Dart Industries Inc.

Philip D Readio

John L Allan

Richard F Zuendt

Ajay M Bengali

Moenes L Elias

Ronald A Kent

Judit Cestero

Kollengode V Srinivasan

Improved color, brightness and corrosion resistance are imparted to metal surfaces such as zinc plated surfaces, by treatment with a non-toxic solution comprised of sulfuric acid, hydrogen peroxide, a silicate and at least one cationic triarylmethane dye. Certain organophosphorus compound additives further enhance the corrosion resistance.

Non-chromate conversion coatings

Improved brightness and corrosion resistance are imparted to metal surfaces such as zinc plated surfaces, by treatment with a non-toxic solution comprised of sulfuric acid, hydrogen peroxide, a silicate, certain primary organophosphorus compound promoters and at least one secondary promoter selected from ascorbic acid, boric acid, gluconic acid, glycolic acid, tartaric acid and salts of said acids.

Improved brightness and corrosion resistance are imparted to metal surfaces such as zinc plated surfaces, by treatment with a non-toxic solution comprised of sulfuric acid, hydrogen peroxide and a silicate. Certain organophosphorus and organonitrogen compound additives further enhance the corrosion resistance.

Improved metal dissolution rates are obtained when using a solution containing sulfuric acid, hydrogen peroxide and an effective amount of a mono- or dihydroxy-substituted cycloparaffin.

Dissolution of metals utilizing a H.sub.2 O.sub.2 -H.sub.2 SO.sub.4

Improved metal dissolution rates are obtained when using a solution containing sulfuric acid, hydrogen peroxide and an effective amount of a ketone soluble in the solution.

Dissolution of metals utilizing a H.sub.2 O.sub.2 -sulfuric acid

Clean etchings at high rates are obtained using a solution containing sulfuric acid, hydrogen peroxide, a catalytic amount of a selenium compound of a +4 oxidation state and a secondary or tertiary alcohol.

Improved metal dissolution rates are obtained when using a solution containing sulfuric acid, hydrogen peroxide and certain primary diols.

Dissolution of metals

Clean etchings at high rates are obtained using a solution containing sulfuric acid, hydrogen peroxide, a catalytic amount of a selenium compound of a +4 oxidation state and t-butyl hydroperoxide.

Dissolution of metals with a selenium catalyzed H.sub.2 O.sub.2 -H.sub.2

An aqueous acid nickel electroplating bath containing as a brightener-leveling agent the reaction product of an acetylenic diester of a halogenated saturated aliphatic acid with a heterocyclic compound containing a tertiary nitrogen atom. The brightener may have the general formula ##EQU1## wherein R.sub.1 and R.sub.2 are hydrogen, halogen or a hydroxy, carboxy, carboxyester, sulphoxy, alkyl, amino or amido group;

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Sparta, NJ, United States of America

Philip D Readio