%0 Journal Article
%T A comparison of pitting susceptibility of Q235 and HRB335 carbon steels used for reinforced concrete
%A GUOLIANG ZHAN
%A JIANCHENG LUO
%A SHAOFEI ZHAO
%A WEISHAN LI
%J Journal of Electrochemical Science and Engineering
%D 2013
%I 
%R 10.5599/jese.2012.0025
%X The phase structure and the pitting susceptibility of two carbon steels, Q235 and HRB335, used for reinforced concrete, are investigated by phase observation, polarization curve measure-ments, electrochemical impedance spectroscopy, and Mott-Schottky analysis. It is found that Q235 is ferrite and HRB335 is pearlite. Q235 is more susceptible to chloride ions leading to pit-ting than HRB335. The polarization curves show that the breakdown potential of the passive film in saturated Ca(OH)2 solution containing 0.4 M NaCl is 0 V for Q235 and 0.34 V for HRB335. The Mott-Schottky analyses show that passive films formed on Q235 and HRB335 in saturated Ca(OH)2 solution containing chloride ions behave like an n-type semiconductor. The passive film formed on Q235 has a higher donor density, which explains why Q235 is more susceptible to pitting than HRB335.
%K Pitting susceptibility
%K Carbon steel
%K Phase structure
%K Polarization curve
%K Electrochemical impedance spectroscopy
%K Mott-Schottky
%U http://www.jese-online.org/Articles/Vol_03/No_1/Pdf/jESE_Vol3_No1_p11-17_2013.pdf