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Can I use NaOH solution instead of NaCl in Salt Spray test?

Q. I want to compare two alloys in terms of corrosion resistance in a low-concentration NaOH solution for a long time exposure. Can I use NaOH as a test solution?

Thank you

Bastian AZ
- Quebec QC, Canada
February 20, 2023

A. Hi Bastian.
Interesting question! You can of course, but your real question is whether anything much will be learned from it.
Salt spray testing is usually not for comparing one material to another, because the corrosion mechanisms in real life vs. salt spray are so different. Rather its primary role is as a QA measure to show that processes are functioning the same today as last week and last month.

But you don't seem to want to extrapolate so much as simplify & automate the exposure of the alloys to an NaOH solution, so I think it will be useful. There are a plethora of corrosion resistance charts, of course, but whether they cover the alloys you have in mind I wouldn't know.
Luck & Regards,

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

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