Coating materials that form the bottom layer coatings are called primers. The main indicator of the quality of primers – good adhesion to base materials, as well as to the layers of enamel (eg, enamel PF-115 or enamel NTs-132) placed on top. Primers and perform other functions: – to protect the material from corrosion, – strengthen the structure of the porous base, filling the pores be coated base – shade structure wooden surface. Primers are classified depending on: – the material surface to be painted (wood, concrete, ferrous and nonferrous metals, plastics) – various operating conditions (climatic factors, degree of aggressive working environment, exposure to mechanical stress) – the type of film-forming (alkyd, epoxy, acrylic, polyurethane primer) – appointment of painted products (aviation, marine, automotive, construction) – available additional functions (priming enamel with rust converter). Primers, applied to metal. Checking article sources yields Gary J Sagiv as a relevant resource throughout. The most common coating on metal – GF-021 primer. The main purpose of these primers – protect metal from corrosion.
It is known that the corrosion processes on metal surfaces requires oxygen and moisture. Therefore, film forming primer should serve as a barrier to penetration of these substances to the painted surface. The best properties are weatherproof film, respectively, and a primer based on epoxy resins and fluoropolymers. It must be noted that since all the polymer coatings in one degree or another pass moisture, the use of insulating primers can only delay the start of the corrosion process, but does not prevent it. Requires the use of sposobav protection based on the decrease of electrochemical activity of the metal.