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A new acrylic epoxy hybrid (AEH) water based dispersion has been developed for two-components coating applications for several years. This new AEH dispersion can be used to replace the conventional water based epoxy dispersions for concrete and metal coatings. The curing agent selection for the new AEH dispersion is critical for metal applications for both formulation stability and the performance such as corrosion resistance, water resistance and UV durability. This paper discusses the utility of using ζ-potential and water solubility in curing agent selection.
A century ago, automotive companies developed the laboratory salt spray corrosion test method standardized in ASTM B117. Even then they knew this quality control test did not produce realistic exposures. Wet-dry cyclic tests provided modest improvements in correlation and have been used in architectural applications for many years.
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The authors look toward the future of specifying coating projects starting with the traditional prescriptive, means-and-methods, coating formula-based specifications. The popular qualified product list (QPL) approach is presented along with its drawbacks. The design/build (DB) ideal and limitations of specifying only performance is presented.
This paper deals with the issue of surface contaminates analyses presently available on the market. The amount of variations of analyses and more important statements of the results cause great problems on the market. Described in the paper are not only the analyses possible, but also the interpretations belonging to them. However, salt measurements are used worldwide, its basics often appear to be a worldwide mystery. This paper should clarify the most common made mistakes.