Salt corrosion inhibitors
AssigneeRockwell International Corporation
InventorsRobert J. Walter, Bernard J. Gerik
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Abstract
A salt system having a reduced rate of corrosion comprises a salt selected from the group consisting of KNO.sub.3,NaNO.sub.3 and mixtures thereof, and a minor amount of a corrosion inhibitor selected from the group consisting of Li.sub.2 O, Na.sub.2 O, CuO, Mgo, NiO, CaO, Al.sub.2 O.sub.3, Cr.sub.2 O.sub.3, SiO.sub.2, Mn.sub.3 O.sub.4, Ti.sub.2 O.sub.3, Y.sub.2 O.sub.3, Na.sub.2 CrO.sub.4, Na.sub.2 Cr.sub.2 O.sub.7, K.sub.2 CrO.sub.4, K.sub.2 Cr.sub.2 O.sub.7, and mixtures thereof.
Claims1
The salt system which significantly retards corrosion of mild and low alloy steels comprising a salt selected from the group consisting of KNO.sub.3, NaNO.sub.3 and mixtures thereof and a corrosion inhibitor comprising an intimate mixture of a low valence metal oxide selected from the group consisting of Li.sub.2 O, Na.sub.2 O, CuO, MgO, NiO, CaO, and mixtures thereof, and a high valence metal oxide selected from the group consisting of Al.sub.2 O.sub.3, Cr.sub.2 O.sub.3, SiO.sub.2, Mn.sub.3 O.sub.4, Ti.sub.2 O.sub.3, Y.sub.2 O.sub.3, and mixtures thereof.
Dependencies are inferred from the claim text.