Finishing Publications &
Metal Finishing Information Services

Online Resources - Troubleshooting

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Chromate (hexavalent) conversion coatings


Typical cause

Analysis to confirm cause


Colour too weak

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Uneven coating

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Dull/drab coating of blue or iridescent films. (usually associated with a coating that is too thick)

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Adhesion poor 

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Corrosion resistance poor  -  drying too hot (coating is the correct colour)

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Damaged film

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