초록 ▼

Aluminum-based sheets or parts, such as formed aluminum assemblies contaminated with forming die lubricants, are cleaned by a solventless, thermal degreasing process at controlled temperature (about 300°-400°F.), and in specified atmospheres (reactive gas which is at least at atmospheric pressure) p

Aluminum-based sheets or parts, such as formed aluminum assemblies contaminated with forming die lubricants, are cleaned by a solventless, thermal degreasing process at controlled temperature (about 300°-400°F.), and in specified atmospheres (reactive gas which is at least at atmospheric pressure) prior to brazing. The organic contaminates on the aluminum-based sheet or part are reacted with the reactive gas (air or oxygen) and removed from the surface of the sheet or part without disruption of the underlying protective oxide layer. Subsequent brazing is thereby facilitated.

대표청구항 ▼

A solventless, thermal decreasing process for cleaning an aluminum-based sheet or part to product a more readily brazable aluminum-based part sheet or part, comprising: (a) providing said aluminum-based sheet or part having organic contaminants thereon and in need of cleaning to improve its brazabil

A solventless, thermal decreasing process for cleaning an aluminum-based sheet or part to product a more readily brazable aluminum-based part sheet or part, comprising: (a) providing said aluminum-based sheet or part having organic contaminants thereon and in need of cleaning to improve its brazability, and (b) heating said sheet or part in the presence of a reactive gas at least at atmospheric pressure and at a temperature of between about 300 and 400°C. for about 10 minutes to about 30 minutes to volatize and remove said organic contaminants by reacting said organic contaminants with said reactive gas without significantly disturbing the underlying aluminum oxide layer.