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1.
有硫酸盐还原菌存在时J55套管钢的极化行为   总被引:7,自引:0,他引:7  
朱绒霞 《腐蚀与防护》2001,22(4):147-148,172
在接种硫酸盐还原菌(SRB)的培养基中,通过测量J55钢的极化曲线,分析了SRB对腐蚀过程的影响,结果表明,SRB的代谢产物-H2S对阳极过程和阴极过程影响很大,有显著的去极化作用。  相似文献   

2.
硫酸盐还原菌对铜镍合金腐蚀的影响   总被引:7,自引:1,他引:7  
利用电化学测试技术,在实验室条件下研究了硫酸盐还原菌(SRB)对铜镍合金腐蚀行为的影响。实验结果表明,SRB的存在使电极开路电位明显负移,极化电阻在细菌生长后期迅速降低。在含SRB的溶液中,铜镍合金表面会形成由腐蚀产物和SRB等组成的混合膜,腐蚀速度受到Cu通过混合膜向电极表面扩散速度的控制。  相似文献   

3.
在原SRB-HX-14型硫酸盐还原菌测试瓶的基础上,对培养基配方和生产工艺进行了优化调节,研制了SRB-HX-7型硫酸盐还原菌快速测试瓶。采用该快速测试瓶测定水样中硫酸盐还原菌的含量仅需7天就能得到结果,比原测试瓶测试时间缩短了50%。使用大庆油田四个采油厂的34份水样进行对比试验表明:SRB-HX-7型测试瓶在大大加快SRB测试速度的基础上,具有与SRB-HX-14型测试瓶相同的适应性、准确度和可靠性。  相似文献   

4.
The assessment of ability to absorb hydrogen of three API grade pipeline steels: X52, X70 and X100 have been evaluated. The factors of cathodic hydrogen charging, time of exposure, and applied stress were taken into account. It has been shown that all steels demonstrate the sensitivity to hydrogenating in deoxygenated, near-neutral pH NS4 solution under relatively “soft” cathodic polarisation, although the efficiency of hydrogen permeation in metal is quite low and depends on time of exposure. Applied tensile stress, which equivalent to gross hoop stress in pipe wall under operating conditions, can accelerate the hydrogen absorption in several times. For studied steels the resistance to hydrogen absorption decreases with decreasing of steel strength.  相似文献   

5.
铜离子杀菌剂灭活SRB的研究   总被引:2,自引:0,他引:2  
袁斌  刘贵昌  徐磊 《腐蚀与防护》2005,26(5):187-188,199
通过静态的SRB培养实验,考察铜离子最低杀菌浓度与水样初始菌量的关系;铜离子最低杀菌浓度与作用时间的关系;铜离子和其它三种杀菌剂在单项或不同组合情况下对水样中SRB杀灭效果。实验结果表明,最低杀菌浓度随初始菌量的增大而增大;杀菌剂与水样的接触时间90min最佳;与其它杀菌剂相比,铜离子对SRB的灭活效果更好,当铜离子和其它杀菌剂共同作用时,协同作用效果不明显。  相似文献   

6.
Electropolishing treatment (EP) can be used to remove the biofilm formed on AISI-304 stainless steel surface and protect it against bacterial colonization. High levels of both smoothness and brightness of AISI-304 stainless steel surfaces can be attained by using electropolishing technique, where the sample was fixed as anode and a suitable current was applied into electrolytic cell containing H3PO4. AISI-304 stainless steel was exposed to stabilized mixed culture of sulfate reducing bacteria (SMC-SRB) under different conditions as, temperature, pH, salinity, incubation time and inoculum size. The present study recorded the main indicators of bacterial activity such as S−−, Fe++, most probable number (MPN) of SRB and weight loss (corrosion rate) by milinches per year (mpy). The results revealed that the bacterial counts were obviously decreased under all conditions of bacterial biofilm formation after electropolishing treatment.  相似文献   

7.
采用丝束电极研究硫酸盐还原菌生物膜的电化学不均匀性   总被引:2,自引:0,他引:2  
将丝束电极技术应用于硫酸盐还原菌 (SRB)生物膜的不均匀性研究 ,观察细菌生长过程中电极电位随时间的变化规律 ,进而反映生物膜的不均匀性。结果表明 ,电极表面电位分布不均匀性导致生物膜生长的不均匀性 ,而硫酸盐还原菌生长繁殖进一步促进了生物膜的不均匀性 ,且SRB的新陈代谢产物加速了局部腐蚀的发展。  相似文献   

8.
    
The accumulation process of sulfate reducing bacteria (SRB) biofilms established in anaerobic stagnant batch bioreactors on the surface of carbon steel and the nutrient transport and corrosion products distribution in it were characterized by X‐ray Photoelectron Spectroscopy (XPS). In addition, the corrosion occurrence and development of carbon steel under SRB biofilm was investigated by Electrochemical Impedance Spectroscopy (EIS) in‐situ. The results show that the thickness of SRB biofilms increases exponentially with time in the beginning and after 14 days reaches a maximum. From then on, the accumulation rate decreases to zero. In mature biofilms, SRB dispersed throughout the biofilm. In the inner layer near the substrate, due to the high sulfate‐reducing activity of SRB, corrosion products such S2?, H2S and organic acid are present, which lead to corrosion occurrence and development. In the outer layer of the biofilm SRB can also reduce the SO2?4 to SO2?3 and S2O2?3. This metabolism process enhances the Fe2+ transfer from the inner to the outer side. The activity of SRB in the biofilm plays a key role in the initial corrosion process.  相似文献   

9.
对氢在Cr5钢锭退火过程中的扩散建立了数学模型,以matlab软件对该模型进行求解,模型估计与实测值较相吻。该模型可用于指导和优化去氢退火工艺,对减少白点报废率具有一定的意义。  相似文献   

10.
中原油田文10—1井套管腐蚀原因分析   总被引:6,自引:1,他引:6  
通过现场检测和腐蚀产物X衍射分析,对文10-1井套管的腐蚀原因进行了探讨,检测结果表明是以内壁腐蚀为主,套管上部腐蚀严重,下部腐蚀轻微,两者腐蚀产物中铁的硫化物不同,室内试验研究了温度对硫酸盐还原菌(SRB)生长的影响,以及SRB对套管钢的腐蚀作用,文10-1井套管严重腐蚀部位的腐蚀产物为疏松的Fe9S8。而腐蚀轻微处主要是较致密的FeS。  相似文献   

11.
海洋微生物腐蚀的研究进展   总被引:6,自引:0,他引:6  
刘光洲  吴建华 《腐蚀与防护》2001,22(10):430-433
介绍了国内外海洋微生物腐蚀研究的最新进展,讨论了海洋中影响金属腐蚀的几类微生物,评述了微生物腐蚀研究中涉及的微生物的培养,测量方法以及表面分析手段;简介了不锈钢,铜和铜合金,镍合金的微生物腐蚀的特征和最新研究进展,并展望了微生物腐蚀研究的发展趋势。  相似文献   

12.
介绍了加钛、稀土等超低碳钢的化学成分和合金特点,分析了钢中析出相的类型、尺寸和数量,测定了氢在钢中的穿透时间和扩散系数,研究了析出相对氢在钢中穿透时间的影响。结果表明,添加足量钛或复合添加稀土、钛和铌的超低碳钢既具有超深冲性能,又具有足够长的氢穿透时间,从而实现了成形性能和抗鳞爆性能的良好匹配。  相似文献   

13.
Abstract

Accelerated low water corrosion of steel piling in sea water harbours in the UK, Europe and elsewhere has been shown recently to be the result primarily of water pollution. Elevated levels of dissolved inorganic nitrogen in sea and brackish waters are responsible for microbiologically influenced corrosion of steel piling below the low water tide level. This is demonstrated in field data from 13 Australian experimental sites, nine US naval sites and some severe sites in Australia, Norway, Japan and the UK. Localised perforation of sheet piling, often associated only with the webs of U and Z profile piles, is shown to be the result of centreline segregation, porosity and composition differences in steel profiles. These stem from the steelmaking process and are likely to be less severe for modern steels. The results explain most of the observations for actual steel piling in various harbours, both vertically and horizontally (i.e. for U and Z and other pile profile types).  相似文献   

14.
采用最大可能计数法对两种季盐型缓蚀剂BHP 1及BHP 2的杀菌效果进行了评价。结果发现 ,BHP 1具有良好的杀菌性能 ,且最佳杀菌浓度为 6 0× 10 -6g/L ,两者的杀菌效果均优于广泛使用的新洁尔灭。采用电化学方法、腐蚀失重实验及表面分析法研究了 4 5 # 碳钢在含硫酸盐还原菌 (SRB)的厌氧体系中的腐蚀行为。结果表明 :SRB能加速 4 5 # 碳钢的点蚀破坏。两种季盐能有效控制SRB溶液对 4 5 # 碳钢的腐蚀破坏 ,使点蚀电位正移 ,对SRB溶液中的 4 5 # 碳钢具有良好的缓蚀作用 ,缓蚀效果为BHP 1>BHP 2  相似文献   

15.
用自制的实验研究发现:水玻璃砂与铜合金形成机械粘砂的渗透压力为0.18MPa。可用铝矾土醇基快干涂料,改善大型铜合金铸件的表面质量。  相似文献   

16.
    
Desulfotomaculum kuznetsovii (D. kuznetsovii), a thermophilic sulfate‐reducing bacterium (SRB), was identified in a cooling tower of a petroleum refinery by 16S rRNA gene sequencing and its functional gene encoding dissimilatory sulfite reductase (dsrAB). The thermophilic sulfate‐reducing bacterial species have been reported for the first time in the cooling towers of an Indian petroleum refinery. The protein coded by dsrAB gene was cloned, expressed, and identified using recombinant DNA technology. Weight loss method, electrochemical and surface analysis showed the corrosion behavior of the isolate. In the presence of D. kuznetsovii, the corrosion rate was higher when compared to control at 55 °C. It suppresses the anodic reaction and enhances the cathodic reaction by the production of organic complex and iron sulfide, respectively. Numerous pitting were noticed on mild steel which is due to the presence of D. kuznetsovii and its role in the corrosion process has been discussed.  相似文献   

17.
针对泥炮中液压冲击这一现象,分别用液压仿真和计算法分析。仿真和计算法得到的结果与实际中的结果一致,对实际系统具有一定的指导意义。仿真结果显示,泥炮打泥时,如果回油路发生突然的堵塞,如不及时处理,会有很大的压力冲击,对系统产生破坏。  相似文献   

18.
单丽梅  赵平 《表面技术》2007,36(4):39-41,56
为了了解氢渗透阻挡层的阻氢机理,在氢化锆表面电镀Cr-C后,再对镀层进行热处理(400℃),最后把试样在700℃的真空中保温10h.用EDS法对没有进行热处理的镀层的成分进行分析,再用X射线光电子能谱(XPS)研究氢渗透阻挡层不同深度处的化学态,并对阻挡层原子进行定量分析.结果发现:未热处理的镀层主要含有C和Cr,阻挡层中含有C、O、Cr和Zr,进行氢渗透试验(700℃保温)后的阻挡层中C-H和O-H含量都增加,前者更明显.由此可说明H因破坏C、O原来的成键方式而被C、O捕捉,C对氢渗透阻挡层的作用大于O的作用.  相似文献   

19.
一种新型钢筋阻锈剂的阻锈性能   总被引:1,自引:0,他引:1  
以极化曲线法、失重法和半电池电位法评价了一种新型钢筋阻锈剂的阻锈性能,并采用EDS手段表征了阻锈剂的渗透性能。结果表明,阻锈剂对混凝土中钢筋有阻锈作用,Cl-含量较低时,阻锈效果明显,缓蚀率达85%;Cl-含量较高时,阻锈效果不明显。阻锈剂通过涂刷方法能够很快渗透到混凝土内部,到达钢筋周围,对在役钢筋混凝土管架有很好的防护作用。  相似文献   

20.
    
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