finishing.com -- 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
HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
current topics
topic 1622

cadmium stripping on high strength steels


(1998)

What is a good non-cyanide method for stripping yellow chromated cadmium from high strength steels (>43 HRc)? Sodium hydroxide bleaching and ammonium nitrate stripping leaves behind a white residue.

Mandar Sunthankar
- Fort Collins, Colorado


(1998)

After using ammonium nitrate, remove the residue in 10 % hydrochloric acid ( inhibited with glycerine ) , then clean anodic in alkeline cleaner . Heat treat for 2 -3 hours at 190 c , to remove embrittlement . Bleaching is not required dip parts in the cleaner first .

Problem solved .

Dave Brackenridge
aerospace plating - Germiston, South Africa


(1998)

Dave, what if I do the HCl clean first to dissolve chromate layer, then strip in nitrate? I am not willing to touch HCl to the kind of parts I receive. Also, how much glycerine do I have to add to inhibit HCl?

Mandar Sunthankar
- Fort Collins, Colorado

(1998)

I need to know what causes propeller blade burn when using hot solution while anodizing for cadmium plating.

Ed Davidson
- SCS - Birmingham, Alabama



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 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy
How Google uses data when you visit this site.