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Re: pH


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Posted by Dick Hourigan on July 23, 2008 at 19:30:27:

In Reply to: pH posted by afdmello on March 03, 2008 at 09:17:06:

: Why do we maintain the pH on the alkaline side.
: When both the acidic and alkaline environment are both corrosive.

: Afd

The pH you require depends upon the metal. To reduce corrosion on ferrous metals requires a high pH since they corrode more readily in acid. For Zinc or Aluminum either acidic or alkaline conditions can be corrosive. If you are reading Department of Transportation literature, they regard either acidic or alkaline material as corrosive. The quest needs to be asked: "Corrosive with regard to what material?"

Dick Hourigan
Analytical Chemist
www.RichardHouriganInc.com


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