ph resistance range for sulfuric anodized aluminum

Hi. In the current project I'm dealing with a system where RO water with ph 5.5 prevails and the temperature is 80C. I would like to know what
is the ph range of aluminum with the eddition of sulfuric anodize coating.
Thanks
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On Aug 3, 6:00 am, snipped-for-privacy@gmail.com wrote:

What you have asked is less than a complete question. In order to talk about corrosion you must fully specify both the material (substrate and coatings) and the service environment. Is the material pure aluminum, or is it an alloy? If it is an alloy, what alloy? What else is in the service environment other than water? Chlorides, sulfates, etc?
I suspect that what you are asking is for the pH range over which aluminum will be passive. The best online textbook on aluminum alloys (and including their corrosion behavior) is Talat http://www.eaa.net/eaa/education/TALAT/5000/5100.htm See section 5102.04 for the Pourbaix diagram showing that at room temperature a passive film could be stable over a pH range from 4.0 to 8.5. However, you are not at room temperature.
Some nuclear reactor fuel was aluminum clad. An IAEA publication discusses corrosion of spent fuel. http://www-pub.iaea.org/MTCD/publications/PDF/TRS418_web.pdf Look at chapter 2.
Pittsburgh Pete
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