Measurement research for pitting potential of aluminium alloy with chromate passivation layers

This paper describes common technology for measuring corrosion resistant properties of aluminium alloy with chromate passivation layers. It gives a resolution to characterize corrosion resistant properties of pitting potential. The method, including sample preparation, measuring polarization and the determining of pitting corrosion potential, was proposed. Tests of repeatability and reproducibility can meet the demand of measurement precision. In addition, comparison of the positional relationships between polarization curves and nominal pitting corrosion potential was provided to judge products.