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采用EIS,PC,SEM和EDS等方法,通过在硫酸盐还原菌(SRB)的一个生长周期内测试Zn-Al-Cd牺牲阳极在不含和含SRB海泥中的腐蚀行为,以对比研究海泥中SRB对其腐蚀行为的影响.EIS和PC测试结果显示,实验初期,试样在2种海泥中的腐蚀速率都快速增大,但由于SRB的大量增长,其对试样的腐蚀作用不断增强,所以在含SRB海泥中的腐蚀速率一直大于在不含SRB海泥的腐蚀速率;实验后期,由于SRB的大量死亡,其对试样的腐蚀作用已经十分微弱,因此2者的腐蚀速率逐渐变得比较接近.SEM分析显示,2种海泥中的试样表面都出现大量的腐蚀坑,但含SRB试样表面的腐蚀程度更为严重.EDS结果显示含SRB试样表面的Zn和Al含量明显低于无SRB试样,说明了试样在含SRB海泥中的腐蚀溶解速度相对较大.
By using EIS, PC, SEM and EDS, the corrosion behavior of Zn-Al-Cd sacrificial anodes in SRB-free seawater was tested in a growth cycle of sulfate-reducing bacteria (SRB) The effect of SRB on the corrosion behavior of mud in the mud.The results of EIS and PC show that the corrosion rate of the sample in the two kinds of mud increases rapidly at the beginning of the experiment, but the corrosion of the sample due to the large increase of SRB So the corrosion rate in SRB-containing sea mud is always higher than that in SRB-free sea mud. In the late stage of experiment, due to the large number of deaths of SRB, its corrosion effect on the sample has been very weak, so the corrosion of the two And the rate gradually became closer.The results of SEM showed that a large number of corrosion pits were found on the surface of the two kinds of sea mud samples but the corrosion on the surface of the sample containing SRB was even more serious.The EDS results showed that the surface Zn And Al content was significantly lower than the SRB sample, indicating that the dissolution rate of the sample in the SRB mud is relatively large.