目前，有关不同的酸对硅烷水解及成膜性能的影响少有研究报道。借助电导率测定，研究了一元酸盐酸、醋酸及多元酸草酸、磷酸等对KH560、KH792单一硅烷及二者复合后硅烷水解、聚合过程的影响，以Q235低碳钢片和载玻片为基体，将其浸渍在不同酸调配的硅烷溶液中制备了有机硅烷膜，并通过铅笔硬度、塔菲尔极化曲线测定，评价了有机硅烷膜层的耐蚀性与硬度。结果表明：醋酸、盐酸对硅烷KH792的水解具有促进作用，对水解后硅醇的聚合起到延缓作用，提高了KH792溶胶的稳定性。草酸、磷酸等多元酸由于过多的交联点及酯化、酰胺化与自身缩合反应同时进行，导致KH792溶胶快速胶凝为高分子。KH560与KH792在醋酸、盐酸催化下水解、共聚，缩短了涂层常温固化时间，提高了交联密度，增强膜层的致密性，涂层耐蚀性、铅笔硬度显著提高。表干时间由96 h减小至4 h，形成的复合膜层硬度可达到3 H，在3.5%NaCl溶液的自腐蚀电流密度由2.364 8×10-5 A/cm2下降至4.967 0×10-6A/cm2。
At present, the effect of various acids on the hydrolysis and film-formation properties of silane has been less studied.In this paper, the influence of hydrochloric acid and acetic acid on the hydrolysis and polymerization process of KH560 and KH792 single silane and silane after their combination was studied by conductivity measurement.Moreover, the organic silane film was prepared by impregnating Q235 low carbon steel sheet and glass slide in the silane solution mixed with different acids.The resistance of corrosiveness and hardness for the organic silane film were evaluated by pencil hardness and Tafel polarization curve test.Results showed that acetic acid and hydrochloric acid could promote the hydrolysis of silane KH792, delay the polymerization of silanol after hydrolysis, and improve the stability of KH792 collosol.Due to too many cross-linking points, esterification, amidation and self-condensation of polyacids coincided such as oxalic acid and phosphoric acid, KH792 collosol was rapidly gelled into polymer.In addition, hydrolysis and copolymerization of KH560 and KH792 under the catalysis of acetic acid and hydrochloric acid could shorten the curing time of the coating at room temperature, improve the crosslinking density, enhance the density of the coating and significantly improve the corrosion resistance and pencil hardness of the coating.The surface dry time decreased from 96 h to 4 h, and the hardness of the composite film reached 3H.Besides, the self-corrosion current density of films in 3.5% NaCl solution decreased from 2.364 8×10-5A/cm2 to 4.967 0×10-6A/cm2.
