Excellent Corrosion Protection from a Single Coat
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In a recent study, the influence of the curing conditions on the corrosion protection properties of coatings on a number of different substrates was investigated. In addition, powder coatings which provide corrosion protection of at least category C4 medium with a single coat were identified. The objective was to find alternatives to the widely used primid systems that provide significantly improved protection against corrosion in the low-temperature range.
Acid-functional polyester powder coatings, which are cross-linked with b-hydroxyalkylamide or aromatic glycidyl ester (Araldite PT910 or PT912), are normally used in Europe for external applications. The specific type of system depends on the application and the properties needed.