Chemical method for efficiently detecting content of rhodium and ruthenium in plating layer

Abstract

A chemical method for efficiently detecting the content of rhodium and ruthenium in a plating layer comprises the following steps: 1, placing an appropriate amount of a sample to be detected in a crucible, adding an appropriate amount of an alkali, and reacting the mixed sample with the alkali at a high temperature until a molten state is reached, wherein a mass ratio of the sample to the alkali is 1:(3-10); 2, adding an acid to a melt obtained in step 1 to achieve neutralization, and adding water to dilute the above obtained solution after the solution is clarified; and 3, detecting the content of rhodium and ruthenium in the diluted solution obtained in step 2 through inductively coupled plasma emission spectrometry or atomic absorption spectrophotometry. The method for detecting the content of rhodium and ruthenium in the plating layer adopts chemical total digestion and accurate spectrum quantification to accurately obtain the content of rhodium and ruthenium, has the advantages ofsimplicity in operation and low cost, successfully solves the problems of inaccurate detection of the element content in the rhodium and ruthenium alloy plating layer and the proportion configurationof a rhodium and ruthenium bathing solution, and saves the electroplating cost and the detection cost.

Description

【Technical field】 [0001] The invention relates to the field of precious metal detection, in particular to a chemical method for efficiently detecting rhodium and ruthenium content in a test coating. 【Background technique】 [0002] Rhodium, ruthenium, platinum and palladium belong to platinum group metal elements, and have been widely used in industry, electronic information, aerospace, military industry and other fields. The use of rhodium-ruthenium alloy plays an increasingly important role in the development of new technologies, and is widely It is listed as a strategic material, but the reserves of rhodium and ruthenium in the earth's crust are scarce, and in application, a thin layer is often plated to reduce costs. [0003] The properties of ruthenium and rhodium are similar, the appearance is slightly darker than rhodium, but the price is much cheaper than rhodium. On the premise of not affecting the bright silver-white appearance and quality of the coating, adding rut...

AI Technical Summary

Problems solved by technology

At present, the industry often uses a film thickness meter to test the coating. The equipment is expensive, and there is a lack of standard sheets of the same substrate, so it is impossible to accurately test the content of rhodium and ruthenium, which brings difficulties in controlling the ratio of rhodium and ruthenium in the coating.

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