Effect of Hydrostatic Pressure on Electrochemical Behavior of X100 Steel in NaHCO3+NaCl Solution

doi:10.11902/1005.4537.2015.082

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (3): 219-224 DOI: 10.11902/1005.4537.2015.082

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Effect of Hydrostatic Pressure on Electrochemical Behavior of X100 Steel in NaHCO₃+NaCl Solution

Xiangnan MENG,Xu CHEN(

),Ming WU,Yang ZHAO,Yuwen FAN

School of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China

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Abstract

Effect of hydrostatic pressure on the electrochemical corrosion of X100 pipeline steel in 0.5 mol/L NaHCO₃+0.03 mol/L NaCl solution was investigated by means of methodspotentindynamic polarization, electrochemical impedance spectroscopy and Mott-Schottky. The results show that with the increasing hydrostatic pressure the number and the size of corrosion pits increase,while the activity of ions in the solution also increases, which in turn promotes the adsorpting of Cl^-in the passive film. As a result, the corrosion rate and the corrosion current density are increased. The component of the passive film transforms from oxide or hydroxide formed by low pressures to carbonate by high pressures, which may result in the decrease of corrosion-resistance and increase of probability of pitting corrosion nucleation. The passivation film formed on the X100 steel exhibits characteristics of n-type semiconductor. The increase amount of Cl^- in the passivation film promotes the increase of lattice imperfections and facilitates the cracking of the oxide film.

Key words: X100 steel hydrostatic pressure passivation film electrochemical behavior

Received: 26 July 2015

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	Xiangnan MENG
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	Yuwen FAN

Cite this article:

Xiangnan MENG,Xu CHEN,Ming WU,Yang ZHAO,Yuwen FAN. Effect of Hydrostatic Pressure on Electrochemical Behavior of X100 Steel in NaHCO₃+NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2016, 36(3): 219-224.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.082 OR https://www.jcscp.org/EN/Y2016/V36/I3/219

Fig.1 Corrosion morphologies of X100 steel after corrosion in 0.5 mol/L NaHCO₃+0.03 mol/L NaCl solution for 7 d at 0.1 MPa (a), 1 MPa (b), 1.5 MPa (c) and 2 MPa (d)

Fig.2 Potentiodynamic polarization curves of X100 steel in 0.5 mol/L NaHCO₃+0.03 mol/L NaCl solution at different pressures

Fig.3 Nyquist (a) and Bode (b) plots of X100 steel atdifferent pressures

Fig.4 Equivalent circuit of EIS

Table 1 Fitted results of X100 steel after corrosion in 0.5 mol/L NaHCO₃+0.03 mol/L NaCl solution at different pressures

Fig.5 M-S plots of X100 steel after corrosion in 0.5 mol/L NaHCO₃+0.03 mol/L NaCl solution at different pressures

Fig.6 Donor density and flat-band potential of X100 steel in 0.5 mol/L NaHCO₃+0.03 mol/L NaCl solution at different pressures

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