Imperial Chemical Industries Limited

Glyn R John

Bernard Tury

Edward George Scovell

Noreen L Thomas

Kevin L Birkett

Campbell F Walker

This invention relates to a process for coating a surface of a metal I, such as iron, steel, zinc, copper, tin or aluminum with a hydroxy oxime complex of metal II which may be lead of zinc. The complex can be incorporated in a surface coating composition.

Anti corrosion metal complex compositions

A composition containing a substituted cyclic anhydride and a hydroxy-oxime. The cyclic anhydride may be a succinic anhydride derivative such as dodecenyl succinic anhydride or a polymer containing cyclic anhydride groups such as polyisobutenyl succinic anhydride. The oxime may be 2-hydroxy-5-nonylbenzaldoxime or 2-hydroxy-5-nonylacetophenone oxime. The composition may be used to inhibit corrosion of metals, particularly iron. The composition may also include further components which are effective to reduce metal corrosion.

Composition and use

A process which comprises contacting the surface of a metal with an alkyl or acyl substituted catechol. The contacting may be effected using the substituted catechol alone or in a suitable medium for example as a solution or emulsion. The contacting is effective in providing corrosion inhibition even with lightly rusted iron surfaces.

Corrosion inhibition

The invention relates to a process for contacting a surface of a metal I such as iron, steel, zinc, cooper, tin or aluminum with a hydroxy oxime complex of metal II which may be zinc or lead. Said complex may be incorporated in a surface coating composition.

The invention discloses a process to inhibit corrosion of mild galvanized steel by treatment with an optionally substituted bis(oximinomethyl)alkyl phenol, especially 2,6-bis(oximinomethyl)-4-nonyl or dodecyl phenols.

Corrosion inhibitor

Corrosion inhibition of metals (especially iron, zinc, copper, tin and aluminium and in particular mild steel and the zinc surface of galvanized steel) is provided by treatment with an optionally substituted 2-hydroxy-5-alkylbenzaldoxime wherein the 5-alkyl group contains from 7 to 13 carbon atoms. The benzaldoxime may be applied directly or as a solution in an organic solvent or as an aqueous emulsion. The benzaldoxime may be formulated in a surface coating composition.

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Lowton, United Kingdom

Glyn R John