Corrosion Control by Coatings and Paint

Liquid coatings are used for refrigerators as they are corrosion resistant and are of low cost. In laundry washers and dryers, a primer coating is applied on galvanized steel. 

Porcelain enamel is used mainly in high-level performance appliances. The porcelain enamel coatings are more scratch resistant and heat resistant than the thinner liquid and powder coatings however, porcelain enamel is porous. Holidays are sometimes found in the porcelain (glass). Magnesium, zinc, and aluminum anodes are used in combination with porcelain enamel coatings in water heating systems to act as a sacrificial anode. 

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The three basic corrosion control methods used in corrosion control of home appliances are (i) corrosion control by sacrificial anodes (ii) use of corrosion-resistant materials (iii) corrosion control by coatings and paint. 

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