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US 5,683,751 AGranted
Process for surface treatment of sheet steel partially coated with zinc or zinc alloy
AssigneeSollac
InventorsHerve Derule, Jean Steinmetz
Life of this patent
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Abstract
An aqueous solution useful for protecting steel from corrosion containing an alkaline aliphatic monocarboxylic acid salt having a linear chain of 6 to 12 carbon atoms, a triazole or diazole hydrocarbon and a non-ionic surfactant, the solution having a pH below 7. This aqueous solution is especially suited to the treatment of sheets at the outlet of an electrogalvanization line, particularly in a chloride medium.
Claims8
A process for surface treatment of a sheet steel wholly or partially coated with a layer of zinc or zinc alloy, in which
- a) the surface of said sheet is treated with an aqueous corrosion-inhibiting solution to deposit a film of said solution on said surface,
- b) said film is dried on said surface, and
- c) optionally oil is applied to said surface having said dried film thereon,
- wherein said aqueous solution comprises at least one alkaline earth metal or alkali metal aliphatic monocarboxylic acid salt having a linear chain of 6 to 12 carbon atoms, at least one of a triazole or diazole hydrocarbon and at least one non-ionic surfactant, and wherein the pH of said solution is at a value below 7.
1 more element
Dependencies are inferred from the claim text.