Sunday, January 30, 2011

Aluminum Corrosion Penetration as a Function of pH

Aluminum Corrosion Penetration as a function of pH

Possibly the best corrosion prevention for aluminum is a neutral pH water wash to eliminate build-up of alkaline salts and then control of pH in the range of 4.0 to 8.5. The protective oxide film that protects aluminum from corrosion is stable and naturally self-renewing. Many cleaners are either alkaline or acidic (citrus based).  Soapy water is highly alkaline.  At pH values greater than 10, the oxide film starts to dissolve, resulting in rapid corrosion unless controlled by inhibitors.

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