Die casting is a popular manufacturing process used to produce metal components in a variety of near net shapes and sizes. The process involves injecting molten metal into a mold, where it cools and solidifies into the desired shape. However, before shipping the products off to the client, the die cast parts are required to undergo a series of finishing processes to prepare it for use. These finishing processes ensure that the completed die cast parts meet the necessary aesthetic requirements, are well protected against the effects of oxidation and corrosion, as well as improve the parts’ wear resistance.
The most common post-casting finishing processes used on die cast components are:
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Post-Trim Deburring
This process removes any sharp edges or burrs from the die cast parts that may have been caused by the trimming process. This is done to prevent injuries and to improve the aesthetics of the finished product.
Surface Conversion Coating
Conversion coating is an important post-casting finishing process that will fully remove any contaminants such as oil or other types of mold release agents from the surface of the die cast parts. This ensures that the surface is clean and ready to accept a coating or other finishing process.
Combined Conversion Coating
Combined conversion coatings are applied when a die cast component requires a specific function such as resistance to corrosion or enhancements to its aesthetic properties. These coatings are applied after the surface conversion coating process and provide an additional layer of protection and/or beauty to the casting.
Final Cosmetic Surface Finishings
Once the surface of the die cast part is clean and free of contaminants a surface coating is often applied to improve its durability and appearance. These include:
1. Powder Coating
One of the most common types of coating used in die castings is powder coating. This process involves applying a dry powder to the surface of the casting, which is then cured using heat to create a durable finish.
2. Painting
Apart from powder coating, liquid polyurethane paint or some other water-based finish is used to protect the die cast components. This is another finishing step used to enhance the appearance of the casting as well as provide additional protection from corrosion.
3. Anodising
Anodising is an electrochemical process that creates a thin oxide film on the surface of the metal. This film provides increased resistance to corrosion and wear, and can also be used to change the colour of the die cast part.
4. Plating
Plating is another electrochemical process that deposits a thin layer of metal onto the surface of the die cast part. The types of metals used for plating include the likes of Brass, Bronze, Cadmium, Chromium, Nickel, and Tin. This finishing step is often used to improve the appearance or function of the casting. For example, plating with Chromium can increase the shine and durability of the surface.
Choose EKO for Your Die Casting Needs
There are a variety of post-casting finishing processes that can be used to improve the function and appearance of die cast components. The most common finishes include surface conversion coating and final cosmetic surface finishings. By understanding the different options available, you can choose the best finish for your specific application. Here at EKO Industries, you can be sure that your die cast components will receive the highest quality post-casting finishings available, as you work with materials experts who have been in the business for over 20 years. Contact us today to find out more.
