Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

Effect of high temperature on citric acid passivate stainless steel

2005

We have an application whereby stainless steel AISI 440C (passivated by citric acid) precision balls has to be moulded into plastic at moulding temperature between 170-250 °C. Will the passivated surface be degraded in this kind of moulding condition ?

Koh Kee Hun
- Singapore

I assume that the 440C has been hardened. What kind of citric acid passivation did you do on it? For this kind of steel the passivation needs to be done correctly.

If the steel was hardened and passivated correctly the molding temperature will not hurt the passivation.

Lee Kremer
Stellar Solutions, Inc.

McHenry, Illinois

2005

(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: