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The Solution To The Rough And Not Meticulous Silver Electroplating
Jun 06, 2017

If the other ingredients are normal, and is very old Silver Electroplating liquid, it may be carbonate accumulation too much, in general, carbonate is not a problem, so do not easily think that the coarse is too much carbonate, only in a variety of methods can not handle the rough defects, but also found in the cooling conditions of the bath in the deposition or the trough edge of white sediments (carbonate), it is necessary to deal with carbonate. Processing method:

(1) If in the winter, can let the bath natural cooling, at 10 °c below, will too much carbonate crystallization and plating liquid separation can. After the bath is extracted, the crystallization of the groove edge and the bottom of the bath can be dumped into the cyanide waste water tank.

(2) By chemical precipitation method, with calcium hydroxide 0.5g removal of the proportion of LG carbonate, calcium hydroxide is best to add fresh, the effect is better. Fresh calcium hydroxide can be used to adjust the water of calcium oxide into paste, add the amount of people do not have to be strict, excess calcium oxide will not be harmful to the solution.

Silver Electroplating household utensils, tableware and a variety of crafts through the silver plated to achieve decorative purposes; The searchlight and other reflectors in the metal reflector also need silver plating. Silver atoms tend to diffuse and slip along the surface of the material, causing the "silver whisker" to short-circuit in the humid atmosphere. Therefore, silver plating is not suitable for PCB plating. Silver Electroplating encountered in the atmosphere of sulphur dioxide, hydrogen sulfide, halide, the silvery layer of the surface quickly generated silver chloride, silver sulfide, silver sulfate, etc., so that its luster disappeared, and gradually become pale yellow a blue purple a black brown. The solderability and conductivity of the coating are worse. Anti-silver layer discoloration methods are: Chemical passivation, electrolytic passivation, coating organic protective film, electroplating other precious metals and so on.

The widely used electrolytic Silver plating solution is basically more than 100 years ago the cyanide silver electroplating containing excess free cyanide. A wide range of cyanide-free solutions have been reported, such as nitrates, iodide, thiourea, thiocyanate, Amino sulfonate, thiosulfate, sulfonate, and so on, but no one has been recognized by industry. The cyanide Silver plating solution consists of potassium cyanide and free potassium cyanide. To obtain a bright coating, the appropriate brightener can be added. The plating bath has the ability of plating and deep plating, the plating is fine, the appearance is silvery white, the current efficiency is nearly 100%. When the steel, copper and its 8,831 Jyin oath J silver pieces enter the bath, Silver Electroplating on the surface will form the replacement of the silver layer, it not only affects the adhesion of the coating and the substrate, iron and copper ions will also pollute the bath, so the plating before entering the Silver Electroplating trough, must carry out special pretreatment. The common method is amalgam, dip silver, pre-silver plating.