Synthesis And Application Of Two No-Toxicity Anticorrosive Pigments

In this paper, two kinds of green anti-corrosion pigments were synthesized by solventhermal and other methods, and characterized by FT-IR, NMR, X-ray diffraction, et al. They were used in the waterborne coatings and the best ratio was obtained according to the results of their anticorrosive functions. Also, the preservation of the two pigments was further discussed in theory.This paper consists of three parts. In the first part, the research progress, the importance of the theoretical study and practical application, the advantages and disadvantages as well as the developing direction of the anti-corrosion pigments were reviewed.In the second part, zinc & calcium phosphomolybdate, a new type of anticorrosive pigment was synthesized and its composition and structure were characterized through FT-IR, NMR and XPS. The zinc & calcium phosphomolybdate were also introduced into epoxy resin coating according to a certain ratio, which was used to coat at the surface of stainless steel as anticorrosive materials. The anticorrosive properties, such as resistance of salty water and salty spray were detected. Their corrosion potentials were also detected by polarization curves. According to the experiment results, the optimizing ratio of the pigment in the waterborne coating and the anticorrosive mechanism of the pigment were discussed.In the third part, the lauric acid imidazoline surfactant was firstly synthesized and characterized by mass spectrometry and FT-IR. Then, the surfactant, phosphoric acid and ammonium molybdate were used as the materials to prepare a new type of super-molecular anticorrosive pigment through hydrothermal synthesis route. The pigment was also characterized by FT-IR, NMR and other analytical methods. The results showed that the super-molecular pigment was the combination of organic and inorganic compounds through the hydrogen bond. The super-molecular pigment and acrylic emulsion were mixed to produce the waterborne coating. The resistance of salty water and spray of the coating were also tested, and the results showed that the anti-corrosive function was greatly improved after the addition of the super-molecular pigment into the coating. The best formula was obtained through the optimization of the experimental conditions.