1. Chemical treatment
The first thing is to use acidic or alkaline solution to react with oxide Bai and oil on the surface of the workpiece to dissolve it in acidic or alkaline solution to remove rust, oxide scale and oil on the surface of the workpiece. Then use nylon brush roller or 304 stainless steel wire (acid and alkali resistant solution made of steel wire brush roller) to clean up, and you can reach the destination.
2. Mechanical treatment
It mainly includes wire brush roller polishing method, shot blasting method and shot peening method.
The polishing method is that the brush roller is driven by the motor, and the brush roller rotates at high speed on the upper and lower surface of the strip in the opposite direction of the rolling piece movement to brush off the oxide scale. The iron oxide scale should be washed out by closing the circulating cooling water flushing system.
Shot blasting finishing is a method of using centrifugal force to accelerate the shot and shoot it to the workpiece for derusting finishing. However, due to the poor flexibility of shot blasting, limited by the site, there is some blindness in finishing the workpiece, and it is easy to produce a dead angle in the inner and outer surface of the workpiece. The equipment structure is disordered, there are many vulnerable parts, especially the blade and other parts wear quickly, there are many maintenance man hours, high cost and large one-time investment.
Shot peening is used for surface treatment, which has strong striking force and obvious finishing effect. However, shot peening is easy to deform the sheet workpiece, and the metal substrate is deformed when the steel shot hits the surface of the workpiece (no matter shot blasting or shot peening).
Because Fe3O4 and Fe2O3 have no plasticity, they peel off after crushing, and the oil film deforms together with the material, so shot blasting and shot peening can not remove the oil stain on the workpiece with oil stain.
3. Electrochemical method
This method is to use the electrode response to form a coating on the surface of the workpiece. The first way is to:
Electroplating: in the electrolyte solution, the workpiece as the cathode, under the effect of external current, make its surface constitute a coating process, known as electroplating. The coating can be metal, alloy, semiconductor or containing all kinds of solid particles, such as copper plating, nickel plating, etc.
Oxidation: in the electrolyte solution, the workpiece is the anode. Under the effect of external current, the process of forming an oxidation film on the surface of the workpiece is called anodizing, such as anodizing of aluminum alloy.
The oxidation treatment of steel can be carried out by chemical or electrochemical methods. The chemical method is to put the workpiece into the oxidation solution, relying on the chemical effect to form an oxide film on the surface of the workpiece, such as the bluing treatment of steel.
Article from: bathroom copper accessories manufacturers http://www.jmyilin.com/
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