When using nickel plating brighteners, what harm does nitrate cause to the bath and layer?
Nitrate in nickel plating solution is very harmful, nitrate on the cathode reduction produces nitrogen dioxide gas, reduce cathode current efficiency, near the cathode region of alkaline enhancement, the formation of metal hydroxide, and even exclude nickel ions in the deposition of the cathode, which is why we do Hull tank test, see the test piece of the low-current-density area of the plating layer-free, high-current-density black stripes (which is that shows that there is nitrate in the plating solution). The black streaks appear at high current density (i.e. indicating the presence of nitrate in the plating solution).
The amount of metal hydroxide in the cathode region increases with nitrate ion concentration and current density. As a result, sponge-like precipitates can form or crack the plating even at low pH values, and the plating in general also shows bright bands or darkening, slower deposition, and increased porosity of the plating.
In the use of nickel plating brightener production, the plating solution if a small amount of nitrate, will make the low-current density area plating can not be plated on the layer; slightly more nitrate (more than 0.2g / L) to make the plating luster is poor, the parts of the high-current density area burnt, skinned and black stripes, cathode current efficiency is significantly reduced, unlike hexavalent chromium in the high-current density area is not burnt and brittle, the low-current density area is the same as the leakage of the plating phenomenon; more nitrate to make the whole cathode surface can not be plated The phenomenon; more nitrate makes the whole cathode surface can not be plated. If you want to know how to remove the nitrate, you can consult Bigely technical engineers.
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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 additives. As a famous electroplating additives source manufacturer 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.
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