研究了从浸泡在中国南海的钢铁锈层中分离的腐蚀性硫酸盐还原菌Desulfovibrio bizertensis SY-1在-0.85和-1.05 V vs.SCE阴极极化电位下对X70管线钢腐蚀行为的影响.结果表明,-0.85 Vvs.SCE电位尚不能有效抑制Desulfovibrio bizertensis SY-1细胞的生长与附着,同时试片表面也检测到了特征的四方硫铁矿和针铁矿的Raman峰.-1.05 V vs.SCE阴极极化电位能够有效抑制浮游Desulfovibrio bizertensis SY-1细胞的生长和代谢过程,腐蚀产物以磁铁矿为主.失重数据也表明,在-1.05 V vs.SCE电位下试片失重与无菌条件基本一致,且在该电位下最大点蚀坑深度与无极化条件相比减少了 75％.该研究为含有Desulfovibrio bizertensis SY-1环境的阴极保护电位选择和微生物与极化电位的相互作用研究提供了参考.
Effect of Desulfovibrio Bizertensis SY-1 on Corrosive Behavior of Metal Materials Under Cathodic Polarization
The effect of sulfate-reducing bacteria(SRB)strain Desulfovibrio bizertensis SY-1,which isolated from rust scales on steels formed in the South China Sea,on the corrosion behavior of X70 pipe-line steel was investigated at different polarized potentials of-0.85 and-1.05 V vs.SCE.The results showed that neither of the planktonic cell growth or the attached cells could not be effectively inhibited at the-0.85 V vs.SCE cathodal polarization potential.The Raman analysis showed that the corrosion prod-uct of mackinawite and goethite were both detected by this applied polarization potential.Under the ap-plied polarization potential of-1.05 V vs.SCE,the growth and metabolic process of planktonic D.bizer-tensis SY-1 cells could be effectively inhibited,and the corrosion products were mainly magnetite.The mass loss data also showed that the mass loss of coupons at the polarization potential of-1.05 V vs.SCE was basically the same as that in the sterile condition,and the maximum pitting depth at this poten-tial was reduced by 75％compared with those in non-polarized condition.The results provide a reference for the selection of cathodic protection potential and the study on the interaction between microorganisms and polarization potential in the environment containing D.bizertensis SY-1.
万方数据
维普
