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Anodized aluminum or stainless steel in deionized water

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⇦ (tip: readers rarely show interest in abstract questions, but people's actual situations usually prompt responses)

Q. Hi Mark,
Have you found your answer regarding compatibility of DI water and anodized Al?

Ehsan Rezaei
- Vaud [Switzerland]
August 9, 2022

A. Hi Ehsan. Mark's posting is from 2004 so he's unlikely to be monitoring this page and we're unlikely to be able to reach him. The thread linked by the "Ed. note" implies that anodizing, if sealed, is generally compatible. Mark's hard anodizing should be more resistant because it's thicker, but hard anodizing usually isn't sealed. Please tell us about your situation. We can't fully resolve Mark's situation because we're missing some data, but we can hopefully resolve yours if you provide it.

Luck & Regards,

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

A. The pH value of the water and the conditions, such as temperature, are important. Colorless oxide layers are generally stable but may become blotchy. Hard oxide coatings are more durable, especially when sealed in hot water. In Switzerland there are various finishers of such layers.

Joerg Beerli
- Hallau, Switzerland
September 15, 2022

⇩ Closely related postings, oldest first ⇩

Q. How well does anodized aluminum hold up to deionized water? How does stainless hold up to deionized water? We have a customer that wants to use one of our grippers in a deionized water washdown and is concerned with corrosion or deterioration.

Mark K [last name deleted for privacy by Editor]
Pneumatic Gripper Manufacturer - Monroe, Connecticut, USA
2004

A. Dear Mark,

It depends on your customers' needs; are you concerned about metal ions in the water or corrosion on your item? I have used a SS316 heat exchanger for DI water, and it's not corroded yet..

Best regards,

Bo König
Food industry - Odense, Denmark

Bo,

Thank you. I have been told that 3XX series stainless holds up well. My bigger concern is the hard coat anodized aluminum. I am not concerned with getting ions in the water, I am worried about our product corroding.

Regards,

Mark K [last name deleted for privacy by Editor]
Pneumatic Gripper Manufacturer - Monroe, Connecticut, USA

Ed. note -- Mark: Some additional info on aluminum usage for D.I. water is on thread 10156.

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