An electroplating factory in Zhejiang once encountered the following problem: After the 5th battery shell was removed from the tank, it was found that the bonding strength of the rolled nickel coating was poor. It was initially thought that this was caused by excessive addition of the nickel plating brightener. However, after investigation, it was discovered that it was not the case. So, what could be the reason? Let's analyze it.
Take the thin-walled part with deep holes in the 5th type battery shell as an example. During the electroplating process, due to its light weight, if there is no plating solution in the cavity or the plating solution fails to fill it completely, the battery shell will have more buoyancy in the plating solution than its own weight, and thus will float on the liquid surface like a boat.
In this situation, the battery shell that is floating on the liquid surface or partially submerged has disconnected from the conductive rod, thus entering a de-electrified state. Later, when it is turned into the plating solution by other rotating battery shells and re-electrified, the plating layer begins to deposit again. At this point, there will be problems with the adhesion of the plating layer. After being removed from the solution, a certain number of battery shell plating layers will fall off, and the fallen plating layers are very brittle, some even in a fragmented state.
This fault phenomenon is not caused by power failure leading to oxidation of the nickel coating. In most cases, it is caused by bipolar electrodes. Regarding the issue of bipolar electrodes, we have discussed it in the previous article. We will not repeat it here. If the operators lack experience and mistakenly believe that too much nickel brightener has been added during the rolling process, or suspect that there is a problem with the brightener, it will result in even greater losses.
Therefore, as a manufacturer of barrel nickel brightener, Bigely suggests that when loading parts like battery casings into the roll barrel, they must be filled to the brim so that they cannot float freely. That is to say, each battery casing must be in an energized state. When the roll barrel is first lowered into the tank, it is best to temporarily not power it on and let it rotate for a few minutes. Then, after filling each battery casing with the plating solution, turn on the direct current power supply.
About us
Guangdong Bigely Technology Co., Ltd. ,founded in 2003, is a high-tech enterprise integrating R & D，production, sales and service, specializing in the production of electroplating chemicals. As a fast growing electroplating chemicals supplier in China, Bigely has over 20 years' experience in electroplating additives production and own production base of 5000 square meters. We can produce 15,000 tons of electroplating additives every year, which can fully meet the needs of customers.
If you need our high-quality electroplating additives, please contact us. We can provide you samples for test, and also provide a series of services.
