接地网用导电防腐蚀涂层研究

发布时间：2018-04-12 08:12

本文选题：接地网 + 碳钢　；参考：《中国腐蚀与防护学报》2015年06期

【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0.65Ω·cm和8.72Ω/cm~2。涂层经1 k A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。
[Abstract]:Epoxy resin based conductive anticorrosive coating was prepared on Q235 carbon steel surface of grounding grid by physical mixing method. The effect of PBR on the properties of the coating was studied and the optimum ratio was determined.The protective behavior of the conductive anticorrosive coating prepared with the best PBR on Q235 carbon steel in soil was measured by electrochemical impedance technique. The microstructure of the coating was analyzed by SEM technique, and the electrical properties of the coating were tested.The results showed that the protective effect of E44 epoxy resin varnish coating on Q235 carbon steel was limited, while the conductive corrosion resistant coating had excellent protection performance in soil.The volume resistivity and surface contact resistance of the coating are 0.65 惟 cm and 8.72 惟 / cm ~ (-2), respectively.The resistivity of the coating changed to 5.95 after 20 times impact of 1 Ka high current, and 11.09 after 5 times of 10 A power frequency current. After the impact current and power frequency current, the coating was intact and no damage such as exfoliation, ablation and crack was found.
【作者单位】：广东电网有限责任公司电力科学研究院;中国科学院金属研究所;广东电网有限责任公司东莞供电局;
【分类号】：TG174.4

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