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Electrochemical study of the pitting corrosion of aluminium and its alloys—II. Study of the interaction of chloride ions with a passive film on aluminium and initiation of pitting corrosion

✍ Scribed by L. Tomcsányi; K. Varga; I. Bartik; H. Horányi; E. Maleczki

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
428 KB
Volume
34
Category
Article
ISSN
0013-4686

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✦ Synopsis

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, potential.

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