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The atmospheric corrosion of A3 steel with deposited (NH4)(2)SO4 particles has been investigated at 298 K and relative humidity of (85 +/- 5) %. Corrosion kinetics curves show that A3 steel with deposited (NH4)(2)SO4 particles corroded more seriously than that without (NH4)(2)SO4 particles. IR, SEM/EDAX and XPS were utilized to study the development and characterization of corrosion products. The results indicate that A3 steels with (NH4)(2)SO4 particles corroded much faster than that without (NH4)(2)SO4 particles, and the corrosion of A3 steel initiated along the deposition area of (NH4)(2)SO4 particles, and formed basic iron sulfate. A corrosion mechanism was proposed to explain the observation.