Method and composition for the prevention or inhibition of corrosion

Claim 1

An improved method of preventing corrosion on a surface, which comprises: (a) forming a coating of from about 2 to 15 mils thick on the surface, with a composition comprising: (i) about 10 to 80% by weight of a rust-inhibitive, grease-like concentrate comprising a thixotropic inorganic/organic complex stably dispersed in an essentially inert liquid oily phase in an amount not to exceed 4 parts, per part of said complex, of said essentially inert liquid oily phase, said inorganic/organic complex comprising an over-based alkaline earth organic sulfonate salt, whereby the crystalline structure of the inorganic portion of said complex is platelet and film-forming in character; (ii) about 5 to 25% by weight of at least one drying oil, said drying oil being miscible in a diluent oil selected from the group consisting of aliphatic hydrocarbon diluents, cycloaliphatic hydrocarbon diluents, aromatic hydrocarbon diluents, and mixtures thereof, boiling at temperatures above 150° C.; (iii) about 0.03-0.6% by weight metal, provided by a first metal drier selected from the group consisting of copper carboxylate compounds, rare earth carboxylate compounds and mixtures thereof; (iv) about 0.1 to 2.2% by weight metal, provided by a second metal drier consisting of zinc carboxylate compounds; (v) about 20 to 60% by weight naphthenic or straight chain paraffinic oils or mixtures thereof; (vi) about 2 to 15% by weight petrolatum; and (b) curing the coating.

Claim 15

A method of prohibiting corrosion on a surface exposed to seawater, which comprises forming a coating up to about 15 mils thick on the surface with a composition consisting essentially of about 30 to 40% over-based calcium sulfonate, about 10 to 20% tung oil, about 30 to 45% naphthenic or straight chain paraffinic oils or mixtures thereof, about 3 to 8% petrolatum, about 0.1 to 0.6% copper provided by copper carboxylate compounds, about 0.2 to 1.1% zinc provided by zinc carboxylate compounds, about 0.06 to 0.3% rare earth metals provided by rare earth carboxylate compounds, and allowing the coating to cure.

Claim 16

A method of prohibiting corrosion on a surface exposed to seawater, which comprises forming a coating up to about 15 mils thick on the surface with a composition consisting essentially of about 30 to 40% over-based calcium sulfonate, about 10 to 20% tung oil, about 30 to 45% naphthenic or straight chain paraffinic oils or mixtures thereof, about 3 to 8% petrolatum, about 0.1 to 0.6% copper provided by copper carboxylate compounds, about 0.2 to 1.1% zinc provided by zinc carboxylate compounds, about 0.06 to 0.3% rare earth metals provided by rare earth carboxylate compounds, and allowing the coating to cure.

Claim 22

A method of prohibiting corrosion on a surface exposed to seawater, which comprises forming a coating up to about 15 mils thick on the surface with a composition consisting essentially of about 30 to 40% over-based calcium sulfonate, about 10 to 20% tung oil, about 30 to 45% naphthenic or straight chain paraffinic oils or mixtures thereof, about 3 to 8% petrolatum, about 0.1 to 0.6% copper provided by copper carboxylate compounds, about 0.2 to 1.1% zinc provided by zinc carboxylate compounds, about 0.06 to 0.3% rare earth metals provided by rare earth carboxylate compounds, up to about 5% polyisobutylene, and allowing the coating to cure.

Claim 23

A method of prohibiting corrosion on a surface exposed to seawater, which comprises forming a coating up to about 15 mils thick on the surface with a composition consisting essentially of about 30 to 40% over-based calcium sulfonate, about 10 to 20% tung oil, about 30 to 45% naphthenic or straight chain paraffinic oils or mixtures thereof, about 3 to 8% petrolatum, about 0.1 to 0.6% copper provided by copper carboxylate compounds, about 0.2 to 1.1% zinc provided by zinc carboxylate compounds, about 0.06 to 0.3% rare earth metals provided by rare earth carboxylate compounds, up to about 5% polyisobutylene, and allowing the coating to cure.