No passwords, no registration, no paywalls, no popups, no AI

As an Amazon Associate & eBay Partner we earn from affil links

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

Search our quarter-million Q&As

Home of the finishing HOTLINE since 1989

-----

Carbon mark defect on piping product after pickling

I have been using HF+nitric for passivate but lately a few problem occur in the process. Those problem are: 1)the appearance of carbon mark 2)the appearance of acid mark those problem have slow down my production rate. I hope sir can recommend me the way to overcome this problem.

Thanks,

Lim Boon Pin
Kanzen-Tetsu - Malaysia

Dear Mr. Pin,

You did not write that you passivate Stainless Steel but I understand that this is the case. You are not obliged to passivate with Hydrofluoric acid , omit the Hydrofluoric and you won't have the problems you described.

Yehuda Blau
YB Plating Engineering and Quality - Haifa Israel

Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.

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: