How to improve the deep plating capacity of electroplating nickel has been a problem plaguing many electroplating factories, and we will take stock of relevant measures in this article.
The deep plating ability of the plating solution, also known as the covering ability, refers to whether the coating can obtain a complete coating on parts with irregular shapes or deep holes and blind holes.
The shape of some workpieces is irregular, when we are electroplating nickel, the power line is easily affected, the distribution of current density is not uniform, and the current density of some holes inside can not reach the current density required for metal deposition, so it can not get a complete coating.
The current density cannot be increased indefinitely either. When the current density of the plating solution is too high, it will cause the plating layer to appear burnt. The deep plating capability of the bath is related to the current distribution, base metal material, organization and surface condition.
To improve the deep-dip capability of a plating solution, it needs to be adjusted around the four factors mentioned above.
Let's talk about the base metal material first, the cleanliness of the hole (good pre-treatment) is a prerequisite to be able to be quickly covered by the plating layer, if the surface of the workpiece has defects, it will inevitably affect the effective deposition of nickel-plated layer, in the daily production, the hole inspection and the existence of the observation of the poor effect, whether it is with the human eye to see or to judge whether the hydrophilic is more difficult. Therefore, we need to increase the frequency of inspection of the workpiece.
Let's talk about brighteners. Nickel plating brightener Ni-301, which can improve the deep plating ability, can be added into the plating solution. It has a good deep plating ability and can deposit a bright white nickel plating layer in the low current density area. And it has good flatness and brightness.