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The corrosion behavior of the as-received steel and the spheroidized steel in acidic chloride environ-ment was investigated.The results indicate the corrosion mode and corrosion rate of two steels are diverse due to their difference in microstructure.For as-received steel with ferrite-pearlite microstruc-ture,severe localized corrosion happens on the pearlite regions,and plenty of cathodic cementite remains in the pits,further strengthening the micro-galvanic effect and accelerating the corrosion rate.While for spheroidized steel with tempered martensite microstructure,the nanosized cementite particles evenly distributed on the ferrite substrate are easy to fall off,which can significantly reduce the cementite accumulation on the steel surface,relieving the acceleration effect of micro-galvanic corrosion.