Authoritative Answers, Fun, & Aloha -- no cost, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Adver-
tise
Help
Wanted
Current
Q&A's
Site 🔍
Search
pub     mobile?
Metal finishing Q&As since 1989

-----

Blackening Hot Dip Gal/Bright Zinc Parts

Q. Howdy,

I have a project coming up where I need to blacken/darken a large range of zinc-coated parts - I can either have them in hot dip gal, or bright zinc. Parts themselves are steel. They don't need to be particularly corrosion resistant or uniform, but all need to be black as it's part of a large exhibition piece. Paint isn't an option.

Previously I have removed zinc coatings with muriatic acid, then heated in a kiln + quenched in oil. I tried it without the muriatic acid step and it turned out garbage. It's worked fine, but for this job there's probably about 100 fasteners, around 50 large brackets and numerous other small parts, so it would be incredibly time/labour consuming.

Is there a chemical bath or easier process that would work? I've asked a local blacksmith, and he said the oil quench process was the only one he knew of. If it's anything that's less toxic that would be a great benefit.

Thanks

D Spriggs
- Brisbane QLD
June 25, 2024


Black Patina for Zinc/Pewter/Camé
black_patina_for_zinc
on eBay or

Amazon

(affil links)

A. Hi D.,
Ideal would be to just order the parts zinc or zinc-iron plated and black chromated if they're not already on hand. Blackening them later is not as easy and reliable. If you have the luxury of ordering what you want, black nickel plating and hot or cold black oxiding are other alternatives.

You may be able to blacken zinc plated or galvanized parts with mundane zinc blackening solution.

This question has been asked & answered a few times over the years; please see:

Luck & Regards,

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


thumbs up sign Thanks - have read these and dozens of similar posts, and there has always been suggestions that things 'should' work but never any real confirmation that anybody had actually done it.

Unfortunately I can't order any of the parts in black chromate or this would make my life much easier.

Cheers

D Spriggs [returning]
- Brisbane QLD
June 27, 2024




(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:

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


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