【摘 要】
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The corrosion performance of high strength weathering steel with Cu,Cr micro-alloying under as-rolled,annealed,normalized,and TMCP states was studied.Results showed that the microstructures of steels
【机 构】
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College of Materials Science and Engineering,Nanjing University of Aeronautics and Astronautics,Nanj
论文部分内容阅读
The corrosion performance of high strength weathering steel with Cu,Cr micro-alloying under as-rolled,annealed,normalized,and TMCP states was studied.Results showed that the microstructures of steels under as-rolled,annealed and normalized states were composed of pearlite and ferrite.Average grain size of as-rolled steel was the largest,followed by annealed and normalized.The microstructure of TMCP was mainly consisted of martensite.The corrosion potentials of naked steels in TMCP,as-rolled,annealed and normalized states had little difference,but the corresponding corrosion currents were 0.1287× 10-5A·cm-2,0.4418 × 10-5A·cm-2,0.7364× 10-5A·cm-2 and 1.064× 10-5A·cm-2,respectively.However,the variation tendency of polarization resistance was contrary to the corrosion currents.After two months,the polarization resistance of the TMCP steel decreased to 1304 ·cm2,but the annealed,as-rolled and normalized steel increased to 1881Ω·cm2,1561Ω·cm2 and 1068Ω·cm2,respectively.The arrangement of annual corrosion rate from high to low was: normalized,as-rolled,annealed and TMCP steel,and the rule of rust layer from thick to thin was similar.
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