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It is well known that iron and silicon are major elements in industrial pure aluminum alloy 1100. These elements form Al‐Fe‐Si ternary intermetallic compounds such as FeAl3, Fe3SiAl12, Fe3Si2Al9, Fe2Si2Al9 etc. The corrosion characteristics of the 1100 specimen and the Al‐Fe‐Si intermetallic compound specimens are experimentally investigated in NaCl and AlCl3 solutions. The electrochemical measurements, SEM surface observation and EPMA analysis reveal that (1) the iron content of the compounds influences the initiation of pitting attacks: the higher content of iron in the compound is, the more easily occurs the initiation of pitting attack, and (2) an existence of the compound in the bottom of the active pitting cavity, whether the iron content of the compound is higher or not, contributes to the further propagation of pitting attack as a cathodic site.

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The authors propose a new method to easily and reliably determine the exchange current density (i0) of hydrogen evolution reaction (her). The validity of a novel method named the differential polarization method (DPM) was ascertained by the estimation of i0 on platinum electrode in acid solutions. The hers in 0.005, 0.05 and 0.5 mol dm −3 H2SO4 solutions were visually categorized as reversible reactions. The obtained i0 had constant values of about 0.5 mA cm −2 , corresponding to the appearance of a vertical line on the anodic polarization resistance curve. This DPM shows the i0 is corresponds to the limiting diffusion current density of the hydrogen oxidation reaction. We believe that the DPM has the potential to be a beneficial and reliable method for estimating electrochemical parameters.

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