Home
Always one step ahead,constantly strive for new processes.
A fully integrated supplier of zinc, aluminum and magnesium die casting, and insert molding.
Always one step ahead,constantly strive for new processes.
A fully integrated supplier of zinc, aluminum and magnesium die casting, and insert molding.
Always one step ahead,constantly strive for new processes.
A fully integrated supplier of zinc, aluminum and magnesium die casting, and insert molding.
Always one step ahead,constantly strive for new processes.
A fully integrated supplier of zinc, aluminum and magnesium die casting, and insert molding.
Always one step ahead,constantly strive for new processes.
A fully integrated supplier of zinc, aluminum and magnesium die casting, and insert molding.
Always one step ahead,constantly strive for new processes.
A fully integrated supplier of zinc, aluminum and magnesium die casting, and insert molding.
Always one step ahead,constantly strive for new processes.
A fully integrated supplier of zinc, aluminum and magnesium die casting, and insert molding.
Always one step ahead,constantly strive for new processes.
A fully integrated supplier of zinc, aluminum and magnesium die casting, and insert molding.
Always one step ahead,constantly strive for new processes.
A fully integrated supplier of zinc, aluminum and magnesium die casting, and insert molding.
Overview

In most cases, a die cast product has to undergo the last processes called surface finishing prior to its assembly. The surface finish can offer durability, protection, as well as a decorative appearance to a die cast component. Since surface finishing choices range from the performance to appearance, it is always better to communicate your application requirements with our team in the early design stage. That is because specific features of several die-cast component designs affect the surface finish quality. For instance, the parting lines, gates, and ejector pins can affect the output. Therefore, it is better to evaluate your best design as well as surface finishing options with due consultation with the SinoForming team.

 



The three main reasons for the application of specific coatings and finishes to die cast components are these:


● Meet cosmetic/decorative appearance requirements.

● Enhance resistance to wear.

● Provide a protective barrier against environmental or galvanic corrosion. 

In certain cases, special shielding specifications or pressure tightness requirements have to be met.


Special EMI/RFI shielding requirements.

100% pressure tightness requirements.          

Finishing Steps and Alternatives


Depending on requirements to meet durability, protection and cosmetic appearance specs, most Al,Mg and Zn die cast components will receive from one to three standard post-casting finishing steps: deburring, conversion or combined conversion functional coating, and a final surface finish coating.

Post-Trim Deburring – Tumbling, Deburring and Bead Blasting.

Surface Conversion Coating - Example: Chromate conversion coating.

Combined Conversion Coatings/Functional Finishes - Such as anodizing.

Final Cosmetic Surface Finish - Such as plating and painting.

Additional Post-Casting Operations - Such as silk-screening or pad printing, and “soft-touch” clear coatings, with pressure-tight specifications for air- or water-sealed applications, die castings may require resin impregnation.                     

Choose the Right Die Casting Finishing Process

Many different types of surface finishing options are offered for die-cast parts. Generally, we can handle various surface finishing requirements. Depending on your requirement, any of the following shall apply.

Tumble Finishing and Vibratory Finishing, Bead Blasting (Manual and automated), Cryogenic deburring, Polish & Buff, Trivalent Clear Chromate, Yellow Chromate, Clear chromate, Anodizing, Hard Anodizing, micro-arc oxidation (MAO), powder coating, painting, Electroless Nickel Plate, Copper, Nickel, Chrome Plating E-coating, PVD.


                           

Trivalent Clear Chromate
Environmentally friendly Trivalent clear chromium is now a proven, economical alternative to widely used hexavalent chromium coatings, offering high corrosion resistance for Al, Mg & Zn die cast parts in a wide range of applications. With a bright, co
Zinc Black
This is a process in which a relatively thick black phosphate film is imparted to the casting to protect against humidity and moderately corrosive atmospheres. This finish is not usually proposed as a stand-alone corrosion barrier, but rather is a paint p
Painting
Lacquers and paints can easily be applied to die cast parts and work for both decorative and protective purposes. For the best adhesion of any type of paint it should be applied after pre-treating the casting with a phosphate or chromate-based passivation
Chromate Conversion Coatings
Also known as Chem-Film. Chromate conversion coating is a type of conversion coating that can be applied to passivate aluminum and zinc die casting components. These are chemical immersion treatments which produce a thin protective film on the aluminum an
Chrome-Free Chemical Conversion Coating
Such as Manganese-Calcium Phosphate Coatings, it is routinely applied on magnesium alloys for consumer and various other applications.
Electrophoretic deposition (EPD)
Also known as electrophoretic painting or Electrostatic Coating (E-Coating), it is a manufacturing process that employs charged particles to more efficiently paint a workpiece. E-coating process is dipping electrically conductive parts into a tank of pai
Tin Plating
Tin plating is the process of depositing a coating of solderable tin plating onto the surface of a material via an electrical current. Electroplating tin is an extremely cost-effective process. Tin is a silvery, blue-white metal that is ductile, solderabl
Nickel Plating
Nickel Plating is a yellowish white, hard reflective finish used for wear resistance, solderability, or dimensional restoration. Nickel plate is often applied over copper and under chromium for a decorative finish. For applications requiring bright nickel
Electroless nickel plating
It is an auto-catalytic reaction used to deposit a coating of nickel on a substrate such as aluminum die casting components. Unlike electroplating, it is not necessary to pass an electric current through the solution to form a deposit. This plating techni
Copper-Nickel-Chrome Electroplate
This has been one of the workhorses finishes for outdoor and corrosive applications for many years. On die casting it begins with a thin layer of cyanide (non-acid) copper flash to protect the casting against the acidity of subsequent baths. Next comes a
Anodizing
Or anodization, is an electrolytic passivation process. The process works by treating the component as an anode electrode in an electrical circuit. The purpose is to increase the thickness of the natural oxide layer on the surface of the component. The re
Powder Coating
Powder coating is a type of coating that is applied as a free-flowing, dry powder. The main difference between a conventional liquid paint and a powder coating is that the powder coating does not require a solvent to keep the binder and filler parts in a
PVD
PVD (physical vapor deposition) coating is a process in which a solid material is vaporized in a vacuum and deposited onto the surface of a part. These coatings are not simply metal layers though. Instead, compound materials are deposited atom by atom, fo
Micro-arc oxidation
Micro Arc Oxidation is an electrochemical process of oxidation that is performed by creating micro-discharges on the surface of components immersed in an electrolyte. The process is applied to Magnesium die casting to grow a dense, ductile nano-ceramic ox
Teflon
Teflon is a thermally cured solid film lubricant. It provides improved torque/tension control, good corrosion resistance, very good chemical resistance, and good abrasion resistance.
Impregnation
Impregnation seals the porosity in metal components. It creates watertight parts. It is an extremely viable surface finishing option to enhance the yield as well as reduce the scrap. Plus, it is a wonderful option to use post machining when removing a die