The surface pretreatment of steel plates refers to the treatment process of surface rust removal and a primer coating on the steel sheet under the condition of raw materials. The surface pretreatment of the steel plate includes two parts: steel plate blasting pretreatment and painting treatment.
Steel plate surface pretreatment
The steel plate shot blasting pretreatment is to accelerate the abrasive (steel shot, steel wire section, angular steel grit, etc.) by the centrifugal force generated when the high speed blasting machine rotates at a high speed, and the abrasive is shot at a high speed on the surface of the treated steel to produce a blow and The grinding action removes the corrosion of the scale of the steel oxide on the surface of the steel, so that the surface of the steel is exposed to the metallic color and exhibits a certain roughness so that the coating adheres.
Spraying treatment refers to a spraying process in which the steel plate after shot blasting is automatically sprayed by a high-pressure automatic spray gun to obtain a uniform paint film on the surface of the steel sheet.
Steel plate surface pretreatment characteristics
Shot Blasting Process
Shot blasting not only can quickly and accurately remove rust and scale, but after shot blasting, the steel plate is evenly cleaned and has uniform roughness, which can improve the adhesion of the coating during coating and prolong the service life of the coating.
Improve the fatigue strength and corrosion resistance of materials
When shot blasting, the surface of the steel plate is strengthened by the impact of the weak shot, which improves the fatigue strength and corrosion resistance of the material and eliminates the internal stress of the weld. At the same time, the hull and other parts are subjected to strong projectile ejection during the overall rust removal of the shot blasting. It will expose the hidden cracks on the board or the excessive corrosion of the shell, which can play a role in comprehensively checking the quality of the shell.
Steel plate processing tools and equipment
The types of steel plate cutting tools generally include flame cutting, laser cutting, wire cutting, shearing machines, plasma cutting machines, and ultra-high pressure water cutting. The most basic equipment generally includes:
Drilling machine: used to machine holes in iron plates.
Planer: used to machine the plane of the iron plate.
Oxygen cutting: used to cut iron plates.
Electric welding: used to weld iron plates to other workpieces.
In the special thick plate steel cutting process, the commonly used tools include cutting tools, welding tools, drilling tools and polishing tools. Electric cutting machines, electric welders, electric drills, bench drills, grinders, and small lathes.