Experimental study on the effect of H_2S and SO_2 on high temperature corrosion of 12Cr1MoV

Hong Xu Shangkun Zhou Yiming Zhu Weigang Xu Xiaohe Xiong Houzhang Tan

【摘要】：Aiming at the high temperature corrosion in a coal-fired boiler,the effect of H_2 S and SO_2 on the corrosion of 12 CrlMoV under the water wall condition has been investigated by experiments.The results indicate that H_2 S can promote the corrosion significantly,and the coarse porous oxide film formed cannot stop the progress of corrosion.While SO_2 presents little effect on the corrosion.The main composition of the surface of 12 CrlMoV corrosion products is Fe_2 O_3.With H_2 S in the atmosphere,the corrosion gradually develops into deeper layers by forming FeS,FeO and Fe_2 O_3 alternately.The corrosion rate is doubled for every 50℃inerease in temperature at 400-500℃.

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