Metal surface treatment before powder coating processing methods one: surface treatment before powder spraying.In order to remove all kinds of foreign objects (such as oil, rust, dust, old film, etc.) attached to the surface of the object, a good substrate suitable for the coating is provided to ensure that the coating has good corrosion resistance, decorative properties and some special functions. The surface of the object must be pretreated before the powder coating is applied. The work done by this kind of treatment is collectively referred to as pre coating (surface) treatment or surface pretreatment.
Metal surface treatment before powder coating processing method two: manual processing
Such as scrapers, wire brushes or grinding wheels, etc. By hand processing, the rust and oxide scales on the surface of the workpiece can be removed, but manual processing has great labor intensity, low production efficiency and poor quality.
Metal surface treatment before powder coating processing method three: chemical treatment
The chemical reaction between acid or alkaline solution and the oxide and oil of the surface of the workpiece is mainly used to dissolve it in acid or alkaline solution to remove the rust oxide skin and oil from the surface of the workpiece. Then, the brush roller or 304# stainless steel wire made of nylon (steel wire brush made from acid alkali solution) is cleaned and cleaned. The goal is achieved. The chemical treatment is adapted to the cleaning of thin plates, but the disadvantage is that if the time is not properly controlled, even adding corrosion inhibitor can cause the corrosion of the steel. For the more complex structure and the porous parts, after acid solution, the residual acid in the slot or hole is difficult to clear. If it is not handled properly, it will become a hidden danger after corrosion. After the corrosion, the chemical volatilization is easy to volatilize, the cost is high, the chemical discharge after treatment is difficult. If it is not handled properly, it will cause serious pollution to the environment. With the improvement of people's awareness of environmental protection, this method is being replaced by mechanical treatment.