FOERFARANDE FOER ELEKTROFAERGNING AV ALUMINIUM ELLER EN LEGERING DAERAV

摘要

Aluminum or an alloy thereof is electrocolored in a yellow to orange color by first subjecting previously anodized aluminum or alloy thereof to a pre-treatment in a highly concentrated phosphoric acid (H3PO4) bath while passing an alternating current therethrough. The aluminum or alloy thereof is then colored in an electrolytic bath comprising SeO2 or an alkaline selenite by passing therethrough an alternating current at 8-20 volts.