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How to prevent corrosion of industrial aluminum profiles

Update:14-11-2016
Summary:

The first is the point of corrosion, pitting corrosion […]

The first is the point of corrosion, pitting corrosion can also be known as the hole, it is produced on the needle-like, point-like, hole-like a very localized form of corrosion. Aluminum in the atmosphere, fresh water, or neutral aqueous solution will occur in the pitting, serious can also lead to perforation, but the corrosion hole may eventually stop the development of corrosion is to maintain a limit. Pitting corrosion is a unique form of anodic reaction and is an autocatalytic process. The second is galvanic corrosion, galvanic corrosion is the characteristic form of aluminum corrosion, aluminum potential is very negative, when the aluminum contact with other metals, aluminum is always in the anode to accelerate corrosion. Galvanic corrosion can also be called bimetallic corrosion, the severity of its corrosion by the two metal potential in the order of the relative position of the decision.