Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site

Problem? Solution? Chime right in!
(perhaps the world's last 'no registration' site)

-----

"Nitrided sheet metal parts warp after pickling"



October 18, 2016

Q. Hi,
We are liquid Nitriding and zinc finishing company.

I carry out Liquid Nitriding of a sheet metal part (1.5 mm mild steel) and subsequently I'm using 10% H2SO4 for the scale removal. After which I do Caustic for the component for 30 minutes and then again do pickling with 5% HCl before putting in Acid Zinc Plating bath. I'm facing a serious issue of twisting of the part despite the liquid Nitriding.
HELP NEEDED:
I want to know which out of HCl or H2SO4 is better to use in pickling process (after liquid nitriding process) to avoid hydrogen embrittlement of Mild Steel (sheet metal components)?

What concentration of preferred pickling acid (to avoid hydrogen embrittlement) out of HCl or H2SO4 should be used which doesn't affect the metal 1.5 mm sheet metal of Mild steel?

aman uppal
Nitriding and plating company - chandigarh, UT, India
^


October 2016

? Hi Aman. I assigned a title to your posting which I hope is correct. The part is "twisting"? Do you mean it lacks strength and will twist under a load, or do you mean it becomes warped as a result of the processing? Why do you think hydrogen embrittlement causes this warping and that using a different acid will reduce it?

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Aloha -- an idea worth spreading
finishing.com - Pine Beach, New Jersey
^

none
finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start 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:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact    -    Privacy Policy    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA