Coating Terms

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Surfaces cleaned from oil and dirt are pretreated before paint application. Since use of Cr+6 is restricted, it’s been superseded by phosphate coatings. Among phosphate coatings, the best corrosion resistance and surface adhesion are achieved by tricationic phosphate coatings (zinc-nickel-manganese phosphate). Phosphate coatings can be applied by dipping or spraying. Shape of the formed metal phosphate crystals depends on the application method. In dipping, crystals cover the metal surface as a protective shield made of ordered fish scales. In spray applications, acicular (perpendicular to metal surface) metal phosphate crystals are formed. Therefore, by dipping method, impervious and high corrosion resistant phosphate coatings with high stone chip resistance are formed.