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首页> 美国政府科技报告 >Online Automatic Titration of Chromic Acid in Chromium Plating Solutions and Phosphoric and Sulfuric Acids in Electropolishing Solutions
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Online Automatic Titration of Chromic Acid in Chromium Plating Solutions and Phosphoric and Sulfuric Acids in Electropolishing Solutions

机译：电镀抛光液中铬电镀液和磷酸和硫酸中铬酸的在线自动滴定

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摘要

Two increasingly important issues for the metal finishing industry are product quality and productivity. This industry is constantly looking for better online methods to monitor key chemical components in its metal finishing solutions. The analytical chemistry literature lacks an adequate online automatic titration method for the monitoring of chromic acid in chromium plating solutions and the monitoring of phosphoric and sulfuric acids in electropolishing solutions. Online automatic titration methods for each of these applications are given here based on previous manual titration methods. The identical experiment was conducted at two different companies who sell this type of instrument and included calibration, standardization and analysis. Although this work has a specific objective related to chromium plating and electropolishing solutions, the general method is applicable to most other types of metal finishing solution titrations. The optimum operating range of chromic acid in these chromium plating solutions is 240- 260 g/l while the optimum respective operating ranges of phosphoric and sulfuric acids are 640-730 g/l and 795 - 895 g/l. The resulting online automatic titration precisions for each application equal the present manual titration precisions from which these methods were derived.

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