The failure of the anti-corrosion coating, the coating is affected by various factors during use, which causes irreversible changes in the physical, chemical and mechanical properties of the coating, and eventually leads to the destruction of the coating. This phenomenon is generally called coating film failure or aging.
The macroscopic manifestations of coating failure are blistering, softening, cracking, shedding, deformation, and pulverization. The aging of the coating can be divided into physical failure and chemical failure. Physical aging refers to the phenomenon of coating swelling, medium infiltration, coating, cracking and other performance degradation phenomena under the action of environmental media and stress during the service process of the coating.
Chemical failure refers to physical and chemical properties such as medium infiltration, coating, cracking, powdering, etc. deterioration phenomenon.
In the natural atmospheric environment, the relative molecular weight of the coating film decreases, or the gloss of the coating film decreases and becomes brittle, cracking is even pulverization, which mainly reflects wear resistance, weather resistance of the coating film, cracking of the anti-corrosion coating, Phenomena such as shedding and powder painting are destructive, extreme phenomena and protective functions have long been lost. Blistering of the coating is the first appearance of damage to the protective properties of the coating and is a common failure mode.
