Development of Solutions for Chemical Phosphating of Carbon Steel
A consumer in Uzbekistan imports concentrates phosphating the surface of carbon steels, such as, for example, Foscon 35 and Foscon 35K. (Russia). Work has been done to create analogs from local raw materials. Having studied the physicochemical properties of the concentrates, a mechanism for the formation of protective phosphate coatings was suggested, and the components of a new phosphating composition were selected. The aim of the work was to develop a composition of a solution for chemical phosphating of the surface of carbon steel at the local resource base. Methods used: elemental chemical analysis, electrochemical and corrosion measurements, conditionally total acidity of solutions was measured according to TU 2149-205-10964029-2004 (Russia). The effect of temperature, pH of the medium, and the exposure time of the sample in the phosphating solution on the quality of the phosphate film was studied. As a result, a phosphating composition FK-1 was developed, functionally similar to imported concentrates Foscon 35 and Foscon 35K, based on local raw materials.