What Are The Factors That Cause The Corrosion of Aluminum Aerosol Cans?

The factors that cause the corrosion of aluminum aerosol can are like these:

1. The nature of the filler: type and concentration of acid or alkali,pH,wettability,penetration,solvents,and surfactants.

2. The composition in top space:air,propellant or volatile substances.

3. The uniformity,defects and chemical resistance of the coating.

4. The nature of the substrate:aluminum purity and the type of impurity.

For the canning maker,the nature of the filler and the top space is difficult to control,the substrate can be selected but the choice is not large,but the coating can be selected and controlled.So controlling film is the key to control the corrosion of aluminum aerosol cans.

The uniform corrosion in the aluminum aerosol cans is very few,which means that the chemical resistance of the paint itself is good,if the coating can be ensured that the thickness is enough,as long as the election of the varieties is right, chemical resistance has no problem.If there is a uniform corrosion,the choice of paint inside may has problem, a very small number of cases is the use of wrong methods.

The usual way of corrosion is causing pit corrosion and perforation,where the coating is defective,such as shrinkage(exposed aluminum),abrasions,necks, microcracks,aluminum chips,etc.

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