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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。
Epoxy resin conductive anticorrosive coating was prepared on the surface of Q235 carbon steel by a physical mixing method. The effect of pigment base ratio (PBR) on the coating performance was studied and the best pigment ratio was determined. The protective behavior of Q235 carbon steel in soil by conductive anti-corrosion coating prepared by the best PBR was tested by electrochemical impedance spectroscopy. The microstructure of the coating was analyzed by SEM and the electrical properties of the coating were tested. The results show that Q235 carbon steel is severely corroded in the soil, E44 epoxy resin varnish coating has a limited protective effect, while conductive anti-corrosion coating Q235 carbon steel in the soil with excellent protective properties. The volume resistivity and surface contact resistance of the coatings were 0.65 Ω · cm and 8.72 Ω / cm ~ 2, respectively. The resistivity changes to 5.95% after the coating has been impacted by 1 kA large current for 20 times, the coating resistivity changes to 11.09% after 5 cycles of 10 A power frequency current, and the coating after impact current and power frequency current Intact, did not find flaking, ablation and cracks and other damage.