Hobbyists & Industry luminaries alike learn on every visit
(we earn from 'affiliate link' purchases)

Curated with aloha by
Ted Mooney, P.E. RET

finishing.com -- The Home Page of the Finishing Industry

  The authoritative public forum
  for Metal Finishing 1989-2025

-----

Black spots on zinc plating during salt spray test

December 28, 2011

Q. During salt spray test of 5%NaCl solution, I observe black spots after 12 hrs,
is it start of corrosion?
how can I reduce it?
is it serious?
chemical composition of plating material is Sodium cyanide, zinc cyanide and sodium hydroxide.
base metal is MS.
I need your guidance in this regard.

Engr. Muhammad Yousuf Malik
- Lahore, Pakistan

(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: