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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Best material for Heating & Cooling Coils for Acid Tin Bath?

Q. I am doing Acid tin plating. To cool the solution to room temp can I know what is the coil that can be used for the same?

Mahesh M K
plating shop - Bangalore, Karnataka, India
April 18, 2008

A. Hi Mahesh,

Wot acids, wot temperature ?

You've got many choices ....
TFE (expensive),
PVDF (resistant to all acids but doesn't like high pH),
Stainless (metals are best for heat transfer).

Freeman Newton [deceased]
(It is our sad duty to advise that Freeman passed away
April 21, 2012. R.I.P. old friend).
April 18, 2008

Q. I am using sulfuric acid tin bath (conc. 10 % ) along with stannous sulfate and additives for bright finish plating.

Can we coat the titanium tubes with teflon and use it, or SS 316L, or can we use Teflon tubes for cooling the solution?

Regards,

M K Mahesh [returning]
- Bangalore, Karnataka, India
May 5, 2008

A. Hi Mahesh. I expect that titanium would work; if there some history with this that suggests to you that teflon coating is required for titanium tubing?

Regards,

Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
October 2019

Q. What material should be used for making coil for chilling plant use for keeping temperature low or maintain in acid tin plating which doesn't contaminate or react with tin plating solution?

RAJIV kalyani
- Mumbai/ Maharashtra India
October 16, 2019

A. Hi Rajiv. Although I don't recall using titanium coils with acid tin plating, they have been used with nickel plating, acid zinc plating, and other solutions ... and I'm not seeing a reason they shouldn't be fine for acid tin. Be sure to ground as advised by manufacturer. Advise if anyone feels differently please.

Regards,

Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
October 2019

A. If it is a fluoborate tin bath, which is unlikely, then do not use titanium.

Lyle Kirman
Consultant - Cleveland Heights
November 6, 2019

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