Effect of pyridine and its derivatives on corrosion of 0040,2826MB,and 2605–8–2 metallic glasses in sulphuric acid solution at 25°C

Abstract

The inhibiting effect of 1, 2, and 3 vol.-% additions of the heterocyclic nitrogeneous compounds pyridine, piperidine, and 3-picoline on the corrosion of 0040 (Fe₄₀Ni₄₀B₂₀), 2826MB (Fe₄₀Ni₃₈MO₄B₁₈), and 2605–S–2 (Fe₇₈B₁₃Si₉) metallic glasses in 0·1M sulphuric acid solution at 25°C has been studied by potentiostatic cathodic and anodic polarisation. The 0040 and 2826MB metallic glasses showed good passivation in the presence of inhibitors, whereas 2605–S–2 did not passivate. All the additions act as mixed inhibitors and obey the Langmuir adsorption isotherm. Their effectiveness at 2 vol.-% concentration is in the order: 3-picoline > piperidine > pyridine. Piperidine is more effective than 3-picoline at 3 vol.-% concentration.

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