-- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing.
    no popups, no spam
on this site
current topics

topic 490

Black Nickel Deposit


We electrowin Nickel from a Nickel Sulfate solution at a current density of 250-400 Amps/Mt2 and agitation promoted by mechanical stirring. Sometimes we get a black sometimes powdery deposit over the Nickel. It seems to be a Nickel compound because when analyzed by ICP it does not show other metals than Na (from pH control) and Ni. When scrapped off and passed under a magnet it shows to be magnetic. What could it be?

Alfonso Benavides
- Corpus Christi, Texas


Dear Mr. Benevides:

When you electrowin this nickel, no doubt you will be codepositing other components. What you might be seeing is a plain old fashioned "burning" pattern. This would be my best hunch. Elimination could be to lower the current density as the concentration of the nickel in the solution decreases.(Not attractive if you are under time constraints for plate out).

Remember too, that nickel is one of the magnetic metals, although not as magnetic as steel. You may wish to contact your supplier and see if they have a nickel additive that may help as an antiburn agent, to minimize the burning. Sincerely, Ed Budman

ed budman
eb sig
Ed Budman
- Pennsylvania


Thanks Ed I will check it out. Alfonso

Alfonso Benavides
- Corpus Christi, Texas

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Comment to THIS thread START a NEW threadView CURRENT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2018, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.