We all know that the surface of the workpiece must be cleaned before painting, otherwise, not only affect the bonding force of the coating and metal and corrosion resistance, but also will make the base metal even with the coating protection can continue to corrosion, so that the coating peeling, affect the mechanical properties and service life of the workpiece.Do you know what surface treatment methods are?Let us understand together below!
1. Manual processing:
This is also the simplest surface treatment, such as a scraper, wire brush or grinding wheel.The surface of the workpiece can be removed by hand rust and oxide skin, but manual processing labor intensity, low production efficiency, poor quality, cleaning is not complete.
2. Chemical treatment:
This way of surface treatment is mainly the use of acidic or alkaline solution and oxide on the surface of the workpiece and the oil produces chemical reaction, make its dissolved in acid or alkaline solution, to remove surface rust scale and oil pollution, recycled nylon brush roller or 304 stainless steel wire brush roller clean can achieve a goal.Chemical treatment is suitable for cleaning sheet parts.
3. Mechanical treatment:
It mainly includes steel wire brush roller polishing, shot blasting and shot peening.The polishing method is that the brush roller is driven by the motor, and the brush roller rotates at a high speed to remove the iron oxide from the upper and lower surfaces of the strip in the opposite direction to the rolling part.The brushed iron oxide sheet is flushed away by closed circulation cooling water flushing system.Shot blasting cleaning is a method to accelerate the projectile by centrifugal force and hurl it to the workpiece for derusting and cleaning.
4. Plasma treatment:
Plasma or the plasma, it is composed of positively charged particles of positive and negative particles (including positive ions, negative ions, electrons, free radicals and all kinds of active group, etc.) of the collection, including positive and negative charge equal so called plasma, is in addition to solid, liquid, and gaseous material existence of the fourth state – plasma.