Process for electrocoating aluminum articles

Abstract

Abstract IN A PROCESS FOR ELECTRODEPOSITION-COATING AN ALUMINUM ARTICLE WHICH COMPRISES SUBJECTING THE ALUMINUM ARTICLES TO ANODIC OXIDATION TREATMENT, DIPPING THE ANODIZED ALUMINUM ARTICLES IN AN AQUEOUS EMULSION OR SOLUTION OF A THERMOSETTING RESIN COMPOSITION, APPLYING A DIRECT CURRENT TO THE ALUMINUM ARTICLE TO ELECTRODEPOSIT THEREON THE RESIN CONTAINED IN SAID AQUEOUS EMULSION OR SOLUTION, AND THEN HEAT-CURING THE RESIN COATING ELECTRODEPOSITED ON THE ALUMINUM ARTICLE, AN IMPROVEMENT CHARACTERIZED IN THAT ONTO THE SURFACE OF THE ANODIZED ALUMINUM ARTICLE IS APPLIED, PRIOR TO THE ELECTRODEPOSITION, AN AQUEOUS SOLUTION, AQUEOUS DISPERSION OR ORGANIC SOLVENT SOLUTION OF AN ORGANO-SILICON COMPOUND REPRESENTED BY THE GENERAL FORMULA, (R$CH2$N$M-SI-X4-M WHEREIN M IS AN INTEGER OF 1 TO 3; N IS 0 OR AN INTEGER OF 1 TO 3; R, IN THE CASE WHERE N IS 0, IS A LOWER ALKENYL GROUP, AND R, IN THE CASE WHERE N IS AN INTEGER OF 1 TO 3, IS AN AMINO GROUP, AN ALKYLENEDIAMINO GROUP, A LOWER ALKANOLAMINO GROUP, AN A,B-UNSATURATED LOWER ALIPHATIC CARBOXYLIC ACID RESIDUE, OR AN ALKOXY OR CYCLOALKYL GROUP HAVING AN EPOXY GROUP; AND X IS AT LEAST ONE GROUP SELECTED FROM THE GROUP CONSISTING OF A LOWER ALKOXY GROUP, A LOWER ALKOXYALKOXY GROUP, A SATURATED LOWER ALIPHATIC CARBOXYLIC ACID RESIDUE, A HYDROXYL GROUP AND A LOWER ALKYL GROUP, EXCLUDING THE CASE WHERE ALL THE GROUPS REPRESENTED BY X ARE LOWER ALKYL GROUPS AT THE SAME TIME WHEN SUCH TREATMENT WITH THE ORGANO-SILICON COMPOUND IS ADOPTED, THE ADHESION OF THE RESIN COATING AND THE CORROSION RESISTANCE OF THE ALUMINUM ARTICLE IS ENHANCED.

Inventors

• 👤 Y Hasegawa
• 👤 H Sekiya
• 👤 S Terai
• 👤 T Suzuki
• 👤 H Matuo
• 👤 S Kimata

Bibliographic Details