Repel corrosive environments. This is mainly due to the fact that the coating is impermeable to the corrosive medium and does not react with the corrosive medium. Prevent galvanic corrosion.
That is to use the properties of the base metal and the coating material to know their oxidation-reduction potential, so as to determine whether the coating is a cathode or an anode to the substrate, and what its electrode potential is. Improper matching of coating and substrate materials can cause galvanic corrosion.
Corrosion inhibition. Some protection can be achieved by using chemical corrosion inhibitors as sealants for the spray coating. This method is to fill the porous spray coating with a saturated phase of corrosion inhibitor or with an inorganic sealant. The use of thinner coatings can achieve complete rejection of corrosive environments. In some cases, corrosion-resistant metals can also be used as anti-corrosion coatings, but most of them use oxide ceramics as anti-corrosion coatings.
