ASTM D6386 PDF

Preparing surfaces of new and partially weathered galvanized steel for powder coating is addressed in Practice D This practice covers surface preparation on iron and steel products and hardware that have not been painted previously. Galvanized surfaces may have been treated with protective coatings to prevent the occurrence of wet storage stain. This practice does not apply to sheet galvanized steel products nor to the coil coating or continuous roller coating processes.

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The first notable difference is D allows for the application of wash primers i. D does not allow for these types of preparation of the galvanized coating prior to application of powder coating. Thermal pretreatment of galvanized steel is necessary prior to powder coating to prevent outgassing of the galvanized coating during the baking step in the powder coating curing process. Outgassing occurs when moisture trapped in the outer layer of the coating evaporates as the galvanized steel is heated when the powder coating is baked on.

The result of outgassing is pinholing or blistering in the powder coating. D gives guidance for oven temperatures for preheating. The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel. This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability.

The information provided herein is not intended as a representation or warranty on the part of the AGA. Anyone making use of this information assumes all liability arising from such use.

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Difference Between ASTM D6386 and ASTM D7803

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Historical Version s - view previous versions of standard. More D Preparing surfaces of new and partially weathered galvanized steel for powder coating is addressed in Practice D This practice covers surface preparation on iron and steel products and hardware that have not been painted previously. Galvanized surfaces may have been treated with protective coatings to prevent the occurrence of wet storage stain. This practice does not apply to sheet galvanized steel products nor to the coil coating or continuous roller coating processes.

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ASTM D6386

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