No registration or passwords; no pop-up ads -- just aloha, fun, & answers.
(as an eBay Partner & Amazon Affiliate earns from qualifying purchases).
Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Advertise
 
Help
Wanted
Current
Q&A's
Site 🔍
Search
pub  Where the
world gathers for metal finishing
Q&As since 1989



-----

Alternate solution to Zinc Plating for threaded parts produced to dimensions that don't allow plating




Our Supplier supplied the part to final dimensions without plating Threaded Nut which calls for Zinc Plating Fe/Zn8c2C. Now if the plating is done, then it may affect the final dimensions and the part may not be able to assemble. What can be alternate solution to protect the part from corrossion without affecting the final dimension.

Sanjay Kumar
Product Designer - Amman, Jordan
2007



The parts can be black oxided & oiled or phosphated & oiled, Sanjay, but this will not offer the corrosion resistance of zinc plating.

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2007


Maybe you could slightly over etch them (after trial and error on samples) to remove one or two thousands per side all around. Clean the smut and proceed with the zinc plating normally.

Guillermo Marrufo
Monterrey, NL, Mexico
2007



2007

Good afternoon:

If I'm understanding your question, this problem is a bit unusual. I usually associate plating buildup and assembly concerns with long bolts and screws, which can build up a lot of plating thickness in the high current density threaded end. Especially with chloride zinc plating. With nuts, the threads usually don't have much plating on them anyway because that's a low current density area.

Maybe this is a longshot, but can the threads on the mating part be roll threaded or cut very slightly undersized to accommodate the buildup on the nut? Maybe we need more information to assist you.

Steve Bizub
- St Louis, Missouri



February 10, 2008

YOU have to go to two solution
1- you can confirm on the manufacturing of this to left a tolerance in between 25 to 30 micron less because this toulorence equal zinc plating thickness.After complet plating the dimensions come accurate.

2- If you can't to go to the first solution you can make Blackining or phosphating & oiling. because it will left thin layer on the surface without affecting on the dimensions

Yasser Metwalli Osman
Senior: Chemist

Yasser Metwalli Osman
- U.A.E, Ajman



Hello Mr. Kumar,
I agree that your problem is a little strange. Saying nothing of some kind of misunderstanding, I see two possibilities. Zinc deposition is really too thick (maybe too long treatment) or deposition is right, but your screws are very small, for example 2 mm in diameter. In the second case, 8 microns of deposition should be revised.

Janusz LABEDZ
AUROTECH - Warsaw, Poland
February 14, 2008



Sanjay,
Screws,nuts and bolts can be batch e-coated in urethane with a deposition of 4-8 microns without blocking the threads or making them difficult to use. Urethane e-coat offers UV stability and corrosion resistance on any conductive metal.

Mike Dywan
- Phoenix, Arizona
April 1, 2008




(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully 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 might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact  -  Privacy Policy  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"