CORROSION BEHAVIORS OF LOW ALLOY STEEL AND CARBON STEEL DEPOSITED WITH NaCl AND NaHSO<SUB>3</SUB> UNDER DRY/HUMID ALTERNATIVE CONDITION

The corrosion behaviors of low alloy steel P265GH and carbon steel Q235 deposited with NaCl and NaHSO_3 under dry/humid alternative condition were investigated by FTIR,XRD,SEM and galvanostatic method.The results reveal that under present experimental condition,corrosion rates of low alloy steel and carbon steel decrease with prolonging time and their mass losses are almost identical.Besides,corrosion resistance of low alloy steel P265GH is not better than that of carbon steel Q235.The corrosion products formed on the two steels are mainly composed ofδ-FeOOH,α-FeOOH, Fe_3O_4,γ-FeOOH and sulphate,among whichδ-FeOOH is predominant.The existence ofδ-FeOOH accounts for the decrease of corrosion rates of the steels.