INFLUENCE OF CONCENTRATION OF HCO3- TO ANODIC REACTION OF X70 STEEL

J Chin Soc Corr Pro

2005, Vol. 25

Issue (1): 20-24 DOI:

Research Report

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INFLUENCE OF CONCENTRATION OF HCO3- TO ANODIC REACTION OF X70 STEEL

Chunchun Xv;Lin Chi;Gang Hu;Jie Huang;Zise Wang

北京化工大学材料科学与工程学院

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Abstract The influence of concentration of HCO3- ions discussed by comparison of cyclic voltammetric behaviors of x70 steel in solutions of different concentrations of HCO3- ions.A prepassive film was formed with the poesence of HCO3-ions.The stability of prepassive film was reduced with increasing of HCO3-ions.The formation of Fe(Ⅱ) species gpverned the electrochemical behavior of prepassive process.HCO3-ions appeared to play the dominant role in the initial dissolution of Fe. The structure of prepassive film was confirmed by XRD and IR.The film had double - layer structure.Fe(OH)2 as the composition of immer layer deduced with the increasing of concentration of HCO3- ions, while FeCO3 on the outer layer increased.

Key words: X70 steel NaHCO3/Na2CO3 solution cyclic voltammetric technology prepassive film concentration of HCO

Received: 04 July 2003

ZTFLH:

TG172

Corresponding Authors: Chunchun Xv E-mail: chunchunxu@163.com

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Chunchun Xv; Lin Chi; Gang Hu; Jie Huang; Zise Wang. INFLUENCE OF CONCENTRATION OF HCO3- TO ANODIC REACTION OF X70 STEEL. J Chin Soc Corr Pro, 2005, 25(1): 20-24 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2005/V25/I1/20

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