Corrosion protection material and method, and use thereof for aluminumalloys
OwnerPierre Mauret, Louis Gachesinventors
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Abstract
A corrosion protection material and method for anon-metal alloys, particularly light aluminum alloys; the method comprises the steps of coating a material to be protected with a layer containing a chromium-free inhibitor, comprising at least one dihydroxyazoic salt having structural unit (a), wherein Y is a salt producing anion and M is a metal; for the same number of moles, protection with an effectiveness comparable to that of chromate inhibitors may thus be achieved; ##STR1##
Claims12
A process for protecting a non-ferrous metallic material against corrosion comprising covering the metallic material with a coating containing at least one dihydroxyazoic salt having a solubility in water of between 0.01 g/l and 3 g/l, having the following structural unit:
- ##STR10## where .gamma. is a salifiable anion and M a metal.
A product for protecting non-ferrous metallic materials against corrosion, comprising a mixture of a binder and a corrosion inhibitor consisting of at least one dihydroxyazoic salt with a solubility in water of between 0.01 g/l and 3 g/l, having the following structural unit:
- ##STR12## where .gamma. is a salifiable anion, and M a bivalent metal, selected from the group consisting of zinc, tin and alkaline earth metals.
Dependencies are inferred from the claim text.