INVESTIGATION OF ATMOSPHERIC CORROSION OF CARBON STEELS PRE-CORRODED BY DIFFERENT POLLUTANTS

The atmospheric corrosion data of three kinds of pre-corroded carbon steels at Beijing and Jiangjin exposure sites are studied.The characterizations of the corrosion products formed on the samples at Beijing exposure site have been studied by FTIR and XRD.The results show that the corrosion rates of carbon steels at Jiangjin site are much greater than that at Beijing site under the same condition; the pre-corroded means have made some small differences to the kinetics behaviors of three kinds of carbon steels,but they have no difference to the corrosion phases of carbon steels after exposure over one year.The effects of different pre-corroded means on the atmospheric corrosion of carbon steels are analyzed.