Patent ID: 7662241

Claim:
A process for protecting an aluminum substrate or a steel substrate against corrosion comprising: providing an aluminum surface to be protected, applying to said surface a protective composition comprising of a pigment grade corrosion inhibitor composition, said protective composition being formed by reacting an organic compound from a group consisting of di-mercapto and poly-mercapto derivatives and their derivatives, with a cationic species selected from a group consisting of Bi(III), Co(II), Cd(II), Ag(I), Sb(III), Ni(II), Li(I), La(III), and Pr(IID, said protective corrosion inhibitor composition having a limited solubility in water of between about 0.01 and about 1000 mmoles/ per liter of water, whereby said corrosion inhibitor is capable of preventing corrosion for at least 2000 hours in salt spray exposure conditions.