Limiting corrosion of aluminum:

The conditions which have proven to be most effectual in limiting corrosion of aluminum are as follows.

1          Maintaining pH slightly acidic along with the value of the pH depending largely upon operating temperature

2          Elimination of dissolved oxygen

3          Elimination of solid and soluble impurities

4          Prevention of the introduction of organic impurities

5          Pretreatment (or pickling)

6          Maintaining water purity

Figure: Effect of pH on Aluminum Corrosion and Oxide Solubility