Abstract
The article presents a method for obtaining white phosphate coatings on steel by cold method. The deposition of protective phosphate coatings was carried out from solutions based on the preparation “Majef”, consisting of manganese and iron phosphates. To obtain phosphate films of white color, it is proposed to introduce zinc and calcium nitrates into phosphating solutions at the rate of 25–30 g/L. The surface of phosphate coatings was studied using the SolverP47-PRO atomic force microscope images, and the average grain size was determined. The structural and phase composition of phosphate coatings was been studied using X-ray diffraction analysis. The protective properties of phosphate coatings were estimated by corrosion rate indicators calculated from corrosion diagrams. Fine-crystalline uniform coatings were obtained from modified phosphating solutions at room temperature on steel. The white color of phosphate coatings is due to the increased content of phosphophyllite, hopeite, and parascholzite in their structural and phase composition. By applying protective phosphate coatings of white color on a steel product, corrosion can be slowed down by 4–4.5 times. However, white phosphate coatings are inferior in protective properties to unpainted coatings. The index of change in the mass of samples with white phosphate coatings because of corrosion is 0.371–0.41 g/(m2·h), and with unpainted coatings is 0.128 g/(m2·h).
Highlights
The most used method of corrosion protection involves mass alloying or surface modification
The main advantage of the phosphate film is that it has high corrosion resistance in all types of combustible, lubricating and organic oils, in benzene, toluene and in all gases except hydrogen sulfide [8,9]
On the surface of the white phosphate coating, defective areas are formed from a solution with the addition of calcium nitrate
Summary
The most used method of corrosion protection involves mass alloying or surface modification. Phosphating has long been successfully used as a method of protecting metal products and structures from corrosion [5,6,7]. The main advantage of the phosphate film is that it has high corrosion resistance in all types of combustible, lubricating and organic oils, in benzene, toluene and in all gases except hydrogen sulfide [8,9]. Phosphate coatings are used to protect against corrosion in combination with paint and polymer films, oils, and waxes, facilitate cold deformation of metal, reduce the coefficient of friction, create an insulating layer in electrical engineering, etc., [5,6,7,8,9,10,11,12]
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