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.
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 paiting, 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 pretreatment technology.
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 treatmens 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.