Surface pretreatment for sol coating of metals

Details Surface pretreatment for sol coating of metals Surface pretreatment for sol coating of metals

1996-11-04

1999-02-09

Kunemund, Robert

Coating processes

With pretreatment of the base

Etching, swelling, or dissolving out part of the base

427386, 427387, 4274178, B23B 110

Patent

active

058691413

ABSTRACT:
A surface treatment, especially for titanium and aluminum alloys, forms a sol-gel film covalently bonded on the metal surface to produce strong, durable adhesive bonds between the metal and an organic adhesive without using toxic chemicals and while significantly reducing or eliminating rinse water requirements of traditional anodizing or etching processes. An aqueous sol containing an zirconium and an organosilane with an organic acid catalyst and alkoxyzirconium stabilizer is applied to etched or grit blasted substrates by dipping, spraying, or drenching, to produce bonds in a single application comparable in strength and performance to standard anodize controls. Parameters affecting performance include the sol composition, the Si/Zr ratio, the ratio of sol ingredients, the concentration of the sol, the carrier solvent, solution age, catalysts, surface pretreatment, application method, curing process, and primer used.

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