Comparison of Corrosion Protection Measures of Grounding Grids for Electric Power Station

Journal of Chinese Society for Corrosion and protection

2013, Vol. 33

Issue (6): 501-506 DOI:

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Comparison of Corrosion Protection Measures of Grounding Grids for Electric Power Station

LIN Yonghua¹, ZHANG Xuefeng², HAN Li³, ZHANG Lanhe²

1. Harbin Electric Power Vocational Technology College, Harbin 150030, China;
2. School of Chemical Engineering, Northeast Dianli University, Jilin 132012, China;
3. Ningxia Electric Power Research Institute, Yinchuan 750011, China

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Abstract In order to prolong the service life of grounding grid for electric power station, the corrosion rate of grid without and with protection measures was evaluated by weight-loss method and electrochemical method respectively. The advantages and disadvantages of corrosion inhibitor, sacrificial anode cathodic protection and combined measure of corrosion inhibitor and sacrificial anode cathodic protection are compared and analyzed. The results show that three inhibitors of 1% of Na₂MoO₄, 2% of (NaPO₃)₆ and 4% of Na₂SiO₃ all show good efficiency in corrosion inhibition on Q235 steel grounding grid. The corrosion rate of grounding grid nearly decreased to 0.1200 mm/a with an inhibition efficiency about 70%. When (NaPO₃)₆+Na₂MoO₄ is used as mixed inhibitor, the corrosion rate of Q235 steel decreased from 0.4667 to 0.0873 mm/a with an inhibition efficiency up to 81.3%. Furthermore, by using magnesium sacrificial anode for cathodic protection, the corrosion rate of Q235 steel decreased from 0.2671 to 0.0639 mm/a with an inhibition efficiency up to 76.1%. By using combined protection measure of corrosion inhibitor plus sacrificial anode，the corrosion rate of Q235 steel decreased from 0.3342 to 0.0260 mm/a and inhibition efficiency is up to 92.2%.

Key words: grounding grid corrosion inhibitor cathodic protection

Received: 17 April 2013

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LIN Yonghua,ZHANG Xuefeng,HAN Li,ZHANG Lanhe. Comparison of Corrosion Protection Measures of Grounding Grids for Electric Power Station. Journal of Chinese Society for Corrosion and protection, 2013, 33(6): 501-506.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2013/V33/I6/501

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