Study of Al alloy corrosion in neutral NaCl by the pitting scan technique

摘要

The corrosion behavior of as polished commercial Al alloys was studied in neutral 0.6 M NaCl by means of the anodic single-cycle polarization. Qualitative interpretation of pitting scans in both de-aerated and naturally aerated NaCl solution together with the aid of morphological examination, allowed for inference of the features of localized corrosion as a function of Al substrate nature. Electrochemical characteristic parameters such as pitting (E-pit), repassivation or protection (E-prot) potentials and pit transition potential (E-ptp) were determined and discussed in comparison with those previously obtained on as received specimens.