No passwords, No popups, No cost, No AI
we earn from your eBay & Amazon purchases

Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Adver-
tise
Help
Wanted
Current
Q&A's
Site 🔍
Search
curated with aloha by
ted_yosem
Ted Mooney, P.E. RET
- Pine Beach, NJ
finishing.com -- The Home Page of the Finishing Industry


  pub
  The authoritative public forum
  for Metal Finishing since 1989

-----

How to Differentiate Two parts Having Dacromet and Geomet Coating?




If one bolt is having Dacromet coating and another one is having Geomet coating and both are having same silver colour then how to differentiate Dacromet coated bolt from Geomet coated bolt.

Prashant Jadhav
employee - India
October 3, 2008



One approach would be to contact Metal Coatings International. Dacromet is based on the reaction of hexavalent chromium with monomers and zinc and aluminum flake. It will therefore test positive for hex chrome using the GMW 3034 or ISO 3613 test. (I wouldn't rely on spot tests.) Geomet is based on organosilane technology and will test negative for hex chrome. Or you could ask your supplier to tell you what they are putting on the parts in the way of a certification.

tom_rochester
Tom Rochester
CTO - Jackson, Michigan, USA
Plating Systems & Technologies, Inc.
supporting advertiser
plating systems & technologies banner ad
October 8, 2008



You can put a couple of drops of NH4OH on the bolt, wait 30 seconds. If the part is Dacromet the NH4OH should turn yellow. Now the caution is if the coating is not cured properly this may not work. The most sure way would be to run an X-ray to get the elemental analysis and look for chromium.

David J. Wolf
David J. Wolf
Medina, Ohio
October 21, 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:

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"