No passwords, No popups, No cost, No AI:
we earn from 'affiliate link' purchases, making the site possible

Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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

  The authoritative public forum
  for Metal Finishing since 1989

-----

What is the cause of White Patches in the plating

September 14, 2008

Dear All

I am working in one of the Automotive industry as a quality Engineer. I am facing a Problem of white patches in nickel chrome plating yellow passivation as well as chrome free plating blue passivation can you give some inputs to over come this problem.
Parts are CEW and ERW. and tell can we do Shot Blasting.

Kiran Kumar
viewer - Hosur, Tamilnadu, India

Hi, Kiran. Your posting is not making sense to me. One does not apply either yellow passivation or chrome-free passivation to nickel-chrome plated parts. Perhaps the parts are zinc plated, or zinc-nickel plated or something? Please try to sort out exactly what processes you are speaking of. What do you want to shot blast, and when, and why? If you are asking whether you can sand blast white patches off of chromate conversion coated parts, no. You can (maybe and to some extent) buff white patches off of nickel-chrome plated parts.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
September 14, 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: