Allnex has recently developed a generation of modified superdurable polyesters for powder coatings, demonstrating improved corrosion resistance for ACE applications. The binders based on these polyesters, hardened with b-hydroxyalkylamide, are expected to compensate observed performance gaps of novel environment-friendly anti-corrosive pre-treatment solutions like nano-ceramic systems, relative to current systems like zinc or iron phosphate on steel, and yellow chromate on aluminum surfaces.
The objective of this article is to illustrate our company’s findings that have improved corrosion resistance after salt-spray tests (ASTM B-117) on both pre-treated and untreated shot-blasted substrates for ACE applications. It will also cover the potential use for the same application of alternative binders based on triglycidyl-isocyanurate (TGIC- Araldite® PT 810) and blend of triglycidyltrimellitate and diglydicylterephthalate (PT 910-Araldite PT 910).