变电站接地网的焊缝腐蚀分析

冯拉俊; 邓博; 闫爱军; 张静

变电站接地网的焊缝腐蚀分析

1.
西安理工大学陕西省腐蚀与防护重点实验室, 西安 710048
2.
陕西电力科学研究院, 西安 710054

基金项目: 国家电网公司科技资助项目(5226KY11003300);陕西省教育厅重点实验室资助项目(13JS077)

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出版历程
- 收稿日期: 2013-03-19

Corrosion behavior of weld joints of substation grounding grid

1.
Material Corrosion and Protection Key Laboratory of Xi'an, Xi'an University of Technology, Xi'an 710048, China
2.
Shaanxi Electric Power Research Institute, Xi'an 710054, China

摘要

摘要: 为了给接地网焊缝的腐蚀防护提供基础,通过电化学噪声和埋片模拟方法,研究了接地网焊缝与母材腐蚀的差别.结果发现在陕西省孝义变电站土壤中,Q235钢接地网焊缝出现了较多暂态峰,母材的暂态峰较少,焊缝腐蚀对接地网泄流的电压更敏感;腐蚀过程中母材噪声阻值R_n=3.38×10⁴Ω/cm²,焊缝噪声阻值R_n=1.44×10⁴Ω/cm²;母材的腐蚀速率为0.067 mm/a,含有焊缝的焊接接头腐蚀速率为0.077 mm/a,母材为均匀腐蚀,焊缝主要为局部腐蚀.
- 接地网 /
- 焊缝腐蚀 /
- 电化学噪声 /
- 局部腐蚀
Abstract: To provide foundation for corrosion protection of the weld metal using in grounding grid, the corrosion difference between the weld and base metal of grounding grid was studied by electrochemical noise and field coupon method. The results showd that there were many transients in the time series of the weld of Q235 steel for grounding grid in soil of Shaanxi Xiaoyi substation, while a few transients in the time series of the Q235 base metal, which indicated that weld corrosion was more sensitive to discharge voltage of grounding grid. The noise resistance of the weld metal, Rn, was 3.38×10⁴Ω/cm² during the corrosion process, and the Rn of the weld was 1.44×10⁴Ω/cm². The corrosion rate of the weld metal was 0.067 mm/a, and for the welded joint was 0.077 mm/a. The based metal was in a uniform type of corrosion and the weld was mainly in a pitting type of corrosion.
- grounding grid /
- weld corrosion /
- electrochemical noise /
- localized corrosion