PPGI Coil Sheet used for construction are mainly affected by ultraviolet rays in sunlight, moisture in the air and harmful substances brought by industrial pollution, reducing their service life. The anti-corrosion of architectural color-coated products is the combined effect of plating, pretreatment film and coating (primer, topcoat and backcoat). This combination is very important and directly affects its service life. In order to improve the on-site performance of the color plate, especially the deformation area of the steel plate, the regulations in the user guide should be followed.
Factors affecting the failure of coated/galvanized steel sheet
The failure process of the color-coated steel sheet is as follows. Coating failure, coating failure and even steel perforation are the key corrosion processes. Therefore, increasing the thickness of the coating layer and adopting a weather-resistant and corrosion-resistant coating layer is the most effective means to prevent the corrosion failure of color-coated steel plates.
Loss of gloss on the layer — discoloration of the layer –chalking of the layer –cracking of the layer — blistering of the coating — white rust at the scratches –peeling off the incision — the large area of the coating peeling off — the large area of the White coating rust– steel plate corrosion and perforation — steel plate failure