No registration, no passwords; no pop-up ads -- just aloha, fun, & authoritative answers.
As an eBay Partner & Amazon Affiliate we receive compensation for qualifying purchases.
Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site
pub  Where the world gathers for
plating, anodizing, & finishing Q&As since 1989





-----

Blue spot/growth on a silver plated component

Q. I have a favour to ask, to see if you have ever experienced anything like an unknown blue spot/growth on a silver-plated component. It looks to me like something is getting trapped possibly via capillary action in the joint between the two parts and is then leaching out after the part is plated.

61621-1

61621-2

We have tried washing the components in an attempt to clean this away, but it removes the blue spot at the time of washing, only for it to grow back again after a period of time.

Have you guys encounter the same issue as mine? Is there any solution to solve this issue, to eliminate the blue spot?

Any advice would be very welcome. Thanks.

Amin Mohamad
- Johor, Malaysia.
December 13, 2023


61621-3

A. Hi Amin. Most silver plating is cyanide-based, and cyanide bleed-out is a problem well known to platers, so you could search the site for "cyanide bleed out" to make sure you are avoiding it as much as practical.

However, according to digikey.com, blue staining of silver plating is a harmless and unavoidable silver sulphide / silver oxide ⇨

Luck & Regards,

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


A. From my opinion, this blue spot as long as there is "a gap" in the riveting, the blue spot would definitely occur over time once plating is done as chemical gets in or penetrates into the product. This blue spot takes time to occur depending how much chemical penetrated into the gap.

hairul / ismail / hairullizam
- Malaysia-Nusajaya
January 15, 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:

 
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"