Corrosion behaviour of the extruded and unidirectionally solidified AlAl4Ca eutectic alloy in a neutral sodium chloride solution |
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Authors: | L Peraldo Bicelli C Romagnani D Sinigaglia |
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Affiliation: | Istituto di Chimica Fisica, Elettrochimica e Metallurgia del Politecnico di Milano, Centro di studio sui processi elettrodici del C.N.R., Piazza Leonardo da Vinci, 32-20133 Milano, Italy |
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Abstract: | The corrosion behaviour of extruded and unidirectionally solidified AlAl4Ca eutectic alloy in a neutral sodium chloride solution has been compared with the behaviour of commercially pure Al and AlCu alloy. From both anodic and cathodic cyclic linear potentiodynamic measurements and from S.E.M. observations it was possible to point out that the corrosion behaviour of unidirectionally solidified alloy is substantially equal to that of the extruded alloy, slightly different from that of commercially pure Al and better than AlCu alloy. Therefore, the use of this new lamellae-reinforced AlAl4Ca composite is promising, even though from the corrosion point of view further studies involving different techniques and conditions (solutions, temperature, surface state, stress, etc.) should be undertaken. |
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