Basic Concepts Of Protective Coatings

Protective coatings consist of layers of protective material applied most commonly to steel or concrete, most commonly used to safeguard components against corrosion. Corrosion is a major problem, one that is present in all types industry, from construction to automotive industry, and protective coatings are put in place to help prevent material degradation, in order to increase efficiency and prolong life. Other coatings can also provide different types of protection, such as intumescent coating, used for fire protection.

There are several types of substances commonly used for protective coatings: epoxy, polyurethane, fluoropolymer, phenolic coatings, molybdenum disulfide, etc. There a number of other coatings used as well, each with its own unique properties and advantages.

Fluoropolymer protective coatings are blends of high performance resins and lubricants. These single coat thin films provide excellent corrosion and chemical resistance. Other benefits of fluoropolymer protective coatings include reduced friction, non stick, non wetting, electrical resistance and abrasion resistance.

Polyurethane protective coatings provide a thin film, glossy finish and are used in virtually all industries to provide a smooth but durable finish that has excellent resistance to corrosion, abrasion, and exposure to chemicals.

Molybdenum disulfide protection is commonly used in applications where carrying capacity, operating temperature and friction coefficient are of primary concern. This coating provides effective lubrication in a wide range of loads, even those as high as 250,000 psi.

Phenolic protective coatings offer consistent high quality protection for a wide range of applications, which include immersion service for most acids, solvents, and salts. This coating is most typically used where low pH environments and higher temperatures are factors. Phenolic protective coatings display excellent resistance to 92% - 98% sulfuric acid at temperatures up to 120F. Phenolic chemical protection is also resistant to hydrochloric acid, phenol, anhydrous chlorobenzene, carbon tetrachloride, and many other chemicals. It should also be noted that this type of coating has a maximum recommended use temperature of 500°F.

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