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Inorganic protective coatings

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Inorganic protective coatings

Inorganic protective layers - also called conversion layers - are non-metallic, very thin coatings on a metal surface and serve to protect against corrosive attacks.


Inorganic protective coatings are usually produced by the targeted chemical reaction of an aqueous electrolyte solution with the metallic substrate. This is also known as passivation. In addition, spontaneous passivation is also possible - for example in the formation of metal oxides. In the elemental state, aluminium immediately forms aluminium oxide on the surface and thus prevents further oxidation as a dense layer. Anodizing processes can intensify this phenomenon.


Further examples of inorganic protective coatings are phosphating, alkali passivation and chromating.

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Technical terms cannot always be avoided. As corrosion experts, we not only want to give you comprehensive advice, we are also interested in making you a corrosion expert yourself.

The variety around the topic of corrosion and corrosion protection is also in our glossary at home: explanations from A as in Adhesion to T as in Thread tolerance. Have fun clicking through!