Surface treatment is a process for artificially forming a surface layer on the surface of a base material that is different from the mechanical, physical, and chemical properties of the base body. The purpose of surface treatment is to meet the requirements of product’s corrosion resistance, wear resistance, decoration and other special functions.
Normally, if there is no special requirements on the surface, products after investment casting are just anti-oil rust painted for rust protection. However, there may also have special purposes like improve appearance, protect the surface from external influences, meet special brand requirement, change material properties, ect. In this case, some surface treatments will be applied to investment castings.
Surface Finishing Services for Casting Parts
The most applied surface treatments are:
Color painting: Can be operated according to sample or color number. Secondly used surface treatment method for castings. Mainly used as the surface treatment for steel castings and iron castings.
Powder coating: Better surface coating way than color painting, which is good at environment protection and harmless to workers.
Zinc plating: Suitable for small type of investment castings for its high cost.
Pickling and passivation: Used to protect castings from corrosion and add a protective layer. Specialized for stainless steel castings.
Black oxide: More cost-effective way to prevent investment castings from rusting than painting.
Phosphating treatment: A kind of chemical layer converting process, using used pre-treatment technology.
Polishing: It is the process of creating a smooth and shiny surface by rubbing it or using a chemical action, leaving a surface with a significant specular reflection. Buff polish(which can be mirror or satin finish),Barrel polish, Vibration polish, Electrical polish and so on.
Sand blasting: It is a general term used to describe the act of propelling very fine bits of material at high-velocity to clean or etch a surface. Sand used to be the most commonly used material, but since the lung disease silicosis is caused by extended inhalation of the dust created by sand, other materials are now used in its place. Any small, relatively uniform particles will work, such as steel grit, copper slag, walnut shells, powdered abrasives, even bits of coconut shell. Due to the dangers of inhaling dust during the process, sandblasting is carefully controlled, using an alternate air supply, protective wear, and proper ventilation.
Electroplating: Zinc plating,Chrome plating, Painting, Anodizing, and so on.
Our surface treatments allow us to offer our customers high quality investment castings with surface finish better than 3.2 micron after lost wax precision casting process. We can offer all kinds of surface treatments either finished in-house or from our partner. More and more customers benefit from our wide range of surface treatments service. Together with our machining and heat treatment capabilities, our surface treatment capabilities enable us become your “One Stop Shop” investment casting supplier. Please contact us for details of other finishing on metal parts.