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

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

-----

Low temperature limit for zinc plated parts

Q. I have seen a lot of information regarding high temperature limits for zinc plate. What about low limits?
I have a customer that is immersing zinc plated parts in liquid nitrogen pre-installation and they are experiencing the plating peeling. Is this caused by the low temp?

Bob Newkirk
Adept Fasteners Inc. - Valencia, California
May 24, 2018

A. You would have to check the thermal expansion/contraction of the steel and zinc.

George Shahin
Atotech - Rock Hill, South Carolina
June 13, 2018

June 13, 2018

A. Hi Bob
The actual low temperature is unlikely to be the root cause.
Thermal shock is a well known test for plating adhesion and going from room temperature to liquid nitrogen is a pretty extreme shock.
You should look at the pre-treatment of the parts and particularly confirm that they pass a water break test.

Geoff Smith
Hampshire, England

(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: