Jianhua YIN

The Institute of Seawater Desalination and Multipurpose Utilization, Ministry of Natural Resources, Tianjin 300192, China

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Abstract

The corrosion performance of weld joints of nuclear grade stainless steel in high temperature and high pressure water was investigated by means of mass change measurement, scanning electron microscope (SEM), X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS). The results showed that, in the initial stage before 340 h, the weld joints suffered from mass loss with a relative high rate, then the mass loss turned to decrease gradually, finally the weld joint exhibited a little mass gain when the test reached 1080 h and hereafter the mass gain kept at a stale level. The oxide scale formed on the weld joints consisted of FeOOH, FeCr₂O₄ and Fe₃O₄ primarily. In conclusion, the weld seam of 316LN stainless steel exhibited an equivalent resistance to uniform corrosion as the base metal.

Key words: stainless steel weld joint corrosion high temperature and pressure water XPS

Received: 07 February 2018

ZTFLH:

TG142.71

Fund: Supported by National Key R&D Program of China(2017YFC0404100);Special Fund of the State Reree-science Arcl Research Institude(K-JBYWF-2016-G4);Special Fund of the State Reree-science Arcl Research Institude(K-JBYWF-2016-T04)

Corresponding Authors: Weizhen WANG E-mail: wangweizhen1628@163.com

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Cite this article:

Zhaodeng LI,Zhendong CUI,Xiangyu HOU,Lili GAO,Weizhen WANG,Jianhua YIN. Corrosion Property of Nuclear Grade 316LN Stainless Steel Weld Joint in High Temperature and High Pressure Water. Journal of Chinese Society for Corrosion and protection, 2019, 39(2): 106-113.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2018.023 OR https://www.jcscp.org/EN/Y2019/V39/I2/106

Table 1 Chemical compositions of weld and base metal

Fig.1 Cross-section overall appearance of 316LN stainless steel weld joint and sample cutting position

Fig.2 Optical (a, b) and local orientation mismatch (c, d) images of base metal (a, c) and weld metal (b, d) in 316LN stainless steel weld joint, respectively

Fig.3 Mass gain (a) and mass gain rate (b) of 316LN stainles steel weld joint

Fig.4 SEM images of typical surface morphologies of the oxide films formed on the 316LN stainles steel weld joint after corrosion for 50 h (a), 200 h (b), 360 h (c), 760 h (d), 1080 h (e) and 1440 h (f)

Fig.5 Surface morphologies of the oxide films formed on base metal (a, c) and weld metal (b, d) after corrosion for 360 h (a, b) and 1440 h (b, d)

Table 2 Chemical compositions of oxide particles marked in Fig.5

Fig.6 XRD patterns of weld and base metals of 316LN stainless steel weld joint after corrosion for different time

Fig.7 XPS fine spectra of Fe (a), Cr (b), Ni (c) and Mo (d) of the oxide films formed on weld and base metals of 316LN weld joint after corrosion for 360 h

Fig.9 XPS fine spectra of the oxide films formed on weld and base metals of 316LN weld joint after corrosion for 360 h (a) and 1440 h (b)

Fig.8 XPS fine spectra of Fe (a), Cr (b), Ni (c) and Mo (d) of the oxide films formed on weld and base metals of 316LN weld joint after 1440 h immersion

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