finishing.com logo
  HOMEFAQsBOOKSHelpWantedAdvertiseContactFORUM Letter 1897

The finishing.com Hotline -- Serious Education ... plus the most fun you can have in metal finishing

How to depassivate?

--

Hello,

I want to depassivate nickel plated accessories, I need to do this to change the color of the accessories, The goods are nickel plated and I replate them gold or Black nickel.

The accessories are passivated some of them over the time, and some of them with solutions.

If anyone can give information how to do this or, has another suggestions, I'll be thankful.

I hope my words satisfy your comprehension.

Thank you in advance

joe tarnouz



--

Proprietary nickel activators are available from several of the suppliers listed in our Chemicals Directory, but a generic Wood's Nickel Strike is fine a lot of the time.

Ted Mooney, finishing.com   Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey

 


--

Very high nickel parts that have been baked at high temperatures are very hard to activate. Sulfuric acid with anodic/cathodic treatment is one standard. Sulfuric / htdrofluoric acid mixture with very little anodic current also might work. Mixtures of nitric and hydrofluoric works well for a dip only process. Ammonium bi fluoride is a much safer source of the fluoride ion. Nitric and hydrochloric acid mixtures will also work, but may have more of a tendancy to pit.

James Watts
- Navarre, Florida

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It is 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; 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. & DevicesUsed & Surplus


©1995-2015 finishing.com     -    Privacy    -    Search