CORROSION BEHAVIOR OF 304 STAINLESSSTEEL IN NaCl-(NH4)2SO4-NH4Cl SOLUTIONS

J Chin Soc Corr Pro

2007, Vol. 27

Issue (2): 84-92 DOI:

Research Report

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CORROSION BEHAVIOR OF 304 STAINLESSSTEEL IN NaCl-(NH4)2SO4-NH4Cl SOLUTIONS

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中南大学化学化工学院

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;. CORROSION BEHAVIOR OF 304 STAINLESSSTEEL IN NaCl-(NH4)2SO4-NH4Cl SOLUTIONS. J Chin Soc Corr Pro, 2007, 27(2): 84-92 .

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Abstract The corrosion behaviors of 304 stainless steel (304SS) in 3%NaCl solution and in mixed solution of 20 g/L NaCl+0.67g/L (NH4)2SO4+2.3 g/L NH4Cl were investigated using polarisation curve and electrochemical impedance spectroscopy (EIS) methods.304SS maintained its good passive state after immersed in the mixed solution for 750 h.Its average corrosion current density in this medium was determined to be of 0.056 mA/cm2.It was found from EIS studies that in 3%NaCl solution,304SS exhibited a pitting corrosion behavior of bare metal with a thin passive film;while in the mixed solution,it showed a more typical feature of stable and complete passive film.The ohmic resistance of this passive film was much smaller than the charge transfer resistance of corrosion reaction.The good anti-corrosion performance of 304SS could be mainly attributed to the inactivation of surface site rather than to the barrier effect of the passive film against the ionic conductance or against the diffusion of reactants /products.

Key words: stainless steel corrosion impedance spectroscopy garbage corrosion

Received: 24 August 2005

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