How to Measure Aluminum Corrosion
Corrosion is a natural process that occurs to metals when they are exposed to the elements. Like most metals, aluminum becomes oxidized when exposed to the air for long periods of time and the chemical interaction with water produces rust. The naturally occurring effects of corrosion are a major concern for builders and other manufacturers of aluminum based goods. The stages of corrosion can be measured through a visual analysis. There are four stages of corrosion you should be able to identify. Understanding the telltale signs of each stage will give you an accurate measurement of how far along the corrosion has progressed.
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Instructions
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Inspect the aluminum metal before any corrosion has occurred. The metal should have no imperfections and look new.
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Analyze the aluminum after it has been exposed to the elements for several days. Exposure to the air and water should create the beginning stages of corrosion. Slight discoloration and small signs of rust will be visible during the first stage of corrosion.
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Look for granular and dust-like buildup on the aluminum. This is a telltale sign of the second stage of corrosion. Corrosion spots will be red, white or black in color. The surface can also become rough.
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Inspect the aluminum for small pinholes, which indicate that corrosion is in its third stage. Other physical characteristics include those you would find in stage two corrosion -- powdery buildup, discoloration and rough surface.
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Find areas of the aluminum that have been completely eroded away. Large holes, severe discoloration and a general lack of structural integrity are the hallmarks of the fourth and most advance stage of corrosion.
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