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Effects of H2SO3 on the corrosion behavior of X70 steel in weak acid solutions

GUO Hong1,2；HE Xiao-ying2   

  1. 1. Analysis ＆ Testing Center,Shandong University of Technology,Zibo 255049,China；2. Department of Chemistry,China West Normal University,Nanchong 637002,China
  • Received:2206-08-14 Revised:1900-01-01 Online:2007-10-24 Published:2007-10-24
  • Contact: GUO Hong

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Abstract: The corrosion behavior of X70 steel in weak acidic solutions with various concentrations of H2SO3 was studied by means of the static weight loss method, potentiodynamic polarization curves, electrochemical impendence spectroscopy, scanning electron microscopy and energy dispersive X-ray analysis.　The results show that with increasing H2SO3 concentration, the corrosion depth of X70 steel gradually increases, the charge transmite impendence decreases in turn, the corrosion current gradually increased, and the corrosion potential became first negative and then positive. The adsorptive mediate product is Fe(HSO3)ad in the process of dissolution of X70 steel in an HAc-NaAc system with H2SO3.

Key words: H2SO3, X70 steel, corrosion

CLC Number: 

  • TG17
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