Abstract
The composition of the passive layer on aluminium and reformation of this layer during cathodic polarization were investigated by radiotracer and electrochemical methods in the presence of sulphate and chloride ions. Chloride ion is not ab- or adsorbed on the passive layer but, attacks this layer as a chemical reaction partner. Therefore, the pitting corrosion of aluminium and its alloys is a combined electrochemical and chemical process. The cathodic reformation of passive layer is indicated by the changing of the concentration of bonded chloride ion, the changing of hydrogen overvoltage as well as the shift of E π potential.
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