Preparation and Performance Evaluation of a Green Rust Conversion Coating

A rust transforming agent (Rust CA) was prepared by esterification of 2,3-butanediol and gallic acid. A green rust transforming coating, having good rust construction performance and corrosion resistance was prepared by adding film forming agent, curing agent, diluent and defoamer. IR spectroscopy, X-ray diffraction and scanning electron microscopy were used to analyze the structure, component and morphology of the rust transforming agent and rust transforming coating. Adhesion, impact resistance, electrochemical performance and salt spray corrosion resistance of the coating were tested. The applicability of coatings under simulated conditions was evaluated in natural environment of southern China, water immersion environment and UV environment. The results show that the adhesion reached level Ⅰ, impact strength reached 5.79 J. There was no blistering, wrinkling or falling after 720 h salt spray corrosion test. The coating had the best adaptability in natural environment of southern China compared with other two experimental conditions.