Abstract Water-borne rust-resistant coatings were prepared by using aluminum triphosphate as the rust conversion agent and a styrene acrylic emulsion, and the mechanism of rust prevention was studied by electrochemical impedance spectroscopy. With increasing soaking time, aluminum triphosphate is further decomposed into orthophosphate to improve the corrosion resistance of the matrix. Within six hours, with increasing immersion time, the impedance value of the conversion film increased, and the maximum impedance of the conversion coating was 954.4 Ω cm2, indicating that the speed of rust transformation to form a protective film was slow and that the corrosion resistance of the conversion film was low. Hydroxyethylidene-1,1-diphosphonic acid (HEDP) and tannic acid were added to modify aluminum triphosphate, and all of them had a chelating effect. Through synergistic effects, the impedance of the modified conversion film reaches 32,495 Ω cm2, which improves the rust conversion and antirust performance and obviously improves the shortcomings of the early antirust performance of aluminum triphosphate used alone. The results of infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy show that the modification with the organic acids involves adsorption on the aluminum triphosphate particles through physical and chemical adsorption. Electrostatic repulsion can prevent the tripolyphosphate ions from agglomerating, making them uniformly dispersed and improving the bonding of the coating film. The modified formulation has better corrosion resistance and rust transformation ability than that of aluminum triphosphate alone.

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有机酸改性三磷酸铝作为防锈剂的防腐机理

摘要 以三磷酸铝为锈转化剂，采用苯乙烯丙烯酸乳液制备水性防锈涂料，并采用电化学阻抗谱研究其防锈机理。随着浸泡时间的增加，三磷酸铝进一步分解为正磷酸盐，以提高基体的耐腐蚀性能。6 h内，随着浸泡时间的增加，转化膜的阻抗值增大，转化膜的最大阻抗为954.4 Ω cm2，说明锈蚀形成保护膜的速度较慢，耐腐蚀性能好。转化膜的低。加入羟亚乙基-1,1-二膦酸（HEDP）和鞣酸对三磷酸铝进行改性，均具有螯合作用。通过协同作用，改性转化膜阻抗达到32495Ω·cm2，提高了防锈转化和防锈性能，明显改善了单独使用三磷酸铝早期防锈性能的缺点。红外光谱、X射线衍射、X射线光电子能谱和扫描电镜结果表明，有机酸改性涉及通过物理和化学吸附作用在三磷酸铝颗粒上的吸附。静电斥力可以防止三聚磷酸根离子团聚，使其分散均匀，提高涂膜的结合力。改性后的配方比单独使用三磷酸铝具有更好的耐腐蚀性能和锈蚀转化能力。改性转化膜阻抗达到32495Ω·cm2，提高了防锈转化和防锈性能，明显改善了早期单独使用三磷酸铝防锈性能的缺点。红外光谱、X射线衍射、X射线光电子能谱和扫描电镜结果表明，有机酸改性涉及通过物理和化学吸附作用在三磷酸铝颗粒上的吸附。静电斥力可以防止三聚磷酸根离子团聚，使其分散均匀，提高涂膜的结合力。改性后的配方比单独使用三磷酸铝具有更好的耐腐蚀性能和锈蚀转化能力。改性转化膜阻抗达到32495Ω·cm2，提高了防锈转化和防锈性能，明显改善了早期单独使用三磷酸铝防锈性能的缺点。红外光谱、X射线衍射、X射线光电子能谱和扫描电镜结果表明，有机酸改性涉及通过物理和化学吸附作用在三磷酸铝颗粒上的吸附。静电斥力可以防止三聚磷酸根离子团聚，使其分散均匀，提高涂膜的结合力。改性后的配方比单独使用三磷酸铝具有更好的耐腐蚀性能和锈蚀转化能力。