For the electrogalvanizing treatment, considering its anticorrosion mechanism is due to the sacrificial erosion of metal zinc, which leads to the improvement of corrosion prevention effect. In the part of contact with metal aluminum, the battery erosion effect causes the consumption of zinc, so that the internal metal is exposed, and then the electrochemical erosion of aluminum will occur. This phenomenon also occurs in the aluminum metal material and galvanized steel contact parts.

Generally speaking, when two metals or alloys with different electrode potentials come into contact, electrochemical erosion, namely battery erosion, will occur.

For the zinc based chromium salt treatment coating, because its anticorrosion mechanism is based on the blunt effect of chromic acid and controlled sacrifice of zinc protection, so the consumption of zinc, so also improved the anti corrosion function of the mess, the internal metal is not exposed, it will resist the erosion of aluminum.