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Industrial protective coatings can be surprisingly complicated for the inexperienced user or specifier. For example, when fabricating complex structures, the simple question of when during fabrication to paint can have an array of interesting cost and performance implications. Other issues include tradeoffs associated with degree of surface preparation and inspection for coating coverage. The paper will explore some of the reasons why they can be complicated in the context of four issues that can impact an industrial protective coatings project.
While real time outdoor weathering exposures in benchmark climates, such as South Florida, are highly recommended for determining coating performance and service lifetimes, the lengthy test times required are often problematic. Therefore, outdoor and laboratory artificial accelerated weathering testing has become a mainstay in coatings testing, particularly in the product development phase.
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Besides economic considerations, ecological and regulatory factors play an increasingly decisive role nowadays in the formulation of innovative coating systems. It is therefore no surprise that the call for zinc-free anti-corrosive pigments or those that do not require labeling has steadily increased in recent years. Zinc-free technology is not new. Numerous pigments based on calcium, strontium, aluminum, and magnesium phosphate have been available on the market for a long time.
A new patent-pending resin technology incorporated into the epoxy/polysiloxane part A portion of a two-component coating system, using an amino-silane curing agent, has shown significant improvements in flexibility, gloss and color retention. Corrosion resistance and adhesion to non-sandblasted metal substrates have also shown improvements. The new resin technology may be considered for low-VOC and HAPs coating systems.