Composition and process for imparting a bright blue color to zinc/aluminum alloy
AssigneeHenkel Corporation
InventorsHitoshi Ishii, Takao Ogino
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Abstract
The rapid, low-temperature formation of a bright blue surface on hot-dip zinc/aluminum alloy-plated steel sheet that contains 0.1 to 60 weight % aluminum in the alloy, or on other surfaces of similar chemical composition, using conventional surface-treatment equipment, is achieved by treating the surface with a treatment bath that has a pH of 3.5 to 6.0 and that contains molybdenum compound at 0.2 to 3.0 weight % as molybdenum and simple or complex fluoride at 0.1 to 2.0 weight % as fluorine.
Claims17
A process for imparting a bright blue color to a zinc/aluminum alloy surface that contains 0.1 to 60 weight % aluminum by treatment of the surface with an aqueous liquid treatment composition that has a pH of 3.5 to 6, that does not contain chromium, and that contains a molybdenum compound content of 0.2 to 3.0 weight % calculated as molybdenum and a fluoride content of 0.1 to 2.0 weight % calculated as fluorine.
Dependencies are inferred from the claim text.