Method for measuring zinc and nickel contents in zinc-nickel alloy electroplating solution

Abstract

The invention relates to a method for measuring zinc and nickel contents in a zinc-nickel alloy electroplating solution and belongs to the technical field of methods for analyzing the electroplating solution. The method is mainly and technically characterized by comprising the following steps of: reacting dimethylglyoxime and Ni4+ to form a red soluble complex in the presence of an oxidant ammonium persulfate, adding sodium tartrate to eliminate iron and other impurity interference, and measuring the content of nickel in the zinc-nickel alloy electroplating solution by employing a colorimetric method; adding tartaric acid to mask iron and other impurities, with CuY-PAN as an indicator, titrating in an acetic acid-sodium acetate buffer solution with the PH being 5.5 by using an ethylene diamine tetraacetic acid (EDTA) standard titration solution by utilizing a replacement titration principle, calculating the total contents of zinc and nickel in the zinc-nickel alloy electroplating solution, and subtracting the nickel content from the total contents of zinc and nickel to solve the zinc content in the zinc-nickel alloy electroplating solution. The measurement method has the characteristics of simpleness in detection, convenient, rapid and environment-friendly detection process, low cost, accurate and consistent detection result and the like.

Description

technical field [0001] The invention relates to a method for measuring the content of zinc and nickel in a zinc-nickel alloy electroplating solution, belonging to the technical field of electroplating solution analysis methods, and is particularly suitable for measuring the contents of zinc and nickel in an alkaline zincate zinc-nickel alloy electroplating solution. Background technique [0002] Zinc-nickel alloys have excellent mechanical properties, excellent corrosion resistance and brazing properties. The types of zinc-nickel alloy electroplating solutions mainly include chloride type, sulfate type and alkaline zincate type. The plating solution has strong dispersion ability, good coverage ability and high current efficiency. The zinc-nickel alloy coating has strong corrosion resistance, small coating stress and is bright and dry. It can be used as a substitute for cadmium coating and has been widely used in the production of military and civilian products since the 1980...

AI Technical Summary

Problems solved by technology

But among the above two methods, the first method needs to use the highly toxic reagent potassium cyanide, which will cause serious impact on human health and the environment; the second method uses ammonium violate as indicator, and the solution The color change of the end point is not sensitive, resulting in large errors in the measurement results

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