Abstract
Conversion coatings are one of the primary types of galvanic coatings used to protect steel structures against corrosion. They are created through chemical reactions between the metal surface and the environment of the phosphating. This paper investigates the impact that the addition of new metal cations to the phosphating reaction environment has on the quality of the final coating. So far, standard phosphate coatings have contained only one primary element, such as zinc in the case of zinc coatings, or two elements, such as manganese and iron in the case of manganese coatings. The structural properties have been determined using a scanning electron microscope (SEM), X-ray diffraction (XRD), and electrochemical tests. New manganese coatings were produced through a reaction between the modified phosphating bath and the metal (Ba, Zn, Cd, Mo, Cu, Ce, Sr, and Ca). This change was noticeable in the structure of the produced manganese phosphate crystallites. A destructive effect of molybdenum and chromium was demonstrated. Microscopic analysis, XRD analysis and electrochemical tests suggest that the addition of new metal cations to the phosphating bath affects the corrosion resistance of the modified coating.
Highlights
Manganese phosphating is used to protect metal surface against corrosion
The sample prepared in this way was the reference sample for the other coatings produced from modified phosphating baths
The results showed that the layer covering the metal surface had variable morphology, and phosphating the samples were prepared in accordance with the testing procedure the sizes ofBefore produced manganese phosphate crystallites significantly
Summary
Manganese phosphating is used to protect metal surface against corrosion. Metallic surfaces used in the industry are subject to wear and corrosion, which is why they have to be coated with a protective agent. Manganese conversion coatings increase the value and durability of the finished part, improving improving the adhesion between the metal substrate and the paint The sample produced from thelarge bath intercrystalline modified with copper has a different structure. The sample produced from the bath modified with copper has a different structure. The coating produced from the bath modified with the copper compound in accordance of spherical copper crystallites which grew manganese phosphate crystals (Figure 13). The spherical precipitations form an additional outer layer made up produced from the phosphating bath modified with copper nitrate has different properties, starting of crystals containing primarily copper (Figure 13)
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