Patent ID: 6579439
Filing Date: 2003-06-17
Classification: C25F,H01L

Abstract:
A process for electropolishing an aluminum alloy material comprising the steps of:a. providing a polishing solution comprising by weight: i. from about 55% to about 90% of a phosphoric acid solution, wherein the phosphoric acid solution comprises from about 60% to about 100% phosphoric acid; ii. from about 0.2% to about 20% of a hypophosphite-containing compound, wherein components i. and ii. are measured out of a total of 100% polishing solution; b. applying a mechanical force to the polishing solution, thereby providing an agitated polishing solution; c. immersing the aluminum alloy material in the polishing solution for from about 2 minutes to about 60 minutes; and d. making the aluminum alloy material anodic by applying a DC current concurrently with the immersing step; thereby providing an electropolished aluminum alloy material.