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

-----

White residue on the blued parts

After the bluing (black oxidizing) and assembling of the parts we observe after a while (1 week) there is white residue, mainly on the joint points (screw) of the part.

Do the parts have to be blued as distmantled (as unique part,i.e. not as assembly) ? We're bluing the parts with their screws.

Or is there something wrong with boron oil mixture(with water) that is used to clear part after bluing.

What do you suggest about the water displacing oil ? Do we need to put an additional bath full with hot pure oil following the boron oil bath ?

MEHMET TASYAGAN
- Izmir, TURKEY
2001

The white salts are bleeding out after the oxide process. It is very difficult to completely rinse the chemicals out from processing. Oxide the parts separately, then assemble.

Tom Pullizzi
Falls Township, Pennsylvania
2001

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: