Determination of Sandoz Black Aluminum Coloring Dye, Olive Aluminum Coloring Dye,and Sodium Dichromate Aluminum Sealing Solutions by Uv-Visible Spectrophotometry

摘要

The chemical literature lacks an acceptable method to determine and adequatelycontrol Sandoz black aluminum coloring dye, olive aluminum coloring dye, and sodium dichromate aluminum sealing solutions in aluminum finishing processes. Specific methods are presented here that provide acceptable finishing processes. The optimum operating range of the Sandoz black aluminum coloring dye solution is 12.5 g/l maximum with resulting precisions in the 0.5 to 0.9-g/l range. The optimum operating range of the Sandoz olive aluminum coloring dye solution is 4.5 g/l maximum with resulting precisions in the 0.2 to 0.4-g/l range. The optimum operating range of the Sandoz sodium dichromate aluminum sealing solution is 50.0 g/l maximum with resulting precisions in the 1.5 to 2.0-g/l range. These methods provided adequate control of the three processes supported by six years of testing. Sandoz Black Aluminum Coloring Dye, Sandoz Olive Aluminum Coloring Dye, Sandoz Sodium Dichromate Aluminum Sealants, Aluminum Finishing Solutions, UV-Visible Spectrophotometry.