Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
-----
SS420 Pickling and Passivation Problem
www.finishing.com is made possible by supporting advertisers ...
this text gets replaced with bannerText
this text gets replaced with bannerText
Q. Hello, I have 420 stainless steel drive rollers, which I subject to heat treatment. These return to the process buckled so they must be straightened with heat where they burn and black spots remain. Afterwards we have to brush them mechanically to return their natural color. My question is if there is any chemical solution that allows me to avoid brushing. I tried HNO3 and HF and they blackened even more and the burnt stain did not disappear. I thank you in advance for your advice. Sincerely Juan
Juan Moreno- Santiago de Chile
October 24, 2023
A. Hi Juan,
adv.
Please contact me directly. We tested a few possible chemical solutions for heat treated 420 ss.
Anna Berkovich
Russamer Lab
Pittsburgh, Pennsylvania
October 25, 2023
(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
Q, A, or Comment on THIS thread -or- Start a NEW Thread