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通过电化学方法、腐蚀失重法、超景深三维立体显微镜和菌量测定等方法,研究了常用缓蚀剂(月桂酸、硫脲)在含有硫酸盐还原菌(SRB)的饱和CO2产出水中的缓蚀行为。结果表明:在无菌饱和CO2介质中,月桂酸、硫脲对碳钢的最大缓蚀率分别为:98.6%和94.6%,且二者均是主要控制阴极抑制型缓蚀剂。在含SRB饱和CO2介质中,月桂酸和硫脲的缓蚀性能下降,缓蚀率分别只有62.9%和53.5%,且碳钢试片表面出现大量腐蚀坑。菌量测定结果表明,月桂酸和硫脲能够促进SRB生长,且SRB代谢产物阻碍月桂酸和硫脲在碳钢金属表面吸附,因此,这两种缓蚀剂均不适用于含有SRB的工况环境中。
The effects of common corrosion inhibitors (lauric acid, thiourea) in saturated CO2-containing water containing SRB were studied by means of electrochemical methods, weight loss method, three-dimensional microscope and bacterial volume determination. Corrosion inhibition behavior. The results showed that the maximum corrosion inhibition rates of lauric acid and thiourea to carbon steel were 98.6% and 94.6% respectively in aseptic saturated CO2 medium, and both of them were the main cathodic suppression inhibitors. The corrosion inhibition of lauric acid and thiourea in the medium containing SRB saturated CO2 decreased by 62.9% and 53.5% respectively, and a large number of corrosion pits appeared on the surface of carbon steel specimens. Lactic acid and thiourea could promote the growth of SRB and the metabolites of SRB hindered the adsorption of lauric acid and thiourea on the surface of carbon steel. Therefore, neither of the two inhibitors was suitable for SRB-containing conditions Environment.