日本金属学会誌

J. Japan Inst. Metals, Vol. 49, No. 3 (1985),
pp. 209-216

The Effect of Oxidative Oxyanions on the Corrosion Behaviour of Commercial Stainless Steels in Hot Concentrated Caustic Soda Solutions

Takashi Sakaki1 and Kazutaka Sakiyama2

1Technology Laboratories, Toyo Soda Manufacturing Co., Ltd., Yamaguchi
2Nippon Silica Industrial Co., Ltd., Yamaguchi

Abstract:

The effect of Na2CrO4, NaBiO3 and NaClO3 on the corrosion of stainless steels has been investigated mainly by means of a potentio dynamic method and measurement of corrosion loss in 48% NaOH solution at 413 K. The presence of oxidative oxyanions in the caustic solution shifted the corrosion potential of steels to the noble direction. The oxidation power of such oxyanions increased with increasing concentration of them in the solution in the following order: ClO3-3-42-. The corrosion rates of stainless steels were decided by the action which shifted the corrosion potential to the active state or the passive state. Oxidative oxyanions possessed an inhibitive effect for the corrosion of stainless steels in caustic solutions.


(Received 1984/5/11)

Keywords:

concentrated alkaline solution, corrosion resistance, effect of oxidative, oxyanions, austenitic stainless steel, ferritic stainless steel, anodic polarization, immersion test


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