Compositions: coating or plastic – Coating or plastic compositions – Corrosion inhibiting coating composition
Reexamination Certificate
2000-03-02
2008-09-09
Zheng, Lois (Department: 1793)
Compositions: coating or plastic
Coating or plastic compositions
Corrosion inhibiting coating composition
C106S014050, C106S014210, C148S253000, C148S256000, C148S275000, C205S080000, C205S124000, C205S197000, C205S217000, C205S219000, C205S318000, C205S320000, C205S323000
Reexamination Certificate
active
07422629
ABSTRACT:
Electrolysis using a suitable electrolyte provides a completely nonsludging zinc phosphate conversion coating process that produces a high quality conversion coating in a very short time. The suitable electrolyte contains at least water, dissolved nitric acid, and dissolved zinc cations and optionally also contains m chemically distinct species of cations other than zinc and n chemically distinct species of anions other than anions derivable by ionization of phosphoric and nitric acids, each of m and n independently being zero or a positive integer. Preferably, the liquid composition contains as additive at least one selection from nitrous acid, permanganic acid, peroxysulfuric acid, hydrogen peroxide, chloric acid, perchloric acid, nitrobenzenesulfonic acid, hydroxylamine, starch/phosphoric acid esters, fluorine compounds, and salts of the preceding; and/or the metal substrate is subjected to cathodic electrolysis after the workpiece has been brought into contact with a weakly basic aqueous colloidal solution that contains titanium oxide, titanium hydroxide, and zinc phosphate.
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Ishikura Kazuhiro
Kawaguchi Jun
Manmi Tomoyuki
Henkel Kommanditgesellschaft Auf Aktien
Woodcock & Washburn LLP
Zheng Lois
Zheng Lois L
LandOfFree
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