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topic 7882

Acid Resistant Coating for Aluminum


Is there a coating for aluminum to make it HCl resistant ? I am running a process that has HCl in it and I am proposing to use an Aluminum chamber to do this. Therefore I need to protect the aluminum from the HCl, so it will last for 5-10 term.

Hugh Walton
- Auburn Hills, MI, USA


5-10 what - days-weeks-months- years.

What concentration and what temperature and what use- a few minutes a day or all of the time?

On the low end, 2 thousandths of high Phosphorous electroless nickel will work. For long term, use an appropriate specialty stainless steel.

For low budget, can you get a blow molded thick polyethylene container that you might possibly "hide" in a metal cylinder?

James Watts
- Navarre, Florida


It is possible to design in a glass reactor? Aluminum is amphoteric, meaning it will react with acids and bases, and probably not a good choice with HCl. If you really need the reactor to be metal, you may have to go with tantalum, titanium, or maybe even gold or platinum. Some stainless steels and grades are better than others at resisting chlorine attack, but none are particularly suitable for HCl.

Dale Woika
Surface Conversion Sciences - Bellefonte, Pennsylvania, USA


Try using a fluoropolymer such as Halar ECTFE, we coat a lot of parts that use acid baths and this type of coating gets the nod. Usually around 15-30 mils thick.

Josh Sonju
Sonju Industrial Inc. - Kalispell, MT, USA

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