Ivanova D.2024-07-162024-07-162024-07-162024-07-162019-01-011314-79781314-7471SCOPUS_ID:85069793740https://rlib.uctm.edu/handle/123456789/1251In this investigation three type phosphating concentrates containing zinc, manganese and nickel phosphates in different ratios have been studied. Gravimetric, chemical, electrochemical and physical methods were used to determine the main characteristics of the concentrates and obtained phosphate coatings. The results indicate that the coatings formed in KAF-622 are thicker, while those obtained in other concentrates are practically all the same. The phosphate coatings contain mainly hopeite and less phosphophyllite. Irrespective of modification the correlation of metal phosphates in the concentrates the coatings obtained have homogeneous structures with well defined habits of the crystals. All coatings formed in phosphate concentrates possess a good resistance in a model 3.5 % NaCl corrosion solution.enArticle