The Corrosion Behavior of Amorphous and Crystalline Ni-Cr-Metalloid Alloys

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  • Corrosion Behavior of Amorphous and Cry

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The corrosion behavior of Ni-Cr-P-C alloys in which the Ni/Cr atomic ratio was fixed to unity was studied in connection with metallurgical structure by electrochemical measurement and X-ray diffraction. The Ni-Cr alloy was vitrifiable by the addition of 12 at% phosphorus, but was not by single addition of carbon. In 6N HCl at 30°C, both conventionally cast and melt-spun crystalline Ni-Cr alloys had low corrosion potentials less than -300mV (SCE) and showed high anodic current density of the order of 103 to 104A/m2 by anodic polarization. Once they were vitrified, they passivated spontaneously in the same aggressive solution and showed excellent corrosion resistance. The corrosion resistance of amorphous alloys was largely deteriorated even by a small amount of crystalline phase precipitation.

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