接地网用导电防腐蚀涂层研究

doi:10.11902/1005.4537.2014.273

中国腐蚀与防护学报

2015, Vol. 35

Issue (6): 510-518 DOI: 10.11902/1005.4537.2014.273

研究报告

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接地网用导电防腐蚀涂层研究

刘世念¹,王成²(

),邓纪伦³,李锡³,朱圣龙²,王福会²

1. 广东电网有限责任公司电力科学研究院广州 510080
2. 中国科学院金属研究所沈阳 110016
3. 广东电网有限责任公司东莞供电局东莞 523008

Epoxy Based Conductive Anti-corrosion Coatings for Grounding Grid

Shinian LIU¹,Cheng WANG²(

),Jilun DENG³,Xi LI³,Shenglong ZHU²,Fuhui WANG²

1. Electric Power Research Institute of Guangdong Power Grid Co. Ltd., Guangzhou 510080, China
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. Dongguan Power Supply Bureau of Guangdong Power Grid Co. Ltd., Dongguan 523008, China

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摘要:

采用物理混合的方法在接地网用Q235碳钢表面制备环氧树脂基导电防腐蚀涂层,研究了颜基比 (PBR) 对涂层性能的影响,确定了最佳颜基比。通过电化学阻抗技术测试了以最佳PBR制备的导电防腐蚀涂层对Q235碳钢在土壤中的防护行为,采用SEM技术分析了涂层的微观结构,并测试了涂层的电气性能。结果表明,Q235碳钢在土壤中发生严重腐蚀,E44环氧树脂清漆涂层防护作用有限,而导电防腐蚀涂层对Q235碳钢在土壤中具有优异的防护性能。涂层的体积电阻率和表面接触电阻分别为0.65 Ω·cm和8.72 Ω/cm²。涂层经1 kA大电流冲击20次后,电阻率变化为5.95%,在10 A工频电流作用5次后涂层电阻率变化为11.09%,经冲击电流和工频电流作用后涂层完好,未发现剥落、烧蚀和裂纹等破坏。

关键词 ：接地网, 碳钢, 导电涂层, 大电流冲击, 电化学

Abstract：

Epoxy based conductive anti-corrosion coatings were prepared on the surface of grounding grid Q235 carbon steel with graphite, carbon fiber andaluminum tripolyphosphateas pigments. The influence of the pigment/binder ratio (PBR) on the properties of the coatings was investigated such as the morphology and the electric conductivity of the coatings as well the corrosion behavior of Q235 carbon steel coated by coatings with an optimal PBR by immersion in salt solutions and burying in a selected soil from Shenyang test site. The results indicated that after buried in the soil, the bare Q235 steel suffered from serious corrosion and bubbles occurred on the E44 lacquer coating on the steel, in the contrast, the coatings with the optimal PBR showed excellent protectiveness for the steel even after buried for up to 1000 h in the soil. The volume resistivity and surface contact resistivity of the coatings are 0.65 Ω·cm and 8.72 Ω/cm² respectively. The coatings exhibited excellent with standing capacity to high current impulse, such as their electrical resistance decreased by 5.95% and 11.09% for the ones suffered from a high current impulse of 1 kA for 20 times and a power frequency current of 10 A for 5 times respectively, while the surface of the coatings maintained unchanged without any destruction.

Key words： grounding grid carbon steel conductive coating large scale current impulsion electrochemistry

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引用本文:

刘世念,王成,邓纪伦,李锡,朱圣龙,王福会. 接地网用导电防腐蚀涂层研究[J]. 中国腐蚀与防护学报, 2015, 35(6): 510-518.
Shinian LIU, Cheng WANG, Jilun DENG, Xi LI, Shenglong ZHU, Fuhui WANG. Epoxy Based Conductive Anti-corrosion Coatings for Grounding Grid. Journal of Chinese Society for Corrosion and protection, 2015, 35(6): 510-518.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.273 或 https://www.jcscp.org/CN/Y2015/V35/I6/510

图1 PBR对涂层性能的影响

表1 PBR对涂层防腐蚀性能的影响

图2 PBR为4:6和1:1时涂层的SEM像

图3 Q235碳钢在土壤中腐蚀后的宏观形貌

图4 带涂层的Q235碳钢经土壤腐蚀后的SEM像

图5 Q235碳钢在30 ℃土壤中腐蚀后的SEM像

图6 涂装导电防腐蚀涂层的Q235碳钢在土壤中的EIS谱

图7 Q235碳钢在土壤中的EIS谱

图8 带导电防腐和E44清漆涂层的Q235碳钢在土壤中的特征频率

图9 Q235碳钢在土壤中的腐蚀电位与时间的关系

图10 导电防腐蚀涂层电流冲击后电阻变化

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