A Reviw of Zinc Rich Coating: Basic, Mechanism, Quality Control and Modification

The protective mechanisms of zinc-rich coatings include cathodic protection driven by the more active Zn particles and barrier-type protections due to the formation of zinc oxide and sealling the pores between the zinc particles are discussed. Methods of evaluating the performance of these coatings are also discussed and electrochemical evaluation as one of the most important method that can provide quantitative results has been more studied. At the end, two ideas of research performed to improve the electrical conductivity of the coatings to increase the longevity of cathodic protection and improved barrier property to prevent penetration of corrosive agents and slow down intake of zinc metal powder is provided.