CORROSION BEHAVIOUR OF ALUMINIUM AND ITS ALLOYS IN MOLTEN SODIUM

J Chin Soc Corr Pro

1998, Vol. 18

Issue (3): 193-197 DOI:

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CORROSION BEHAVIOUR OF ALUMINIUM AND ITS ALLOYS IN MOLTEN SODIUM

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Abstract Corrosion behaviour of high purity aluminium(99.999%Al), industrial high purity aluminium(LGl, 99.85%), Al-Si and Al-Mg alloys immersed in molten chemically pure sodium at 350-450℃ for 25-100h have been investigated. Structural morphology and alloying element distributions of the specimens were analysed with the aid of OM, SEM, XRD and EPMA methods. Experiments indicated that high purity aluminium immersed in molten sodium was attacked slightly instead of completely immune. The molten sodium corrosivity to aluminium depended on existing impurity, especially silicon. Addition of magnesium to some content and microalloying of zirconium as grain fining agent can improve the corrosion resistance of aluminium. Corrosion product formed on the surface of aluminium and its alloys was characterized as AlNaSi phase.

Key words: Aluminium Aluminium alloy Molten sodium Corrosion

Received: 25 June 1998

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SI Peng-cheng ZHANG Di WANG Jian LI Xi-jiang RAO Xiong (Shanghai JiaoTong University; Public Laboratory of State Education Commission of P.R.Chinafor High Temperature Materials and High Temperature Tests; Shanghai 200030). CORROSION BEHAVIOUR OF ALUMINIUM AND ITS ALLOYS IN MOLTEN SODIUM. J Chin Soc Corr Pro, 1998, 18(3): 193-197.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I3/193

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