Factors affecting the surface oxidation of automobile paint:
The aging index of car topcoat actually reflects the service life of the coating, that is, the ability of the coating to resist the effects of weather when exposed to the natural environment. In daily life, the aging of automotive topcoats is mainly manifested as loss of gloss, fading, discoloration, and peeling and chalking. In nature, light, temperature changes, moisture and chemical corrosion are the main factors leading to the aging of automotive topcoats. The reason is as follows.
(1) Sunlight exposure:
Ultraviolet rays in sunlight are the main factor that causes the aging of polymer materials, and its heat accelerates the aging of the paint surface, thereby causing damage to the paint surface.
(2) Acid-base corrosion:
Rain, dew, and the corrosion of acid and alkaline substances contained in the air can accelerate the aging of the paint surface and make it dull. The acid-base media and organic solvents in nature are the main factors that cause the topcoat to be corroded by chemicals.
(3) Wind and sand wear:
The abrasion of sand and wind can cause many small scratches on the paint surface and weaken the mirror effect of the paint surface.
(4) Iron powder:
Mines, construction sites, urban roads and railways are all the main sources of iron powder. Iron powder itself is easy to oxidize. It also chemically reacts with acids and alkalis to generate rust. When iron powder is oxidized, it will drive the car paint to oxidize. , Lighter ones will reduce the gloss and discoloration of the car paint (white paint will turn yellow, dark paint will turn grayish brown), and severely will cause car paint deterioration, peeling, and peeling.
(5) Urban dirt:
Pollen, insect corpses, bird droppings, asphalt, etc. can cause stains on the paint surface and loss of luster.
(6) Car wax:
Car wax containing petroleum components can protect the paint surface for a very short time, and it will quickly be oxidized, and the oxidized residue will accelerate the aging of the car paint.
(7) Grinding and polishing:
The new factory car paint is sprayed by a machine. The varnish on the surface is particularly smooth. The thickness of the car paint is generally between 90-150um. The thickness of the varnish is 20-30um. Each polishing treatment can reduce 1-3um, which can be seen Repeated polishing will cause serious damage to the paint.
