Maintenance method of cyanide free copper plating

With the development of science and technology, the surface treatment solution is constantly updated. The cyanide free copper plating additive of Renchang technology, that is, the cyanide free alkali copper solution, has been used in the market for many years. However, the customers who just completed the transaction are not very familiar with the use and maintenance. Here, I would like to popularize the maintenance method of cyanide free copper plating:

The cyanide free copper plating solution is composed of three agents a, B and C. It is also added proportionally during maintenance and use.

200A electroplating concentrate provides copper for the base substrate. During electroplating, the deposited copper is supplemented by anodic erosion. The complex medicine carried out is supplemented by the addition of 200B. Generally, 200A can be added only when the new bath or plating solution function is exhausted. The copper content in the plating solution is generally maintained at 8-10g / L for hanging plating and 6-8g / L for barrel plating. In the production process, due to the loss of the plating solution and the loss of the electrode process, it can be supplemented according to the chemical analysis. For every LG / L of copper, 200a44ml / l can be supplemented. （A400，B100）

200B make-up solution contains complex agents. Its addition can be used as the supplement brought out and the amount consumed due to electrochemical action. If it is too small, it will cause the decrease of binding force. If it is too small, it will not cause any adverse effect. The 200B make-up solution contains strong acidic substances, so it should be added carefully, and 200C adjusting agent (3-4): 1 should be used before adding. The consumption of 200B is about 150 ~ 200ml / Kah, which can also be added according to Hall cell test.

The pH value of the plating solution should be controlled at 9.0-10, not lower than 9, so as not to affect the binding force of the coating. Potassium carbonate is used to increase the pH value and 200B is used to decrease the pH value.

The anode material shall be rolled high-purity copper plate. In order to prevent the anode mud and copper powder from polluting the plating solution, nylon sleeve shall be used and the plating solution shall be continuously filtered.

It is required to strictly prevent CN - and metal ions such as iron, copper, nickel and chromium from polluting the bath liquid, resulting in poor coating appearance, foggy, rough crystal, dark red color and other defects.

The above is the maintenance method of cyanide free alkaline copper plating. Please use it in strict accordance with the specified parameters during use to avoid irreparable losses.

Source: cyanide free alkali copperhttp://www.newstar-china.com