中国科学院过程工程研究所机构知识库

钢铁的腐蚀与防护由来已久，意义重大，随着国家对企业VOCs排放控制的升级，用水性涂料代替传统溶剂型涂料防腐势在必行。但石油套管外防护涂料还要求涂层透明、耐冲击、快速固化等，而单独依靠水性树脂无法满足防腐性能要求，本文针对上述问题，主要开展了磷酸锌和聚苯胺颗粒对水性树脂防腐性能影响的研究，主要内容与结果如下： （1）通过液相复分解法制备了磷酸锌（ZP）颗粒，考察了不同反应条件对产物形貌和粒度的影响。当反应温度为60℃、溶液pH=7、锌离子浓度为0.3 M且不添加PEG-10000时，磷酸锌粒径为10 μm，呈薄片状。将由此制备的ZP颗粒分散到水性环氧树脂（ER）中，发现ZP添加量为50.0 wt.%时，涂层的防腐性能最佳。 （2）通过化学氧化聚合法合成了聚苯胺（PANI）颗粒，并探索了不同聚苯胺含量ER涂层的防腐性能。结果表明，PANI颗粒防腐性能较ZP有大幅提升，添加5.0 wt.% PANI的ER涂层阻抗值最高且稳定、阻隔性能最优；添加7.0 wt.%和10.0 wt.% PANI的ER涂层钝化能力更强、涂层缺陷更少，耐盐雾性能更好。 （3）在化学氧化聚合法合成聚苯胺的体系中加入磷酸锌，制备出磷酸锌-聚苯胺复合颗粒（ZP-PANI），并研究了不同磷酸锌-聚苯胺复合颗粒含量对涂层的防腐性能的影响。结果表明，涂层阻抗随着ZP-PANI添加量的增高而升高，当ZP-PANI的添加量增加到7.0 wt.%时，涂层的阻隔性能和稳定性显著提高；添加30.7 wt.% ZP-PANI的ER涂层阻隔性、稳定性和钝化能力最强，阻抗值达到1010 Ω·cm2数量级，远高于仅添加磷酸锌或聚苯胺的涂层体系的阻抗值。但机械性能与盐雾试验结果表明，过高的复合颗粒含量会使涂层的柔韧性下降、附着力变差而容易鼓泡甚至脱落，耐盐雾性能降低;Corrosion and protection of steel have a long history, and it is of great significance. With the upgrading of state-to-business VOCs emission control, it is imperative that water-based coatings replace traditional solvent-based coatings for corrosion protection. However,the oil casing protective coating also requires the coating to be transparent, impact-resistant, fast-curing, etc., and the water-based resin alone can not meet the requirements of anti-corrosion performance. This paper focuses on the above issues, mainly carried out the study of impact of the zinc phosphate and polyaniline particles on the anti-corrosion performance of the water-based resin, the main content and results are as follows: (1) Zinc phosphate(ZP) particles were prepared by liquid-phase metathesis. The effects of different reaction conditions on the morphology and particle size of the product were investigated. When the reaction temperature was 60℃, the solution pH was 7, the zinc ion concentration was 0.3 M, and PEG-10000 was not added, the zinc phosphate particle size was 10 μm and it was in the form of flakes. The ZP particles thus prepared were dispersed in an aqueous epoxy resin(ER), and when the amount of ZP added was 50.0 wt.%, the corrosion resistance of the coating was the best. (2) Polyaniline(PANI) particles were synthesized by chemical oxidation polymerization and the corrosion resistance of different polyaniline ER coatings was explored. The results showed that the anti-corrosion performance of PANI particles was significantly higher than that of ZP. The ER coating with 5.0 wt.% PANI added had the highest resistance and stability, and the best barrier properties, fewer coating defects, and better salt spray resistance. (3) The zinc phosphate-polyaniline composite(ZP-PANI) particles were prepared by adding zinc phosphate in the system of chemical oxidative polymerization to synthesize polyaniline, and the influence of different content of composite particles on the corrosion resistance of the coating was studied. The results show that the coating impedance increases with the addition of ZP-PANI. When the amount of ZP-PANI is increased to 7.0 wt.%, the barrier properties and stability of the coating increase significantly. The ER coating with 30.7 wt.% ZP-PANI added has the highest barrier, stability, and passivation capabilities, with resistance values on the order of 1010 Ω·cm2, which is much higher than the impedance value of ER coatings adding zinc phosphate or polyaniline only. However, the mechanical properties and salt spray test results show that the ER coating with excessively high composite particle content has poor flexibility and adhesion, becomes more easy to blister or even fall off, and has poor resistance to salt spray