Cathodic polarization of Al–Sn alloy in sodium chloride solution

The results presented in this paper were obtained with two Al–Sn binary alloys (0.02 and 0.4 wt% Sn) which had been prepared on super pure (99.999%) Al base. A study of behaviour of these alloys at cathodic polarization in 2 M NaCl solution by means of electrochemical methods complemented by SEM and...

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Published inElectrochimica acta Vol. 43; no. 21; pp. 3241 - 3255
Main Authors KLISKIC, M, RADOSEVIC, J, GUDIC, S, SMITH, M
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 01.01.1998
Elsevier
Subjects
Al–Sn alloy
Applied sciences
cathodic polarization
Corrosion
Corrosion environments
Exact sciences and technology
high purity aluminium
Metals. Metallurgy
cathodic polarization
high purity aluminium
Al–Sn alloy
Tafel curve
Cathodic polarization
Open circuit
Pitting corrosion
High purity metal
Tin addition
Electrochemical corrosion
Aluminium
Potential
Impedance
Sodium chloride
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Summary:The results presented in this paper were obtained with two Al–Sn binary alloys (0.02 and 0.4 wt% Sn) which had been prepared on super pure (99.999%) Al base. A study of behaviour of these alloys at cathodic polarization in 2 M NaCl solution by means of electrochemical methods complemented by SEM and EDAX analysis provided an insight into the effect of addition of tin on the electrochemical behaviour of aluminium. It has been observed that a low tin content causes aluminium to behave hyperactively at high negative potential values, which leads to crevice formation and conditions favourable for further dissolution. The result of the change of potential in the negative direction with the alloy containing 0.4 wt% tin is superactivation of aluminium as consequence of de-filming processes.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0013-4686
1873-3859
DOI:10.1016/S0013-4686(98)00001-2