Device for automatically measuring surface chromium content on tin plate by using electrolytic process and determination terminal point judgment method

Abstract

The invention discloses a device for automatically measuring the surface chromium content on a tin plate by using an electrolytic process and a determination terminal point judgment method, and belongs to the field of analysis. The device comprises a computer, a digital controller, double paths of constant current sources, a dual-sided electrolytic cell, a sample sealing mechanism and a charging system, wherein an I / O port of the computer is connected with the control ends of the digital controller and the double paths of constant current sources; the output end of the digital controller is respectively connected with the control ends of the sample sealing mechanism and the charging system correspondingly; the output ends of the double paths of constant current sources are respectively connected with electrodes in the dual-sided electrolytic cell correspondingly; and the charging system is respectively connected with electrolyte pipelines of the dual-sided electrolytic cell correspondingly. The invention also provides a terminal point judgment method of the electrolytic process by using the automatic measurement device for measuring the surface chromium content. A dual-electrolytic cell structure is adopted, so that full-automatic determination on the front side and the back side of the sample is achieved, the measurement accuracy of the surface chromium content on the tin plate by using the electrolytic process is improved, and the device and the method can be widely applied to the field of detection of surface chromium content of the tin plate product.

Description

technical field [0001] The invention belongs to the field of testing or analyzing materials by electrochemical methods, and in particular relates to a measuring device and a measuring method for the amount of chromium on the surface of an electroplated tin product. Background technique [0002] Electroplated tin products usually need passivation treatment to improve their corrosion resistance; the difference in passivation method and passivation amount directly affects the corrosion resistance, sulfur resistance and paintability of tinplate, so fast and accurate Determination of the chromium content on the surface of the passivated tinplate (abbreviated as the chromium content in the industry, the same below) is of great significance for improving the process control level and ensuring product quality. [0003] Existing methods for measuring the amount of chromium on the surface of tinplate include chemical methods (such as spectrophotometry, atomic absorption method, plasma...

AI Technical Summary

Problems solved by technology

Due to the difference in the production process and the storage environment of the tinplate, the measurement results of the two endpoint judgment methods, the 200mv incremental method and the straight-line starting point method, will be quite different, which will prevent the user from using the most suitable endpoint judgment. method for reliable measurement results

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