The protection of mild steel by modified epoxy coating containing colophony microencapsulated corrosion inhibitors was investigated in this study. The corrosion behavior of these epoxy coatings containing colophony microcapsules was studied by electrochemical analysis using cyclic potentiodynamic polarization and electrochemical impedance spectroscopy. The microcapsule coating showed decreased corrosion current densities of 2.75 × 10⁻⁸ and 3.21 × 10⁻⁸ A/cm² along with corrosion potential values of 0.349 and 0.392 V_SCE for simulated concrete pore solution and deionized water with 3.5 wt.% NaCl, respectively, indicating improved corrosion protection in both alkaline and neutral pH. Electrochemical impedance spectroscopy analysis also showed charge transfer resistance values over one order of magnitude higher than the control sample, corroborating the electrochemical corrosion potential and current density testing results. Overall, the use of colophony microcapsules showed improved corrosion protection in simulated concrete pore solution and DI water solutions containing chloride ions.

中文翻译：

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智能环保微胶囊的环氧涂层保护碳钢钢筋

在这项研究中，研究了通过改性环氧树脂涂层对低碳钢的保护，该涂层包含树脂微囊化腐蚀抑制剂。通过使用循环电位动力学极化和电化学阻抗谱的电化学分析，研究了这些含有树脂微囊的环氧涂料的腐蚀行为。微胶囊涂层的腐蚀电流密度降低了2.75×10 ^-8和3.21×10 ^-8 A / cm ²，腐蚀电位分别为0.349和0.392 V _SCE分别用于模拟混凝土孔隙溶液和含3.5 wt％NaCl的去离子水，表明在碱性和中性pH值下均具有更好的腐蚀防护性能。电化学阻抗谱分析还显示，电荷转移电阻值比对照样品高一个数量级，从而证实了电化学腐蚀电位和电流密度测试结果。总的来说，在模拟的混凝土孔隙溶液和含氯离子的去离子水溶液中，使用树脂微胶囊显示出更好的防腐蚀性能。