Method for the currentless catalytic precipitation of aluminum

US4144360A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Siegfried Birkle · Höchstadt an der Aisch, DE
• Richard Dotzer · Nuremberg, DE
• Eva Rissel · Forchheim, DE

Key dates

• Filing date: Aug 1, 1977
• Grant date: Mar 13, 1979
• Expiry date: Aug 1, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C18/52
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The invention relates to a method for the currentless catalytic precipitation of aluminum. The surface of insulating and conductive materials (substrates) to be aluminized is (1) catalyzed, while a film-forming moisture-insensitive layer is developed, with a compound active at the boundary surfaces, by a brief immersion in a dilute solution of (a) a modified ester or acylate of titanium, zirconium or vanadium, substituted at the metal atom with short- and long-chain organic radicals or (b), a chloride of the transition metals of the IV and V secondary group of the periodic system of the elements and a water-containing metal soap of a polyvalent metal, preferably aluminum soaps; (2) is intensively rinsed with aprotic solvents, preferably having a boiling point of over 100.degree. C.; and (3) is immersed in a 1 to 4% solution of trialkylaminalanes in a solvent mixture of aromatic and highly viscous aliphatic compounds. A homogeneous and strongly adhering aluminum coating is thereby obtained. Insulating and conductive materials and components, e.g., electronic components and reflectors can in this manner be homogeneously coated with strongly adherent aluminum.