Effect of Simulated Dynamic Atmospheric Environment on Corrosion Behavior of Hot Rolled Steel Plate
The corrosion rate of hot rolled steel plate(SPHC)was studied in dynamic driving and temperature and humidity environment.The morphology and phase of the corroded surface of SPHC steel after 5 days,7 days and 20 days were analyzed by scanning electron microscopy(SEM)and X-ray diffraction(XRD).The results show that the corrosion rate of SPHC steel under the simulated dynamic atmospheric environment is higher than that under the single operation,and the corrosion rate of both of them presents a similar nonlinear change trend with the test time.In the first five days of the test,the corrosion rate increased rapidly,and Fe2O3 was formed on the surface of the rust layer,which was the initial acceleration stage of the corrosion process.On the 7th day of the test,the corrosion rate began to decrease,and the rust layer was relatively dense,and Fe2O3 and α-FeOOH were formed on the corroded surface,which enhanced the corrosion resistance of SPHC steel.However,when the test continued to the 20th day,the corrosion rate again rose to a higher level,the rust layer began to peel off,and the surface generated Fe2O3,trace amounts of α-FeOOH and Fe3O4 corrosion products.
SPHC steeldynamic and static corrosion conditionsCorrosion behavior
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