On the corrosion behaviour of magnesium and its alloys using electrochemical techniques

Measurements of Tafel slopes and impedance are used to examine the corrosion aspects of magnesium and its alloys AZ 31 (MgAlZn), AZ61 (MgAlZn) and AP 65 (MgAlPb) in aqueous magnesium perchlorate solution. Impedance studies show that the electrode/ electrolyte interfacial mechanism is activatio...

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Bibliographic Details
Published in:Journal of power sources 1996-11, Vol.63 (1), p.103-107
Main Authors: Udhayan, R., Bhatt, Devendra Prakash
Format: Article
Language:English
Subjects:
Applied sciences
Charge-transfer resistance
Corrosion
Corrosion environments
Double-layer capacitance
Exact sciences and technology
Magnesium passivation potential
Metals. Metallurgy
Nyquist plots
Tafel slope
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Summary:Measurements of Tafel slopes and impedance are used to examine the corrosion aspects of magnesium and its alloys AZ 31 (MgAlZn), AZ61 (MgAlZn) and AP 65 (MgAlPb) in aqueous magnesium perchlorate solution. Impedance studies show that the electrode/ electrolyte interfacial mechanism is activation-controlled. The results are explained in terms of stability of the film on the metal surface and on the influence of the specific alloy constituents on the hydrogen overvoltage. Variation of anodic potential during impedance measurements on magnesium alloys indicates a stepwise decrease in the charge-transfer resistance with gradual increase in anodic potential.
ISSN:0378-7753
1873-2755
DOI:10.1016/S0378-7753(96)02456-1