salt spray testing

Where required TD Finishing can advise on and provide equipment for powder coating products that are required to withstand up to 1,000-hour salt spray testing. Salt spray testing is a standardised method of testing corrosion resistance across a variety of materials and surface coatings.

The testing apparatus used accelerates the corrosion of materials through the creation of a hostile environment within the test chamber.  It achieves this by atomising saltwater into a mist.

The corrosive attack on coated samples is timed and periodically checked. Coatings offering better corrosion resistance will be expected to last longer before showing signs of deterioration and rust.

Salt Spray Testing

Typically for Aluminium coating including for Qualicoat approval a series of dip-tanks for pre-treatment. It will include a combination of caustic/acid etch, towns rinse, Demin rinses and non-chrome treatment.

For contract powder coating and OEM manufacturers of mild steel components, there is an increasing trend of non-chrome conversion coatings utilising a multi-stage spray system with a series of cleaner, conversion coating and Demin rinses.

What are the Benefits of Salt Spray Testing?

Salt spray testing is reliable, quick, repeatable and very well standardised. It makes it a popular benchmark for the testing of corrosion resistance of coatings.  Although it’s not a perfect representation of real-life corrosive environments. It also does not account for U.V, degradation of powder coatings for example.

It is however long-established and quick. This means it can be used to predict corrosion resistance. Not only this, but to ensure continued quality control of a pre-treatment and coating process.

Shorter tests can be carried out during production to ensure each batch has been treated correctly and the complete finishing system is working as designed.

Get in Touch

Therefore, if you are looking to improve your powder coating line, upgrade or improve your products finish/ corrosion resistance then do not hesitate to contact TDfinishing today to discuss; pre-treatment, drying ovens, curing ovens, powder coating and wet spray facilities.
Call us on 0121 520 8884.

If you enjoyed reading this article you may also like to read our previous post on a Pretreatment Systems Decontamination