Herein, a waterborne acrylic coating doped with pH sensitive colophony microcapsules containing corrosion inhibitors was studied on carbon steel plates. The changes in the physical properties of the coatings were studied. The microcapsule coating specimens maintained more noble E_corr values compared to the control in deionized water and simulated concrete pore solutions with −513 and −531 mV_SCE, respectively. Additionally, the microcapsule polarization results for both pH 12.6 and 6.2 electrolyte solutions showed lower i_corr values of 1.20 × 10⁻⁶ and 3.24 × 10⁻⁶ A·cm⁻², respectively, compared to the control sample (1.15 × 10⁻⁵ and 4.21 × 10⁻⁵ A·cm⁻²). Therefore, the microcapsule coating provided more protection from chloride attack on the substrate as well as the deleterious effects of low pH on carbon steel. The electrochemical impedance spectroscopy analysis corroborated the DC polarization results, showing increased corrosion resistance for the microcapsule coated specimens compared to the control. Moreover, the R_pore and R_ct are much higher than the control, indicating the protection of the inhibitors. The C_eff,dl also shows lower values for the microcapsule coating than the control, showing a more protective and less doped double layer.

中文翻译：

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通过掺杂微囊缓蚀剂改善丙烯酸水性涂料的腐蚀保护

在此，在碳钢板上研究了一种水性丙烯酸涂料，该涂料掺杂了含有缓蚀剂的 pH 敏感树脂微胶囊。研究了涂层物理性能的变化。与去离子水和模拟混凝土孔隙溶液中的对照相比，微胶囊涂层试样保持了更高的E _corr值，分别为-513 和 -531 mV _SCE。另外，对于pH值两者12.6和6.2电解质溶液的微胶囊偏振结果表明下我_更正件的1.20×10值^-6和3.24×10 ^-6 A·厘米^-2相比，分别与对照样品（1.15×10 ^-5和 4.21 × 10 ^-5 A·cm ^-2 )。因此，微胶囊涂层提供了更多的保护，以防止氯化物对基材的侵蚀以及低 pH 值对碳钢的有害影响。电化学阻抗谱分析证实了 DC 极化结果，表明与对照相比，微胶囊涂层试样的耐腐蚀性能提高。此外，R_孔和R _ct远高于对照，表明抑制剂的保护作用。微胶囊涂层的C _eff,dl也显示出比对照更低的值，显示出更具保护性和更少掺杂的双层。