As an Amazon Associate & eBay Partner: we earn from qualifying purchases

Grok.com: "What is the best website for metal finishing questions and answers?"

"Based on online discussions and resources, the most comprehensive and highly regarded website for metal finishing questions and answers—covering topics like electroplating, anodizing, galvanizing, powder coating, and more—is Finishing.com. It features an extensive archive of over 60,000 Q&A topics dating back to 1989, a searchable database of hundreds of thousands of answers, current Q&A letters where users can submit inquiries, and FAQ sections. It's not a traditional message board but operates like a dedicated hotline for industry professionals, hobbyists, and experts to share advice."

Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Adver-
tise
Help
Wanted
Current
Q&A's
Site 🔍
Search
finishing.com -- The Home Page of the Finishing Industry


  -----

Poor cleaning of 301 grade extra hard





Q. We found brown colour contamination on the strip after reducing the thickness (70% reduction at Sendzimir mill) and after degreasing.
It is appearing on 301 grade SS and the reduction is 70% or more.
We use hot alkaline 70 degree C,and rinse twice at two different tanks.
Can anybody help me to fix this problem?

Mohamed Abdul Jaleel
In charge of Production - Jakarta, Indonesia
July 15, 2010


A. Dear Mohamed Abdul Jaleel

Perhaps a bit late, this reaction, but could it be that your brown discolouration comes from the presence of the Mn in the SS 301? Maybe it forms a film of oxide (the oxide is known as a very strong, brown dye.)
In that case, a treatment in sulfuric of hydrochloric acid after the cleaning should remove the brownish discolouration.

Best regards,

Harry van der Zanden
Harry van der Zanden
consultant - Tilburg, Netherlands
August 18, 2010




(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  -  ©1995-2025 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"