Nickel Sulfamate and Pits

Article From: Products Finishing, ,

Posted on: 8/1/2001

Question: We are having problems with pits in our nickel sulfamate plating line.

Question:

We are having problems with pits in our nickel sulfamate plating line. What suggestions do you have to eliminate this problem? R.M.

Answer:

Your e-mail does not give me much to go on, but here are typical causes of pitting in nickel sulfamate plating baths.

Is there enough boric acid dissolved in the bath? Boric acid is not very soluble in a plating bath. Dropping of the bath temperature will cause boric acid to precipitate. It does not dissolve very readily when the plating tank is brought back up to operating temperature.

Is there enough antipitting agent in the bath? If the bath does not contain enough antipitting agent, bubbles tend to "stick" to the plated surface and pits are formed. You should monitor the level of antipitting agent by measuring the surface tension of the bath on a regular basis. The optimum surface tension for an air-agitated plating bath is 30-35 dynes/cm.

Do you have organic impurities in the bath? These usually can be removed by peroxide treatment followed by activated carbon filtration. Your chemical vendor can supply you with information on the proper procedure.

Comments are reviewed by moderators before they appear to ensure they meet Products Finishing’s submission guidelines.
blog comments powered by Disqus


Learn More

Zones

Supplier Categories


Technic Inc
Insoluble Anodes
American Plating Power
Luster-On Products
Pavco

Suppliers | Products | Experts | News | Articles | Calendar | Process Zones

The Voice of the Finishing Industry Since 1936 Copyright © Gardner Business Media, Inc. 2014

Subscribe | Advertise | Contact Us | All Rights Reserved