초록 ▼

A solution containing pentavalent vanadium is applied to a metal surface subsequent to conversion coating. The solution contains pentavalent vanadium ions which may be obtained from a sodium metavanadate or sodium metavanadate/orthovanadate solution that is acidified with an acid. Vanadium pentoxide

A solution containing pentavalent vanadium is applied to a metal surface subsequent to conversion coating. The solution contains pentavalent vanadium ions which may be obtained from a sodium metavanadate or sodium metavanadate/orthovanadate solution that is acidified with an acid. Vanadium pentoxide may be dissolved in a base such as sodium hydroxide, potassium hydroxide or lithium hydroxide to form a basic concentrate which can be acidified conveniently after dilution. In one disclosed embodiment, the solution comprises vanadium pentoxide, sodium hydroxide, nitric acid and water which is applied to a phosphate conversion coated surface than rinsed with deionized water prior to priming and painting.

대표청구항 ▼

An aqueous solution for rinsing metal surfaces subsequent to a conversion coating, consisting essentially of an aqueous solution including pentavalent vanadium formed from at least one liquid concentrate which when combined in a working bath contains: (a) from 10 to 100 parts per million a vanadium-

An aqueous solution for rinsing metal surfaces subsequent to a conversion coating, consisting essentially of an aqueous solution including pentavalent vanadium formed from at least one liquid concentrate which when combined in a working bath contains: (a) from 10 to 100 parts per million a vanadium-containing compound selected from the group consisting of vanadium pentoxide, alkali metal vanadate, ammonium vanadate, vandium pentafluoride, vanadium oxytrichloride, vanadyl-containing species, vanadium tetroxide, vanadium tetrachloride, vanadium tetrafluoride, vanadium trichloride, vanadium dichloride, and vanadium metal; (b) an alkali selected from the group consisting of alkali metal hydroxide, alkali metal oxide, and ammonium hydroxide; and (c) an acid selected from the group consisting of nitric acid, phosphoric acid, sulfuric acid, hydrofluoric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid, fluoroboric acid, fluosilicic acid, mono-fluorophosphoric acid, hexafluorophosphoric acid, fluorosulfuric acid, perchloric acid, perbromic acid, periodic acid, phytic acid, carboxylic acid and sulfonic acid, and wherein the aqueous solution has a pH of about 4 to 4.5.