Pretreatment is an essential part of the entire powder coating process. It removes any parts on the surface that may affect the later powder coating. The pretreatment for powder coating can be applied onto a wide range of metal surfaces, including aluminum, mild or galvanized steels, and ferrous and non-ferrous metal components.
What can Pretreatment do?
The pretreatment for powder coating does not just mean clearing. It provides protection for the metal surface. A well-conducted pretreatment can promise the best powder coating effect and make it look great as long as possible. Pretreatment for powder coating should not be underestimated if a desired preparation is expected. It will remove contaminants from the metal surface, making it fully ready for powder coating. It will also make the coating bonded more effectively to the surface, forming seal on the surface that can last longer.
As a finishing treatment, powder coating involve several factors such as material, powder properties, temperature and so on. Several variables may rise in the coating process. Therefore, you need a professional team that understands the machine and has ample application experience in many industries. We are here to give you advice on the purchase and use of the machine.
Available Pretreatment Options
2 kinds of surface pretreatment are currently available, which are Chemical Pretreatment and Shot-blasting.
Chemical Pretreatment
Chemical pretreatment for powder coating refers to the use of chemical materials to treat the surface to make it adaptive for the subsequent powder coating. Common choices used are chromate conversion and zinc phosphate. Chromate conversion can effectively improve the corrosion resistance of metal surface and the bonding property with organic coatings. And the use of zinc phosphate is ideal for the coating onto ferrous metal to prevent rust and corrosion. It makes the items more resistant to knocks, scratches and other daily wear and tear.
The benefits from the use of chromate conversion and zinc phosphate make them popular choices in automobile and machinery making industries. We also have a wide selection of chemicals and options for the best pretreatment. As an expert, we will take the time to evaluate our clients’ workpieces to be coated, followed by our recommendation of the most appropriate pretreatment method to meet their demands.
Shot-blasting
Shot-blasting is another way for the pretreatment for powder coating. When it is used, a high speed jet beam created by compressed air will be used to spray abrasives onto the surface of the workpiece to achieve a certain cleanliness and roughness. The adhesion, appearance and resistance to moisture and corrosion of the coatings can be determined by the shot-blasting quality. If not properly pretreated, corrosion will continue to spread under the coatings, resulting in the falling off of the flakes of the coatings.
Top tip: More heat will be generated during a shot-blasting process, especially for thin or aluminum workpieces. This is good, especially for larger or thicker workpieces that require a longer heating time.
Contact Us
We have more than 15 years of experience in the manufacture of powder coating machines and their applications in different industries. Professional advices from our team will be provided for your pretreatment. We will help your work achieve the highest standard required for the high quality powder coating later.
If you want to learn more about pretreatment for powder coating, please visit China-static.com or contact our Customer Service.
