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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.
Thus to establish the precision of ISO 20340 Annex A six laboratories participated in a round-robin evaluation of ISO 20340 annex A test method for the first time. The aim was to estimate the repeatability and the reproducibility of this test.
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Zinc rich coatings have long been used in the protective coatings industry as one of the primary means of steel substrate protection against corrosion. The primary protection mechanism has historically been galvanic sacrificial loss of zinc metal and the simultaneous formation of protective zinc oxides and salts. Various standards and customer specifications exist to ensure that the coating will provide the necessary corrosion protection for the life of the asset.
This paper will address conditions assessment, test procedures and criteria necessary to make informed decisions on overcoating or not overcoating an aged coating system. It will cover rating of adhesion and film integrity, determination of overcoating risk factors and a selection process for appropriate overcoat systems.