Pitting Corrosion Behavior of Q235 Carbon Steel in NaHCO3+NaCl Solution under Strain

doi:10.11902/1005.4537.2015.084

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (3): 238-244 DOI: 10.11902/1005.4537.2015.084

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Pitting Corrosion Behavior of Q235 Carbon Steel in NaHCO₃+NaCl Solution under Strain

Yangheng LI,Yu ZUO(

),Yuming TANG,Xuhui ZHAO

School of Materials Science and Engneering, Beijing University of Chemical Technology, Beijing 100029, China

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Abstract

The effect of strain on the pitting behavior of Q235 carbon steel in solutions of NaHCO₃+NaCl was studied by means of potentiodynamic polarization measurement, EIS and XPS. The results show that in a solution of 0.2 molL^-1 NaHCO₃+0.01 molL^-1 NaCl, a strain of 8% leads to an obvious increase of the pitting potential E_b of Q235 steel, but as the Cl^- concentration increased, the difference between the E_b values of strain and strain free samples decreased. When the Cl^- concentration increased to 0.1 molL^-1, the difference of E_b values disappeared. Besides, strain caused lower impedance, smaller charge transfer resistance R_ct and decreased the ratio Fe³⁺/Fe²⁺ in the passive film, thereby reduced the stability of passive film. The phenomenon that strain caused the increase of E_b was attributed to that the strain promoted the anodic dissolution of Fe which in turn promoted the preferential adsorption of HCO₃^- on the surface, as the result the harmful effect of Cl^- on the passive film was inhibited. As the ratio HCO₃^-/Cl^- in the solution decreased, the effect of HCO₃^- decreased and finally disappeared.

Key words: Q235 steel pitting corrosion strain HCO3- passive film

Received: 11 May 2015

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Yangheng LI,Yu ZUO,Yuming TANG,Xuhui ZHAO. Pitting Corrosion Behavior of Q235 Carbon Steel in NaHCO₃+NaCl Solution under Strain. Journal of Chinese Society for Corrosion and protection, 2016, 36(3): 238-244.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.084 OR https://www.jcscp.org/EN/Y2016/V36/I3/238

Table 1 Compositions of Q235 carbon steel and 304 stainless steel (mass fraction / %)

Fig.1 Size and shape of tensile sample (mm)

Fig.2 Electrochemical testing device under strain

Fig.3 Polarization curves of Q235 steel samples with and without 8% strain in 0.01 molL^-1 NaCl+0.2 molL^-1NaHCO₃ solution

Fig.4 Average E_b values and their distributions for Q235 samples with and without 8% strain in 0.2 molL^-1 NaHCO₃ solutions with different NaCl concentrations

Fig.5 Potentiodynamic polarization curves of 304SS in 3.5%NaCl (a) and 3.5%NaCl +0.3 molL^-1 NaHCO₃ (b) solutions with and without 8% strain

Fig.6 Bode (a) and Nyquist (b) plots of Q235 carbon steel with and without 8% strain in 0.01 molL^-1 NaCl+ 0.2 molL^-1 NaHCO₃ solution after potentiodynamic polarization to 40 mV at 0.1 mVs^-1

Table 2 Values of equivalent components of Q235 carbon steel with and without 8% strain in 0.01 molL^-1 NaCl+0.2 molL^-1 NaHCO₃ solution after potentiodynamic polarization to 40 mV

Fig.7 Fitted Fe2p (a) and O1s (b) XPS spectra of Q235 surface without strain in 0.01 molL^-1 NaCl + 0.2 molL^-1 NaHCO₃ solution after potentiodynamic polarization to 40 mV

Fig.8 Fitted Fe2p (a) and O1s (b) XPS spectra of sample surface with 8% strain in 0.01 molL^-1 NaCl solution with 0.2 molL^-1 NaHCO₃ after potentiodynamic polarization to 40 mV

Table 3 Variations of each substance concentration and Fe³⁺/Fe²⁺ ratio determined from Fe2p peaks in XPS spectra of the passive film surface formed on Q235 without and with 8% strain

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