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Prepainted galvanized steels have excellent corrosion resistance in atmospheric environments and are widely used in architectural applications. A protective organic coating acts as a barrier against corrosion in atmospheric environments, and the galvanic reaction between the Zn layer and the steel substrate provides sacrificial corrosion protection against red rust formation at the cut edges. To improve resistance against cut edge corrosion and the delamination of the paint layer, anti-corrosive pigments are added to organic coatings. Strontium Chromate (SrCrO4) is well known as an effective anti-corrosive pigment, and is commonly added to organic coatings.1,2) Chromates are reserved in paint layers and are eventually released3–9) before being electrochemically reduced to chromium oxyhydroxide at corrosion sites, which acts as a corrosion inhibitor.10–12) Atmospheric corrosion at and around the cut edges and scratches of painted galvanized steels is associated with several processes: 1) the galvanic corrosion of the Zn layer coupled with the steel substrate, 2) the release of Electrochemical Roles of Anti-corrosive Pigments in Sacrificial Corrosion Protection of Painted Galvanized Steel and their Relation to Organic Coating Delamination

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Electrochemical Roles of Anti-corrosive Pigments in Sacrificial Corrosion Protection of Painted Galvanized Steel and their Relation to Organic Coating Delamination