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《Materials Protection》 2008-08
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Inhibitive Action of Sodium Tungstate for X70 Steel in Sodium Sulfate Solution

JIANG Li,HE Xiao-ying,DENG Zu-yu,LUO Su-xing,LIAO Fang(School of Chemistry and Chemical Engineering,West China Normal University,Nanchong 637002,China).  
The inhibitive action of Na2WO4·2H2O for X70 steel in 0.5% Na2SO4 solution was investigated by means of potentiodynamic polarization technique and electrochemical impedance spectrometry(EIS).Results showed that Na2Wo4·2H2O as a mixed-type inhibitor was dominated by restrain of anode process,and the inhibition efficiency increased and then decreased with increasing concentration of Na2WO4·2H2O in the concentration range studied.The optimal concentration was 200 mg/L,and the inhibition efficiency at this level of concentration reached 80.4%.Moreover,the inhibitive action of Na2WO4·2H2O for the X70 steel decreased and then stabilized with extending immersion time.
【Fund】: 四川省科技厅重点项目(04jy029-100)
【CateGory Index】: TG174.42
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