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PITTING BEHAVIOUR OF TYPE 43O STAINLESS STEEL IN SOLUTIONS CONTAINING Cl~- AND CO_2

FU Chaoyan

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Abstract

The characteristics of pitting corrosion and corrosion mechanism for type 430 stainless steel in different solutions were studied using the electrochendcal potentiodynamic hysteresis curve technique. Inhibition performance of some inhibitors was also examined. Experimental results showed that increase in concentration of Cl-and solution temperature could accelerate the pitting of 430ss. Oxygen was one of the principal factors to keep passivity of the steel. CO2 was an accelerant for pitting. Na2MoO4 and Na3VO4 could prevent the pitting corrosion in solution containing Cl-and CO2, and they had a synergistic inhibition effect.

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The characteristics of pitting corrosion and corrosion mechanism for type 430 stainless steel in different solutions were studied using the electrochendcal potentiodynamic hysteresis curve technique. Inhibition performance of some inhibitors was also examined. Experimental results showed that increase in concentration of Cl-and solution temperature could accelerate the pitting of 430ss. Oxygen was one of the principal factors to keep passivity of the steel. CO2 was an accelerant for pitting. Na2MoO4 and Na3VO4 could prevent the pitting corrosion in solution containing Cl-and CO2, and they had a synergistic inhibition effect.

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Available abstract

The characteristics of pitting corrosion and corrosion mechanism for type 430 stainless steel in different solutions were studied using the electrochendcal potentiodynamic hysteresis curve technique. Inhibition performance of some inhibitors was also examined. Experimental results showed that increase in concentration of Cl-and solution temperature could accelerate the pitting of 430ss. Oxygen was one of the principal factors to keep passivity of the steel. CO2 was an accelerant for pitting. Na2MoO4 and Na3VO4 could prevent the pitting corrosion in solution containing Cl-and CO2, and they had a synergistic inhibition effect.

Key concepts: Materials science, Pitting corrosion, Metallurgy, Corrosion, Hysteresis, Quantum mechanics, Physics

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