高硬度弱酸性氰化亚金钾电铸黄金工艺品的研制

Preparation of high-hardness electroformed gold artifact obtained from a weakly acidic gold potassium cyanide electroforming bath

在弱酸性氰化亚金钾电铸溶液中加入少量（0.3-0.6g/L）氰化钴钾,电铸黄金工艺品的硬度达到155-185HV,与传统产品相比增加了100HV。电铸工艺品硬度及黄金成色都采用相关的国际标准测定。实验结果表明,黄金铸件的硬度先随氰化钴钾加入量的增加而提高,当氰化钴钾加入量为0.4g/L时达最大值,而后趋于稳定;Co3＋含量在0.008%-0.03%之间时,黄金产品的成色没有影响;加入钴离子后,产品成品率明显增加到76%-92%。该工艺可以显著提高黄金工艺品的质量与产量,节省黄金原料,具有很高的实用价值。

An electroformed gold artifact was obtained from a weakly acidic gold potassium cyanide electroforming bath with an addition of small quantity （0.3 - 0.6 g/L） of potassium cobalt cyanide. The hardness of the electroformed artifact is up to 155 - 185 HV, an increase of 100 HV compared with that of the traditional products. Both hardness and percentage of gold of the gold electroformed artifact were tested based on the related international standards. The results show that the hardness of the gold artifact increases first with increasing the amount of potassium cobalt cyanide, and then reaches maximum as the addition amount of potassium cobalt cyanide is 0.4 g/L, finally goes to a constant value. The content of Co^3＋ in the gold artifact has no effect on the percentage of gold when it is between 0.008%-0.03%. The rate of end product increases to 76%-92% obviously after adding cobalt ion. The process can improve the quality and yield of gold artifact, and thus can save gold material, having very high practical values.