Understanding Corrosion in Water Pipelines: A Guide for Pipeline Designers


Aluminum Chloride

Last updated: April 4, 2016

What Does Aluminum Chloride Mean?

Aluminum chloride is an anhydrous white (when pure) salt compound formed by the reaction of aluminum and chlorine solutions. Its chemical formula is AlCl3.

In cosmetics it is used in its neutral form as an additive in deodorants and antiperspirants. It is also used in therapies to treat auxiliary sweating.

Aluminum chloride is a major product of corrosion in the petrochemical industry.

Aluminum chloride is also known as trichloroalumane.


Corrosionpedia Explains Aluminum Chloride

Although aluminum chloride is white in color in its pure state, it appears yellow when contaminated with other compounds, such as iron trichloride. Its color may also change to yellow or gray when exposed to moisture.

Aluminum chloride salt is non-toxic; hence it is used in many common preparations.

The corrosion rate of this salt under air-saturated solutions is high and it is unstable at high temperatures. The passivity of aluminum does not prevent the penetration of chloride molecules.

Aluminum chloride is produced in pitting corrosion or anodic corrosion when the aluminum ion is stabilized during the oxidation and reduction of the aluminum substrate.




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