Rhodium liquid manufacturing method

Abstract

The invention provides a rhodium liquid manufacturing method. The method includes: adding rhodium powder and analytically-pure potassium hydrogen sulfate into a crucible, well mixing, uniformly covering with analytically-pure potassium hydrogen sulfate, putting the crucible in a muffle furnace, cooling, transferring mixed liquid into a beaker to dissolve by heating, filtering in a hermetic filterconical beaker through qualitative filter paper for a circulating multi-purpose vacuum pump, adding analytically-pure sodium hydroxide, standing to realize complete precipitation, and after water is clear and colorless, removing clear water in the beaker while keeping yellow solution; continuously and repeatedly filtering the kept solution by fine qualitative filter paper, transferring into another beaker, adding an appropriate amount of analytically-pure sulfuric acid, well stirring, adding an appropriate amount of ionized water, and heating while stirring until the solution is transparentlybrown. In normal use of rhodium liquid prepared according to the method, coating brightness is in a range of + / -0.5 stably, and formulation simplicity, easiness in operation, high utilization rate andcost reduction are realized.

Description

technical field [0001] The invention relates to the field of electroplating, in particular to a preparation method of rhodium solution. Background technique [0002] With the rapid development of my country's economy and the continuous improvement of people's living standards, my country's jewelry industry has achieved rapid development. Wherein the silver jewelry has been widely liked by people, but there is a phenomenon of blackening of the silver jewelry in case of sulfur so as to affect various aspects of performance. Therefore, the research and development of rhodium-plated materials for jewelry is of great significance for ensuring the safety of the people and promoting the status of my country's jewelry industry in international competition. [0003] In the jewelry industry, white gold alloy and silver alloy are currently the most used precious metal materials for jewelry. The ratio of gold alloy to pure gold has high hardness and low price. It is widely used in hig...

AI Technical Summary

Problems solved by technology

The ratio of gold alloy to pure gold has high hardness and low price. It is widely used in high-end handicrafts and jewelry. However, white gold alloy has the problem that the nickel release rate is too high to cause human allergies, and reducing the nickel content in the alloy will cause the color of the alloy to turn gray.

However, silver alloys have the problem of sulfidation and blackening

Anti-tarnish silver alloy is currently being studied, but the effect is not yet obvious

In addition, silver and gold alloy products are prone to weld scars and uneven color during processing and welding