Preparation method for cyanide-free 18 k gold jewelries

Abstract

The invention discloses a preparation method for cyanide-free 18 k gold jewelries. The preparation method comprises the steps of plate making, mold pressing, opening and reversing, alloy mold carrying, drilling, loading, degreasing, primary activation, copper bottoming, secondary activation, gloss copper 1 plating, electrolytic degreasing, ternary activation, gold water preparation, molten copperpreparation, 18 k electroforming, gloss copper 2 plating, demolding, tin bismuth copper removal, distressing, mold carrying, embedding, welding, combination, polishing, cooling, deoiling, electrolyticdegreasing, gold plating, pure water washing, drying, quality inspection, character printing, packing and delivery in sequence; and then, the cyanide-free 18 k gold jewelries are obtained. The preparation method is simple in process and easy to operate, obviously improves the jewelry quality, reduces the gold loss, and contains no cyanide-contained poisonous substance in the preparation process to achieve environmental protection and safety; the hardness and the toughness of the 18 k gold jewelries are prominently improved to preferably guarantee the stability of the jewelries in the wearingprocess; and further, electroforming liquid is excellent in stability, dispersibility and deep plating capacity, can be prepared beforehand for future use, and improves the production efficiency.

Description

technical field [0001] The invention relates to a method for preparing cyanide-free 18k gold ornaments, belonging to the field of 18k gold ornaments preparation. Background technique [0002] With the rapid development of modern industry and science and technology, the requirements for the surface properties of materials are getting higher and higher, and the surface treatment technology has also made great progress. Electroplating is one of the most effective methods in surface treatment technology, and its role and development trend have attracted great attention. The single metal coating of electroplating in the past is far from meeting the performance requirements and increasing needs of the metal coating. Alloy coatings composed of different metals can obtain a variety of special surface properties, and there are many types and a wide range of options. Alloy plating is the use of electrochemical methods to co-deposit two or more metals (including non-metals). [0003...

AI Technical Summary

Problems solved by technology

The existing 18K gold has the following problems: the improvement of hardness has entered a bottleneck period, and it is difficult to further improve; the electroforming liquid required for the preparation of existing 18K gold jewelry needs to be prepared on site due to its poor stability, which increases the labor intensity of workers and affects production efficiency; The electroforming solution also has defects such as poor dispersion ability and poor deep plating ability, which will affect the quality of 18K gold jewelry; electroforming often uses toxic substances containing cyanide, which poses a great threat to workers and the environment; due to the defects of the preparation process , leading to problems such as low yield

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