Development of Functional Organic Coating with Self -Repair Ability for Future Corrosion Resistance Film

用循环伏安法研究了电解因素对锌基电聚合聚2乙烯基吡啶涂层形成的影响。循环伏安法电聚合的聚2-乙烯基吡啶涂层的量与镀液的pH值有很大关系，在pH值为5时，涂层的量最大。这一结果表明，溶液中质子的比量在2-乙烯基吡啶的电聚合过程中起着重要作用。析氢对涂层的形貌有明显的影响。在析氢速率较高的电解条件下，涂层中存在大量因析氢剧烈而形成的凹坑和条纹。在pH值为5的溶液中，20~30℃循环伏安法制备的聚(2-乙烯基吡啶)涂层性能良好。另一方面，计时电流法聚合的电流密度在t…的初始阶段突然降低形成更多的二维涂层，然后随着涂层厚度的增加而减少。在含甲醇的PH5水溶液中，通过在锌片上形成聚2-乙烯基吡啶涂层来降低锌片在3%氯化钠溶液中的阳极和阴极电流密度。在含甲醇的PH5水溶液中，用恒电流技术在30℃的锌基片上电聚合聚2-乙烯基吡啶薄膜。用循环伏安法和恒电位法制备了薄膜，并与恒电流电解法进行了比较。恒电流电解形成的薄膜厚度与库仑量成正比增加，但随着电流密度的增加，析氢增加，薄膜厚度减小。根据红外光谱和薄膜的颜色推测，随着电流密度的增加，聚2-乙烯基吡啶薄膜的结构由非支链结构转变为支链结构。镀膜后锌在3%的氯化钠溶液中的阳极电流密度显著降低。当电聚合电流密度为50A/m2时，对阳极反应的抑制作用最强，表现出优异的耐蚀性。虽然电化学方法对薄膜的厚度和结构没有影响，但恒电流电解法得到的薄膜裂纹最少，耐蚀性最好。较少

The effects of electrolysis factors on the formation of poly(2vinylpyridine) coatings electropolymerized on Zn substrate have been investigated by cyclic voltammetry technique. The amount of poly(2-vinylpyridine) coatings electropolymerized by cyclic voltammetry was significantly dependent on the pH of the bath and the maximum amount of coating was obtained at pH5. This result suggested that the specific amount of proton in the bath should play an important role in the electropolymerization of 2-vinylpyridine. The morphology of the coatings was evidently affected by the hydrogen evolution. Under the electrolysis conditions where the hydrogen evolution rate was increased, the coatings contained many pits and streaks caused by vigorous hydrogen evolution. The poly(2-vinylpyridine) coatings produced by cyclic voltammetry were fine in the bath of pH5 at 20 to 30℃. On the other hand, the current density for polymerization by chronoamperometry was abruptly decreased in the initial stage of t … More wo-dimensional coating formation, then it was subsequently decreased with an increase in the thickness of sound coating. The anode and cathode current density of Zn plate in 3% NaCl solution was decreased by poly(2-vinylpyridine) coating formation on it.The poly(2vinylpyridine) films were electropolymerized on Zn substrate by galvanostatic technique at 30 ℃ in the pH5 aqueous solution containing methanol. The films were also formed by cyclic voltammetry and potentiostatic techniques and were compared with those by galvanostatic electrolysis. The thickness of films formed by galvanostatic electrolysis was increased in proportion to the amount of coulombs but decreased with increasing the current density because of an increase in hydrogen evolution. Based on the FT-IR spectra and the color of films, it was presumed that the structure of poly(2-vinylpyridine) films was changed from non-branched to branched chain type with an increase in current density. The anodic current density for Zn dissolution in 3% NaCl solution were significantly decreased by coating poly(2-vinylpyridine) films. At 50A/m^2 of electropolymerization, the anodic reaction was most inhibited, showing the excellent corrosion resistance. Although the electrochemical techniques had no effect on the thickness and the structure of films, the films formed by galvanostatic electrolysis contained the least cracks to most improve the corrosion resistance. Less