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

Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Adver-
tise
Help
Wanted
Current
Q&A's
Site 🔍
Search
pub  Where the
world gathers for metal finishing
Q&As since 1989



-----

Having trouble heating the flux bath

none
adv.
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q. Currently I'm having trouble heating the flux bath. I am taking advantage of the heat from the zinc tank, but the steam pipe is often punctured when immersed in Flux solution (ZnCl2. NH4CL). Based on your experience, what method should I use to heat the flux to 60-70 °C?

The fluxing solution includes 2 salts ZnCl2 and NH4Cl. Excess hot air pipes from the zinc tunnel will be soaked in fluxing to make this solution up to 60-70 degrees Celsius. After a period of use, these pipes will be corroded by Fluxing and high temperatures from the hot air into the pipes.

The pipes used is the special stainless steel type UNS S31254 ( stainless steel grade 254 SMO) with Mo (molybdenum) content up to 6%

My goal is to heat Fluxing to 60-70 °C, above is how I do it. Can you advise me which option is more effective?

LEO LI
- SHANGHAI&SHANGHAI CITY/ CHINA
February 22, 2024


A. This is a common problem where the hot gas is inside a tube immersed in flux. The flux is very corrosive, especially where the metal of the pipe is at high temperature.
A better system is to use the zinc furnace exhaust gas t make hot water at about 90C, and then use the hot water to heat the flux with immersed pipe heat exchanger, often ptfe tubing exchanger.
If you must use hot gasses direct into tubes immersed in flux, then 316L can perform OK, but will still corrode.

geoff_crowley
Geoff Crowley
Crithwood Ltd.
supporting advertiser
Bathgate, Scotland, UK
crithwood logo


A. Best solution will be use SS316L or SS316LTi pipe to circulate hot water from quenching tank in to flux tank.

Ilesh G Vyas
Gunatit Builders
supporting advertiser
Manjalpur, Vadodara, Gujarat

gunatit builders


thumbs up sign Thanks a lot, I will try!!!

Leo Li [returning]
- Shanghai/Shanghai city
March 1, 2024




(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:

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


About/Contact  -  Privacy Policy  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"