Haoyuan could provide high quality aluminum die casting with various surface treatment requirements.Now we would like to introduce some main surface treatments.

1.Anti-rust

Anti-rust is always done by die casting foundry if there is no special requirement on casting surface.We could use anti-rust oil or anti-rust water to prevent rusting during the delivery by sea or by air.

2.Painting

Painting is also commonly used after shot blasting of aluminum die casting.We could paint with different colours according to customers' drawing.One day,a customer sent us a drawing of aluminum die casting,in the drawing marked letters"paint John Deere green before machining".For such painting,we need to paint  according to customer's colour disk.Thus to ensure the painting colour is what our customer needs.

3.Black oxide

The usage of Black oxidization for aluminum die casting is to prevent rusting also,it is more cost-effective comparing with painting.And will heating castings to certain temperature,but do not worry,it will have no effect on internal organization of parts.

4.Powder coating

Comparing with painting,powder coating has less harmness on both environment and workers.

5.Zinc plating

Zinc plating is usually adopted when the length of aluminum die casting is smaller than 300mm and the weight is no more than 0.5kg.We could also do zinc plating for larger aluminum die casting,but the cost is high.

6.Pickling & passivation

Pickling&passivation is not for all aluminum die casting,it is only suitable for stainless steel aluminum die casting.

7.Case hardening

Case hardening is a way that make surface hardness to required hardness,but the hardness of internal section is still low.

8.Phosphating treatment

Phosphating treatment is widely used pretreatment technology, a kind of chemical layer converting process. Such process are mainly used as the surface treatment for steel castings and iron castings. Sometime, they are also used for the ferrous metal castings, such as aluminum die castings or zinc castings.