储罐防腐涂料在不同含水率甲醇中的性能研究

Performance study of storage tank anticorrosive coatings in methanol with different moisture content

关键词:  无机硅酸锌  精甲醇  粗甲醇  环氧酚醛 

Key words:  inorganic zinc silicate  refined methanol  crude methanol  epoxy phenolic

摘要:

目的 针对含水率较高的粗甲醇对储罐造成的腐蚀问题,开展甲醇储罐用防腐涂料研究。方法 选用环氧酚醛和无机硅酸锌涂料样板,分别在纯甲醇和水质量分数为37.5%的甲醇两种溶液中进行浸泡实验,对浸泡前后的外观形貌、膜厚度、质量、红外光谱等进行了对比分析,并采用光学显微镜对涂料浸泡前后的微观形态进行了测试。结果 环氧酚醛涂料在两种溶液中的防腐性能显著变化,在水质量分数为37.5%的甲醇溶液中,环氧醚键遭到破坏,出现了羟基功能团,漆膜性能下降,漆膜产生破坏；无机硅酸锌涂料在两种溶液中的性能变化不大。结论 在含水甲醇溶液中,无机硅酸锌涂料的耐腐蚀性更强。 

Abstract:

Objective Aiming at the corrosion problem caused by crude methanol with high moisture content in the storage tank, the anticorrosive coating for methanol storage tank was studied. Methods The epoxy-phenol resin paint coating samples and inorganic zinc silicate coating samples were soaked in pure methanol and methanol solution with water content of 37.5%, and the appearance, film thickness, weight and infrared spectrum before and after soaking were compared and analyzed, including the microscopic morphology of the coating before and after soaking was tested by optical microscope. Results The anti-corrosion performance of the epoxy-phenol resin paint significantly changes in both solutions. In a methanol solution with a moisture content of 37.5%, the epoxy ether bond is destroyed, hydroxyl functional groups appear, and the performance of the paint film decreases, resulting in damage to the paint film. The performance of inorganic zinc silicate coatings shows little change in both solutions. Conclusion In aqueous methanol, inorganic zinc silicate coatings have stronger corrosion resistance.