Pipe member for buried conduit with corrosion protection and process therefor
AssigneePont-A-Mousson S.A.
InventorsJean-Marc Pedeutour, Gerard Nouail, Jean Bello
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Abstract
A cast iron piping system element has an outer coating comprising a first, inner porous layer consisting of zinc/aluminum alloy containing from 5 to 60% of aluminum, and a second, outer pore occluding layer of an organic or mineral binder in an aqueous, solvent or powder phase with a thickness of 100-140 .mu.m.
Claims17
An iron pipe member for a piping system buried in the earth, provided with an external coating for galvanic protection against soil corrosion, said coating comprising:
- a) a porous inner coat of zinc-aluminum alloy containing 5% to 60% of aluminum applied directly to an outer surface of the pipe member;
- and
- b) a porous outer pore-sealing coat of one of an organic and mineral binder in one of an aqueous, solvent, and powder phase, and having a thickness between 100 and 140 .mu.m applied over the inner coat.
A method for protecting an iron pipe member for galvanically a buried piping system against soil corrosion, comprising the steps of:
- a) applying a porous inner coat of zinc-aluminum alloy containing 5% to 60% of aluminum directly to an outer surface of the pipe member, and
- b) applying a porous outer pore-sealing coat of one of an organic and mineral binder in one of an aqueous, solvent, and powder phase, and having a thickness between 100 and 140 .mu.m over the inner coat.
Dependencies are inferred from the claim text.