STUDIES ON THE ELECTOROLYTIC AND CHEMICAL POLLISHING OF AL AND AL-ALLOYS

Abstract

The HCl O₄ bath of Jacquet was better than other bath in electoolytic-polishing of Al and Al-alloys.
The results of other bath summarized as follows:
1) High voltage 40-100V
2) Chemical reaction by over-heating of anode
3) It is difficult to obtained the uniform mirror surface
This report is inproved the following points
1) Low voltage 10-20V
2) Uniform a millor surface
3) The new bath of H₃PO₄-K₂Cr₂O₇
Jererally chemical-polishing can not be applied to Al-alloys.
This report proposed H₃PO₄-(COOH)₃ bath for Duralumin, Y-alloy, Lautal, Silumin, Al-Mg and Al-Cu.