以环氧氯丙烷和酚醛树脂为主要成分合成了一种酚醛改性环氧树脂,对酚醛改性环氧树脂进行了傅里叶变换红外分析与热分析。使用该树脂与聚醚多元醇等通过相反转法制备了一种水性环氧乳液,利用该乳液制备了一种水性无铬环氧防腐涂料,并对涂料的耐中性耐盐雾性能进行了测试。采用电化学测试对涂层腐蚀过程与结果进行了研究与探讨。结果表明:制备的水性环氧涂料初始状态的腐蚀电位在-1.1V左右,电阻值在108Ω·cm2以上,其耐腐蚀性能十分优异;在2500h耐盐雾测试后,其腐蚀电位变化较小,电阻值在106Ω·cm2以上,仍具有较好的耐腐蚀性能;在5000h耐盐雾测试后,涂层的腐蚀电位为-1.3V左右,电阻值下降至105～106Ω·cm2,其屏蔽作用下降明显,但涂层表面状态基本无变化。
A phenolic-modified epoxy resin was synthesized with epoxy chloropropane and phenolic resin as the main constituents.Fourier transform infrared analysis and thermal analysis were carried out on the phenolic-modified epoxy resin.A waterborne epoxy emulsion was prepared by using this resin and polyether polyols through the phase inversion method.A waterborne chromium-free epoxy anticorrosive coating was fabricated with the emulsion,and the neutral salt spray resistance performance of the coating was tested.The corrosion process and results of the coating were investigated and discussed by electrochemical testing.The results indicated that the initial corrosion potential of the prepared waterborne epoxy coating was approximately -1.1V,and the resistance value was above 108Ω·cm2,demonstrating extremely excellent corrosion resistance performance.After 2500h of salt spray testing,the change in corrosion potential was minor,and the resistance value was above 106Ω·cm2,still maintaining relatively good corrosion resistance performance.After 5000h of salt spray testing,the corrosion potential of the coating was around -1.3V,and the resistance value decreased to 105～106Ω·cm2,indicating a significant reduction in shielding ability,but the surface state of the coating remained essentially unchanged.
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