Patent ID: 6475299
Filing Date: 2002-11-05
Classification: C08G,C09D,C23C,H05K

Abstract:
A conversion coating composition, comprising:based on the composition, 0.1-30% by volume of sulfuric acid; 0.1-15% by volume of hydrogen peroxide; 0.01-10% by weight of an organic acid; 0.1-30% by weight of a nitrogen compound; 0.01-10% by weight of an organic silicate and or an organic titanate; and at least one additive selected from the group consisting of a film forming auxiliary, an etching rate controller, a reaction promoter and a stabilizer, and wherein the organic acid comprises at least one selected from the group consisting of (i) acetic acid, (ii) propionic acid, (iii) glycolic acid, (iv) citric acid, (v) taric acid, (vi) maleic acid, (vii) malonic acid, (viii) succinic acid, (ix) phthaic acid, (x) benzoic acid, (xi) acrylic acid, and (xii) anhydride of acetic acid, propionic acid, glycolic acid, citric acid, tartaric acid, maleic acid, malonic acid, succinic acid, phthalic acid, benzoic acid, and acrylic acid, wherein the film forming auxiliary comprises at least one selected from the group consisting of (i) hydroquinone, (ii) resorcinol, (iii) pyrocatechol, (iv) pyrogallol, (v) derivatives of hydroquinone, resorcinol, pyrocatechol, and pyrogallol, and (vi) organic sulfur compounds, in an amount of 0.1-20% by weight, if present, based on the weight of the conversion coating composition, wherein the etching rate controller comprises at least one selected from the group consisting of N-methyl-2-pyrrolidone, N-cyclohexyl-2-pyrrolidone, 2-pyrrolidone, dimethyl formamide, dimethyl acetamide, tetrahydrofuran, acetonitrile, dioxane, all lactate, alkyl glycolate, alkyl phosphate, ketone, alcohol, and combinations thereof, in an amount of 0.1-30% by weight, if present, based on the weight of the composition coating composition, wherein the reaction promoter comprises at least one selected from the group consisting of ammonium peroxysulfate, sodium peroxysulfate, potassium peroxysulfate, sodium peroxymonosulfate, potassium peroxymonosulfate, nitric acid, sodium nitrate, potassium nitrate, ammonium nitrate, phosphoric acid, phosphates, ferric nitrate, ferric sulfate, ferric citrate, and mixtures thereof, in all amount of 0.1-20% by weight, if present, based on the weight of the conversion coating composition, and wherein the stabilizer comprises a chelating agent selected from the group consisting of (i) nitrilotriacetic acid (NTA), (ii) EDTA, (iii) DPTA, and (iv) metal salts of NTA, EDTA and DPTA, in an amount of 0.1-20 g/l based on the volume of the conversion coating composition.