-- The Home Page of the Finishing Industry

on this site
current topics
Live! From beautiful Pine Beach New Jersey: Welcome to the world's most popular metal finishing website

topic 18116

Stainless steel water markers won't stay polished


I am an architect working on a new water intake structure in a highly visible area of the Sacramento River. We've embedded multiple type 316 stainless steel water markers flush to the concrete structure. We've ground them to a fairly reflective polish twice now, only to have them (oxidize?) turn gray as concrete almost uniformly after a rain.

Is there a way to keep this stainless steel reflective w/o constant polishing? Are we using the wrong sandpaper? Is there a chemical to both remove the gray film and maintain the polish?

Thank you,

Jason Ellis, Senior Designer
- Sacramento, California, USA


As long as you keep grinding, the parts will keep corroding. What you need to do, is have the parts passivated to produce a finish that will be resistant to the water. Passivating will leave an oxide-rich layer that is more resistant to the attack of the water than the iron-rich surface that is created by grinding. You may also look at electropolishing to accomplish this.

Dan Brewer
chemical process supplier - Gurnee, Illinois

If you have a question in mind which seems off topic, please Search the Site

ADD a Q, A, or Comment on THIS topic START an UNRELATED topicView CURRENT HOT TOPICS

Disclaimer: It's not possible to 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 may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2019, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.