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A new inhibitor—N-carbonyl piperazine aimed at anticorrosion of high protective 13Cr steel was synthesized by electrochemistry together with ionic liquid. Its molecule structure was analyzed by gas chromatography/mass spectrometry and infrared spectroscopy. On that base, the inhibition mechanism of N-carbonyl piperazine on the corrosion of high protective 13Cr steel in 4 M HCl had been studied by polarization, electrochemical impedance spectroscopy, weight loss, and scanning electron microscopy measurements. The results indicated that N-carbonyl piperazine acted as mixed type (cathodic/anodic) inhibitor and showed 93.7% inhibition efficiency at concentration of 44 mM.
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Zhang et al. (2012) studied this question.
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