Characterization of Zinc and Manganese Phosphate Layers Deposited on the Carbon Steel Surface

Abstract

The phosphating process is usually used to improve metals corrosion resistance properties. In this article, the carbon steel surface was coated with a phosphate layer based on zinc or manganese. Three types of phosphating solutions with different substances and concentrations were used for this process. The deposited layers were structurally characterized by Fourier-transform infrared spectroscopy (FTIR) in order to highlight the main compounds specific to the phosphate layers. In the same time, by means of this analysis it is possible to confirm and evaluate the formation of coating layer and its degree of hydration.