In comparison to other painting methods, powder coating is generally longer lasting and more resistant. During the process, dry powder with a negative charge is sprayed through an application gun onto an earthed metal component. Once coated, the piece is cured in an oven to gel the powder with the object. The heat allows the powder to flow across the surface and a cross-link bond is formed.
Other coating processes, such as wet spray paint, can be more prone to scratches, running and temperature interference which decreases their lifespan.
Depending on the powder, finish quality, use and environmental demands, powder coating can exceed 20 years. For example, a typical powder coat on a computer chassis that is used in an office environment will last significantly longer than a powder coat on site machinery. However, there are certain steps that can be implemented to increase longevity.
To increase the lifespan of your powder coating, adding a pre-treatment can greatly benefit the process. Pre-treatment is the process of surface preparation for the substrate before the powder coating process takes place. Doing this properly ensures a higher quality and longer listing finish.
Material, contamination, end-use and warranty requirements will heavily influence the pre-treatment regime. For domestic items, with low use and a fairly clean manufacturing process a simple 2.5 stage spray pre-treatment will suffice. Whereas for architectural aluminium, with long warranty and extensive exposure to the elements, you may need up to a 7-stage non-chrome pre-treatment facility.
There may be different pre-treatment processes you want to include depending upon the material. At Junair, we can help with a bespoke pre-treatment plant that addresses these needs. We can also modify your existing plant if you are looking to change your process. You may want to include shotblasting, spray, immersion, de-rusting systems or a power wash. Take a look at some of the services we offer here at Junair with regards to your pre-treatment plant, to ensure you can produce a high quality product.
One way to increase the length of time a powder coat lasts is by adding an additional primer coat. While the majority of applications only require one single coat, certain applications may require two, including a primer stage. Where appropriate and if applied correctly, a green cured primer prior to topcoat, can vastly increase longevity of the finish.
Adding additional coats requires further preparation, equipment and production capacity. Here at Junair, we know all about this process and we can advise if this solution is right for you
There are two popular types of powder coating processes that both have an impact on the longevity of a powder coat. Both types of powder coat come with their own advantages.
Polyester powder coating is routinely used and is a cost-effective powder coat. This type of powder coat has great chemical and mechanical resistance. With a low curing temperature, this type of coat is better for certain applications, for example, if you will be handling sensitive components.
Epoxy powder coating is a thermoset polymer. A tough coating as it has more chemical and corrosive resistance. Epoxy works with a combination of properties and is ideal as a functional coating for lots of different applications. This process boosts the longevity of the powder coat as it is more durable, but may be less resistant when exposed to certain elements if you are looking for outdoor applications.
Choosing either epoxy or polyester powder coating, or a different type of coat entirely, really depends on your requirements and the application of the finished product. Different types of powder coating can be implemented as part of your powder coating process in your spray booth.
At Junair, we offer a wide range of powder coating systems that can increase the lifespan of your coated components, from a vast range of pre-treatment tools which can be built into your powder coating plant, to bespoke curing ovens to tailor the strength of the coat.
Junair is here to help you meet your powder coating longevity needs and help you find a solution that is right for your business. Get in touch with us to find out more about our powder coating services.
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