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Powder Coating is a type of dry coating, which is applied electro-statically and then cured under intense heat to allow for penetration of the powder to the metal. Usually Powder Coatings are tougher than conventional liquid paints and provide for harder finishes.
The powder coating process involves three steps:
1. Product preparation and pre-treatment
2. Powder Application
Product Preparation and Pre-Treatment
Preparing the product for the powder application as well as the pre-treatment is very important and could determine the durability of the powder coating as well as the powder not peeling back off. Limited knowledge of correctly preparing products or even careless-ness could lead to railings having the powder coating peeled off and having only a limited amount of months with the powder fixed on to the metal.
Removal of all soil, oil, lubrication greases, metal oxides, and welding scales are necessary prior to the powder coating application. Usually this can be done by a variety of chemical and mechanical methods depending on the size and material of the product, the type of soil being removed, and the performance requirement of the finished product.
The most common way of applying powder coatings to metal objects is to spray the powder using an electrostatic gun. The gun produces an electric charge on the powder which then is immediately sprayed onto the grounded object .It is important to note that the use of high quality powder is recommended to achieve results of durability and a long lasting finish.
When the powder is exposed to high temperatures it begins to melt and flow evenly throughout the metal. The curing process requires a certain degree of temperature for a certain amount of time, in order to fully cure and produce the correct film properties
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