采用水性纳米ZrO2溶胶与γ-缩水甘油醚氧丙基三甲氧基硅烷(GPTMS)为原料,通过溶胶-凝胶方法,制备了水性有机无机杂化防腐涂层.实验研究了ZrO2/GPTMS摩尔比对涂层耐盐雾性能及电化学性能的影响.实验结果表明,涂层的耐腐蚀性能随着摩尔比的增加呈现先增强后下降的趋势,其中1∶5涂层的耐腐蚀性能最强,耐盐雾时间达到1 500 h,是未涂覆涂层样板耐盐雾时间的20倍左右,电化学交流阻抗为107 Ω·cm2,腐蚀电流密度为5.84×10-10A/cm2.从1∶5涂层的SEM照片发现,涂层中纳米ZrO2粒子分散均匀,无团聚现象.另外,TG分析表明,涂层的热稳定性能随着摩尔比的增大而增加.
Water-borne organic-inorganic hybrid coatings were obtained via sol-gel condensation between GPTMS and zirconia particles dispersed in water.The impacts of molar ratios of ZrO2 to GPTMS on salt spray resistance and electrochemical performance were investigated.Results indicated that with increasing ratio of ZrO2/GPTMS, the anticorrosion property of the coatings firstly increased and then decreased.The optimal ratio of ZrO2/GPTMS was 1∶5, and the salt spray process time of coatings with optimal ratio was 1 500 h, impedance was 107 Ω·cm2 and the corrosion current density was 10-10 A/cm2.SEM image exhibited that the coating with ZrO2/GPTMS ratio of 1∶5 had a good dispersible uniformity without agglomeration.TG test showed that the thermal stability of the hybrids increased firstly and then decreased with the increasing ratio of ZrO2/GPTMS.
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