For metal castings, our more commonly used surface treatment methods are: mechanical polishing, chemical treatment, surface heat treatment, and sprayed surface. The surface pretreatment of metal castings is to clean, sweep, deburr, degrease, and deoxidize the surface of the workpiece.
1. Surface Pretreatment
In the process of processing, transportation, storage, etc., the surface of metal workpieces often has oxide scale, rust molding sand, welding slag, dust, oil and other dirt. For the coating to be firmly attached to the surface of the workpiece, the surface of the workpiece must be cleaned before painting. Otherwise, it will not only affect the bonding force and corrosion resistance of the coating to the metal, but also make the base metal even if it is coated. It can continue to corrode under the protection of the layer, causing the coating to peel off, affecting the mechanical properties and service life of the workpiece. It can be seen that the purpose of surface pretreatment of metal workpieces is to provide a good substrate suitable for coating requirements, obtain a protective layer of good quality, and prolong the service life of the product.
2. Mechanical Treatment
Mainly include wire brush roller polishing, shot blastingand sand peening.
3. Electrochemical Method
Electrochemical surface treatment uses the electrode reaction to form a coating on the surface of the workpiece, which mainly includes electroplating and anodic oxidation.
4. Chemical Methods
The surface treatment of chemical method has no current effect, and uses the interaction of chemical substances to form a plating layer on the surface of the workpiece. The main methods are chemical conversion coating treatment and electroless plating.
5. Hot Processing Method
The hot processing method is to melt or thermally diffuse the material under high temperature conditions to form a coating on the surface of the workpiece. The main methods are as follows: Hot Dip Plating、Thermal Spraying、Hot Stamping、Chemical Heat Treatment.
ABOUT KEVA
Keva Casting is a professional casting company that focuses on Construction, Machinery, Automobile, Hardware, Pipeline and many other industries.
We provide top quality products with the best service based on our complete production chain including our own mold design, advanced production techniques, and full management of the supply chain. Keva Casting has two factories located in Zhucheng, China's Shandong province.
We use "shell molding", which is a new technique that has been developed in recent years.This new technique has simplified production procedures and reduced air pollution compared with traditional sand casting and investment casting. Shell making and core making are faster to ensure production in enormous quantities. The dimensions and surface finishing are satisfactory for all kinds of industrial requirements. Besides supplying our own formwork & scaffolding systems, our casting products also supply OEM services in various industries.