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Journal of Chinese Society for Corrosion and protection  2023, Vol. 43 Issue (1): 202-208    DOI: 10.11902/1005.4537.2021.357
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AC Corrosion Behavior of Several Metallic Materials as Candidate for Boiler Electrode
ZHENG Zhong1, ZHOU Yuanxiang1,2(), LI Yongyin1
1.Wind Solar Storage Division of State Key Laboratory of Power System and Generation Equipment, School of Electrical Engineering, Xinjiang University, Urumqi 830047, China
2.State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
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Corrosion resistance of electrode materials is an important factor affecting energy consumption and service life of electrode boiler. In this paper, the corrosion resistance of titanium, 304 stainless steel and 20# steel as candidate electrode materials was assessed by controlling the applied current density to simulate the working condition of electrode boiler. The corrosion rate, polarization potential and conductivity of the three electrode materials were measured before and after corrosion in different concentrations of trisodium phosphate solution by different applied voltages. The results show that the corrosion current density of 20# steel is about 4 and 20 times higher than that of 304 stainless steel and titanium respectively. Loose corrosion products are generated on the surface of 20# steel electrode, and thus its corrosion resistance is the worst. Results of comparative tests show that titanium electrode has the best corrosion resistance, but its price is high; 304 stainless steel cannot completely be passivated by 500 A/m2 AC interference, thereby pitting corrosion occurs on its surface. By taking comprehensively the corrosion resistance, conductivity and economy into consideration, stainless steel may be the suitable candidate as electrode material in the case of long boiler life expectancy.

Key words:  electrode boiler      AC corrosion      high voltage electrode      trisodium phosphate solution      passive film     
Received:  16 December 2021     
ZTFLH:  TG174  
Corresponding Authors:  ZHOU Yuanxiang, E-mail:   

Cite this article: 

ZHENG Zhong, ZHOU Yuanxiang, LI Yongyin. AC Corrosion Behavior of Several Metallic Materials as Candidate for Boiler Electrode. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 202-208.

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Fig.1  Electrode corrosion system
Fig.2  Electrochemical measuring apparatus (a) electrode corrosion potential measurement circuit, (b) polarization curve measurement circuit
Fig.3  Macro morphologies after corrosion of titanium electrodes (a), 304 stainless steel electrodes (b) and 20# steel electrodes (c)
Fig.4  Macro morphology after rust removal of 20# steel electrodes
Fig.5  Corrosion rate of electrodes with different corrosion duration of titanium electrode, 304 stainless steel electrode and 20# steel electrode
Fig.6  Current of each electrode at 100 ℃, 0.003 mol/L trisodium phosphate solution
Fig.7  Temperature current fitting of corroded 360 h electrode of titanium electrode, 304 stainless steel electrode and 20# steel electrode
Fig.8  Corrosion rate of titanium electrode (a), 304 stainless steel electrode (b) and 20# steel electrode (c) under different voltages and concentrations
Fig.9  SEM images of titanium electrode (a, b), 304 stainless steel electrode (c, d) and 20# steel electrode (e, f)
Fig.10  Electrode potential under 500 A/m2 AC interference of titanium electrode (a), 304 stainless steel electrode (b) and (c) 20# steel electrode
Fig.11  Polarization curves under 500 A/m2 AC interference of titanium electrode (a), 304 stainless steel electrode (b) and (c) 20# steel electrode
ElectrodeEcorr / Vba / V·dec-1bc / V·dec-1Icorr / A·cm-2
304 stainless steel-0.1050.15521-0.339221.1×10-4
20# steel-0.4350.19437-0.338734.2×10-4
Table 1  Polarization curve fitting data of titanium electrode 304 stainless steel electrode and 20# steel electrode
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