我厂在电性能接触点上,使用金钴合金,其钴含量在0.35～0.5%范围内。为了严格控制生产工艺过程,需进行定量化学分析。我们选用5%草酸溶液作为三价金离子的还原剂,溶液pH值控制在1～1.5范围内,可将金离子全部还原完全,然后用亚硝基R-盐测钴,可达到较满意的结果。一试剂亚硝基-R盐溶液:0.2%,精称试剂0.5000克加入少量水温热溶解,待全溶后,用去离子水稀释在250 I plant the electrical performance of the contact point, the use of gold and cobalt alloy, the cobalt content of 0.35 to 0.5% range. In order to strictly control the production process, the need for quantitative chemical analysis. We choose 5% oxalic acid solution as the reducing agent of trivalent gold ions, the solution pH value is controlled within the range of 1 ~ 1.5, all the gold ions can be completely reduced, and then use cobalt nitroso R-salt to achieve more satisfactory result. A reagent nitroso-R salt solution: 0.2%, well-known reagent 0.5000 g dissolved in a small amount of water temperature to be dissolved, diluted with deionized water at 250