Corrosion Inhibitor for Solder in Heat Transfer Solution?
Corrosion Inhibitor for Solder in Heat Transfer Solution?
(OP)
Could anyone tell me a corrosion inhibitor for solder for use in a heat transfer system that is nitrite, amine, phosphate, borate and silicate free?





RE: Corrosion Inhibitor for Solder in Heat Transfer Solution?
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
RE: Corrosion Inhibitor for Solder in Heat Transfer Solution?
RE: Corrosion Inhibitor for Solder in Heat Transfer Solution?
The heat transfer fluid is water with a 5% organic acids as corrosion inhibitors. However they have performed poorly versus only the solder.
RE: Corrosion Inhibitor for Solder in Heat Transfer Solution?
Tin 29.5-31.5%
Lead 67.5-69.5%
+ traces of Sb, Ag, Cu, Cd, Al. Bi, As, Fe and Zn
RE: Corrosion Inhibitor for Solder in Heat Transfer Solution?
Have you tried a search for non-corroding water?
Your key might lie in control of the Saturation Index.
For solders I think I would start with Lucas Milhaupt 800 558-7006.
Were it my project I would look at automobile coolants and anti-freezes to start. You might be able to use something off the shelf.
tom
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
RE: Corrosion Inhibitor for Solder in Heat Transfer Solution?
I am actually working in the automobile coolants buisness, as part of the procedure for developing new products we need to ensure that they do not corrode a selection of metals. The coolant I am working on performs well against everything but the solder. I'm afraid I cant simply go and buy an off the shelf product as I am trying to develop a rival to said products. We have to use corrosive water (water with added sulfate, chloride and carbonate ions) for this specific test. As you say it is probably the lead that is the issue so I need to find an inhibitor for it. I can find plenty of inhibitors but none that are free from nitrite amine etc.
RE: Corrosion Inhibitor for Solder in Heat Transfer Solution?
Also try "inhibiting solder corrosion"
From the way you describe it, it sounds like you are really close on a good product. Good Luck.
Also try the solder people.
Tom
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Corrosion Inhibitor for Solder in Heat Transfer Solution?
Acids like acetic would be very bad.
I've used certain organic acids to dissolve Pb in one of our processes.
RE: Corrosion Inhibitor for Solder in Heat Transfer Solution?
RE: Corrosion Inhibitor for Solder in Heat Transfer Solution?
This is pure "Edisonian",I would try a phosphomolybdate as a starting point since you have excluded the normal array of corrosion inhibitors. The molybdates are quite common as inhibitors in cooling water systems.
I have no information as to the stability of your salt but based on other fatty acids it probably has some very defined temperature limitations.
Another is to try the Calcium salt in place of the potassium salt.
RE: Corrosion Inhibitor for Solder in Heat Transfer Solution?
As for using Calcium Hydroxide I think that is a no-go looking at the Health Risks of using it on an industrial scale.
RE: Corrosion Inhibitor for Solder in Heat Transfer Solution?
I would look at the molybdates used in CTW systems as there are quite a number of formulations. We used several different formulations in our water systems until we got one with acceptable results.
RE: Corrosion Inhibitor for Solder in Heat Transfer Solution?
Thanks for the responses appreciate it
lighterthief