Through the accelerated wathering test of immersion-wet-dry combined cycles is applied to simulate the process of atmopheric corrosion, and the electrochemical measurement, the corrosion behaviour of A3 steel in the solution with Na_2SO_4 or NaCl or NaNO_3 steel and its rust layer formed during accelerated weathering test and protective character of the rust layer are evaluated. The effect on SO_2 concentration and temperature and humidity and each other action to corrosion of zinc is discussed by way of the method of variance analysis, and the effect on continuous and intermittent spary way to corrosion of zinc is explained. The aspect and component and construction of the corrosion products of SEMand EPMA and XRD and XPS, corrosion mechanism of A3 steel in mixed medium of Na_2SO_4+NaCl and zinc in high humidity environment included SO_2 gas is discussed emphatically.
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