Effect of Environmental Variables on Galvanic Corrosion Performance of Welded Joint of Nuclear Steam Turbine Rotor

doi:10.11902/1005.4537.2020.079

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (3): 318-326 DOI: 10.11902/1005.4537.2020.079

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Effect of Environmental Variables on Galvanic Corrosion Performance of Welded Joint of Nuclear Steam Turbine Rotor

CANG Yu¹, HUANG Yuhui¹(

), WENG Shuo², XUAN Fuzhen¹

^1.East China University of Science and Technology，Key Laboratory of Pressure System and Safety of Ministry of Education，Shanghai 200237, China
^2.University of Shanghai for Science and Technology，Shanghai 200093，China

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Abstract

The effect of chloride ion concentration, dissolved oxygen (DO) concentration and pH value of the water on the galvanic corrosion performance of the weld joint of 25Cr2Ni2MoV steel used for nuclear steam turbine rotor were investigated by means of potentiodynamic polarization measurements and electrochemical impedance spectroscopy. The results reveal that under different environmental variables selected, the welded joints of rotor steel exhibit a certain degree of galvanic corrosion effect, in which weld metal (WM) is preferentially corroded as the anode, and the corrosion resistance of WM and base metal (BM) decreases with the increasing chloride ion concentration, increasing dissolved oxygen content and decreasing pH value. In the environment of low chloride ion concentration (0.035 and 35 mg/L), the electrode process of WM and BM is controlled by ion diffusion, while in other environments, the electrode process is controlled by electrochemical activation. In addition, the increase of chloride ion concentration significantly enhances the galvanic corrosion effect of welded joints. The increase of dissolved oxygen concentration reduces the galvanic corrosion effect of welded joints, while the change of pH value under acidic conditions has no obvious effect on galvanic corrosion effects.

Key words: welded joint galvanic corrosion potentiodynamic polarization electrochemical impedance spectroscopy

Received: 11 May 2020

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51875202)

Corresponding Authors: HUANG Yuhui E-mail: yhhuang@ecust.edu.cn

About author: HUANG Yuhui, E-mail: yhhuang@ecust.edu.cn

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Cite this article:

CANG Yu, HUANG Yuhui, WENG Shuo, XUAN Fuzhen. Effect of Environmental Variables on Galvanic Corrosion Performance of Welded Joint of Nuclear Steam Turbine Rotor. Journal of Chinese Society for Corrosion and protection, 2021, 41(3): 318-326.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.079 OR https://www.jcscp.org/EN/Y2021/V41/I3/318

Table 1 Chemical compositions of 25Cr2Ni2MoV (BM) and WM (mass fraction / %)

Fig.1 Polarization curves (a) and electrochemical parameters (b) of BM and WM in different Cl^- concentrations

Fig.2 Nyquist plots (a, b) and equivalent circuits of (c, d) BM (a, c) and WM (b, d) in different Cl^- concentrations

Table 2 Fitting results of the equivalent circuit of BM and WM in different Cl^- concentrations

Fig.3 Polarization curves (a) and electrochemical parame-ters of BM and WM (b) in different DO concentrations

Fig.4 Nyquist plot of BM and WM in different DO concentrations

Table 3 Fitting results of the equivalent circuit of BM and WM in different DO^{concentrations}

Fig.5 Polarization curves (a) and electrochemical parame-ters (b) of BM and WM in different pH values

Fig.6 Nyquist plot of BM and WM in different pH values

Table 4 Fitting results of the equivalent circuit of BM and WM in different pH values

Fig.7 Polarization curves of WJ in different environmental variables

Table 5 Self-corrosion current density and galvanic effect in different Cl^- concentrations

Table 6 Self-corrosion current density and galvanic effect in different DO concentrations

Table 7 Self-corrosion current density and galvanic effect in different pH values

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