SU627186A1 - Silver plating electrolyte - Google Patents

Description

Separately, equivalent amounts of silver nitrate and sodium iodide are dissolved. The solutions are mixed, and the precipitated yoa precipitate is decanted several times in doi, and then dissolved in a concentrated solution of sodium jois. Polyvinyl alcohol is dissolved in an electrolyte heated to 6O-7 ° C, an acid is added and, after cooling the electrolyte, sodium thiosulfate. The electrolyte obtained is diluted with water to a volume of 1 dvtr. The rate of silver deposition in a given electroagte depends only on p | The current ratio, since the cathode output current is close to 10O% {97- © 9.0%. Dissipative.) Electrolyte capacity, simulated by the method of Garing and Blum and calculated using the formula Hit e, is 93–08%. Splendid silver coatings without electric power transmission are produced by acceleration of the electrical system, while electrolyte from the electrolyte without acid disappears after passing 1E – 2 A. electrical energy. The current density, the right of which is obtained as a quality index, depends on the silver concentration in the electrolyte talg 1FI silver silver concentration 20 g / l 6 the optimum current density is 0.4-0.5 A / dm, at a concentration of 6O g / l - 1.0 A / dm, at a xycentre of 80 g / l - 1.7 A / dm, Optimal current flow also depends on the type of acid introduced, for example, with the introduction of malonic acid, brilliant flux is obtained at current density 0, 3 A / dm, citric acid - 0.3-1.2 A / dm, boric acid (5.4-1.7 A / dm. The electrolyte is stable in operation. If the electrolyte is with boric acid for a long time it does not work; then a white cottony precipitate may be precipitated, and the electrolytic acid from the tartaric, acmonic, malonic, "blocky in succinic acids darkens. In this case sodium thiosulfate is added to the electrolyte decolorization. A few examples are presented in 4 and V. The proposed electrolyte improves the specular reflectance of coatings, which contributes to the replacement of silver electrolytes. In addition, getting brilliant -. Coatings directly in the electroplating bath eliminates the polishing operation, thereby excluding the loss of precious metal. Formula & Silverlighting electrolyte containing yoai silver, sodium iodide, polyvinyl alcohol and thiosulphate ntree, characterized in that, in order to increase the reflectivity of the coatings, it contained a substance that was chosen by the margins of the brass, the melter, and the bracelet New, small, airborne boric to the rallies of the corresponding components, g / l: silver 20-8O Sodium iodide 440-v5O 627186 bn Nt fe 8 Polyvinyl alcohol 0,2,3-3 Thiosulfate sodium 0, 3 8-8 Substance selected from group in Luciano adipic, tartaric, glutaric, citric, maleic, malonic, malic, and boric kisloty1-10. Sources of information (api, note in the examination: 1. The copyright certificate 312802, class C 25 D 3/46, 1968. 2. The copyright certificate 442231. class C 25 D 3/46, 1972.