Mr. Rogers: "Look for the Helpers. You will always find people who are helping."
As an Amazon Associate & eBay Partner: we earn from qualifying purchases

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

-----

Black stripe on cleaned and annealed cold rolled coils

Q. GETTING BLACK SURFACE IN COLD ROLLED STRIPS / PROCESS ELECTROLYTIC CLEANING THEN ANNEALING

61342-1

JAGDISH MISHRA
- SAMBALPUR ORISSA INDIA
October 6, 2021

A. Hi Jagdish. We don't have much info upon which to hazard a guess yet, but it looks to me like oil/grease was getting onto that one particular area on the strip, and burning on and blackening up during annealing.

Luck & Regards,

Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
October 2021

(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: