纳米TiO2提高聚氨酯涂料防腐蚀性能的研究  

Study on improving corrosion resistance of polyurethane coatings by nano TiO2

作　　者：姜志国[1] 宋禹泉 姚明[1] 张续 徐瑞芬[1] 解双英[1] JIANG Zhi-guo;SONG Yu-quan;YAO Ming;ZHANG Xu;XU Rui-fen;XIE Shuang-ying(College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学材料科学与工程学院,北京100029

出　　处：《现代化工》2020年第4期184-187,共4页Modern Chemical Industry

摘　　要：将改性后的纳米TiO2添加到聚氨酯涂料中并涂敷在A3钢电极表面,通过电化学极化曲线研究A3钢在NaCl溶液中的自腐蚀电流密度。结果表明,选用水油平衡(HLB)值为6. 7的脱水山梨醇单棕榈酸酯或HLB为3. 6的乙二醇脂肪酸酯表面活性剂对纳米TiO2表面处理后,其仍具有半导体光致发光性能,并且可以在有机浆料中实现纳米级分散;添加纳米TiO2聚氨酯涂料对A3钢电极具有明显的光电化学防腐蚀保护作用,电极自腐蚀电流密度下降1~2个数量级,最佳质量分数为1%;纳米TiO2在自然光照和暗室条件下均可降低A3钢的自腐蚀电流密度,提高其耐腐蚀性能。Modified nano-TiO2 is added into polyurethane coatings,which is coated onto the surface of A3 steel electrode. Self-corrosion current density of the coated A3 steel electrode in Na Cl solution is studied through electrochemical polarization curve. The experimental results show if nano-TiO2 is treated by dehydrated sorbitan monopalmitate with a water-oil equilibrium( HLB) value of 6. 7 or ethylene glycol ester surfactant with an HLB value of 3. 6,it still remains semiconductor photoluminescence properties and can achieve nano-scale dispersion in organic slurry.Polyurethane coatings with modified nano-TiO2 has obvious photoelectrochemical corrosion protection effect on A3 steel electrode,making electrode’s self-corrosion current density decrease by 1-2 orders of magnitude.The best mass fraction of modified nano-TiO2 is 1%.Modified nano-TiO2 can reduce the self-corrosion current density of A3 steel and improve its corrosion resistance under natural light or in darkroom conditions.

关 键 词：纳米TIO2 聚氨酯涂料 A3钢 电极化曲线 自腐蚀电流密度 防腐蚀性能 

分 类 号：TQ632[化学工程—精细化工]