Descreption: household products plastic parts shinny chrome plating
Material: ABS
Plating method: plastic water plating
Plating color: shiny chrome/bright chrome
Composition of chrome plating
⑴The role of each component in the plating solution
1) Chromic Anhydride
The aqueous solution of chromic anhydride is chromic acid, which is the only source of chromium plating. Practice has proved that the concentration of chromic anhydride can vary within a wide range. For example, when the temperature is 45～50℃, the cathode current density is 10A/dm2, and the chromic anhydride concentration is within the range of 50～500g/L, even as high as 800g/L, bright chromium plating can be obtained. But this does not mean that the concentration of chromic anhydride can be changed at will. The concentration of chromic anhydride used in general production is between 150 and 400 g/L. The concentration of chromic anhydride plays a decisive role in the conductivity of the bath. Figures 4-19 show the relationship between the concentration of chromic anhydride and the conductivity of the bath. It can be seen that at each temperature there is a concentration of chromic anhydride corresponding to the highest conductivity; as the temperature of the plating solution increases, the maximum conductivity of the bath will move to a slightly higher direction with the increase of the concentration of chromic anhydride. Therefore, in terms of conductivity alone, it is advisable to use a chromium plating solution with a higher concentration of chromic anhydride.
However, when a high-concentration chromic acid electrolyte is used, due to the serious loss carried out with the workpiece, on the one hand, it causes unnecessary consumption of materials and also causes a certain amount of pollution to the environment. The low-concentration plating solution is more sensitive to impurity metal ions and has poor coverage. chromium
Too high or too low anhydride concentration will narrow the range of temperature and current density for obtaining bright coating. Plating solutions with low chromic anhydride concentration have high current efficiency and are mostly used for hard chromium plating. The thicker plating solution is mainly used for decorative electroplating. Although the performance of the plating solution is related to the content of chromic anhydride, the most important thing depends on the ratio of chromic anhydride and sulfuric acid.
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