Effect of Copper Addition on Pitting Corrosion of MA-Al

• Authors: B. Aranda , F. Cuevas , J. Cintas , M. Herrera-García , P. Urban
• Languages of publication: EN

Abstracts

EN

This paper is intended to highlight the effect of copper addition on the pitting corrosion resistance of aluminium-base powder metallurgy parts. Results obtained on these mechanically alloyed (MA) specimens are compared with parts of MA-Al without added copper, as well as with commercial aluminium alloys. Immersion tests from 2 to 96 hours in 3.5% NaCl solutions, and potentiostatic techniques, were used to study the pitting corrosion. It was concluded that copper addition, in a similar way that in commercial aluminium alloys, produces a negative effect on the pitting corrosion resistance, because of the formation of Al₂Cu. These precipitates produce galvanic cells that favour the specimen pit. Therefore, increasing the copper content of MA-Al, although improving their ductility, worsens the pitting corrosion resistance of these alloys.

Keywords

EN

81.20.Ev; 82.45.Bb

Discipline

• 82.45.Bb: Corrosion and passivation(see also 81.65.Kn Corrosion protection and 81.65.Rv Passivation in surface treatments)
• 81.20.Ev: Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2016
• Volume: 129
• Issue: 4
• Pages: 788-791

Dates

published

2016-04

Contributors

author

B. Aranda

• Escuela Técnica Superior de Ingeniería, University of Huelva, Carretera de Palos s/n, 21819, La Rábida-Huelva, Spain

author

F. Cuevas

• Escuela Técnica Superior de Ingeniería, University of Huelva, Carretera de Palos s/n, 21819, La Rábida-Huelva, Spain

author

J. Cintas

• Escuela Técnica Superior de Ingeniería, University of Seville, Camino de los Descubrimientos s/n, 41092, Sevilla, Spain

author

M. Herrera-García

• Escuela Técnica Superior de Ingeniería, University of Seville, Camino de los Descubrimientos s/n, 41092, Sevilla, Spain

author

P. Urban

• Escuela Técnica Superior de Ingeniería, University of Seville, Camino de los Descubrimientos s/n, 41092, Sevilla, Spain

References

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Identifiers

DOI

10.12693/APhysPolA.129.788