海泥中硫酸盐还原菌对碳钢腐蚀行为的影响

利用交流阻抗测试技术、扫描电镜及表面能谱、失重 法、微生物分析等方法，在室内模拟条件下研究了海泥中硫酸盐还原菌对碳钢腐蚀的影响，及在含和不含硫酸盐还原菌的海泥构成的宏电池腐蚀中碳钢的腐蚀行为.180天的试验结果表明，在有菌泥中碳钢的自然腐蚀速度均大于在灭菌泥中，两者相差35倍.说明海泥中硫酸盐还原菌增大了碳钢的腐蚀速率.在有菌和灭菌海泥构成宏电池时，有菌海泥中碳钢作为阳极，腐蚀速率比自然腐蚀状态下有所增大，加速率为119%.而在灭菌海泥中碳钢作为阴极，腐蚀速率比自然腐蚀状态下有所减小.     

硫酸盐还原菌对X70钢土壤宏电池腐蚀的影响

利用极化曲线、电化学阻抗、扫描电镜和表面能谱等方法,研究了硫酸盐还原菌对X70钢在土壤中宏电池腐蚀的影响.结果表明,接菌或灭菌粘土和砂土组成的宏电池,砂土中试样为宏电池的阴极,粘土中试样为阳极；随实验时间的增加,接菌及灭菌粘土中自然埋藏X70钢腐蚀速率逐渐减小,而砂土中宏电池阳极的腐蚀速率一直相当高；接菌土壤宏电池的电流和电动势比灭菌的大,接菌及灭菌粘土中阳极的腐蚀速率分别是自然腐蚀速率的4.93和2.45倍；在宏电池阴阳极面积比15∶1情况下,接菌及灭菌粘土中宏电池阳极的腐蚀速率分别为宏电池阴阳极面积比11时的5.01及2.33倍.     

不同土壤湿度下硫酸盐还原菌对锌腐蚀的影响

利用微生物分析、交流阻抗测试技术等方法 ,研究了在不同湿度的同一类型土壤中硫酸盐还原菌对纯锌腐蚀的影响。结果表明 :土壤湿度对菌类生长的影响是显著的 ,硫酸盐还原菌量随着湿度的提高有递增现象 ;在不同的湿度下 ,接菌土壤中纯锌腐蚀速率和点蚀深度都明显大于灭菌土壤 ;随着含水量的增大 ,纯锌腐蚀速率也增大 ,当土壤含水量增大到 10 %～ 15 %时 ,腐蚀速率达到最大 ,然后腐蚀速率随着湿度增大而趋于减小 ;纯锌在接菌及灭菌土壤中的阻抗图谱均表现为单容抗半圆 ,在接菌土壤中阻抗值及阻抗半圆均比在灭菌土壤中小很多 ,说明硫酸盐还原菌增大了纯锌在土壤中的腐蚀速率。     

在不同Cl-含量土壤中硫酸盐还原菌对Q235钢腐蚀的影响

利用交流阻抗测试技术、扫描电镜及表面能谱分析、失重法、微生物分析等方法，研究了在同一类型不同Cl-含量的土壤中，硫酸盐还原菌对Q235钢腐蚀的影响规律.136天的试验结果表明：随着土壤中Cl-含量的增大，Q235钢腐蚀速率也增大，当Cl-含量增大到0.5%时，腐蚀速率达到最大；随后腐蚀速率随着土壤中Cl-含量的增大而减小，当土壤中Cl-含量高于1%时，接菌土壤与灭菌土壤中Q235钢腐蚀速率相差不大.在土壤中Cl-含量低于1%时，接菌土壤中Q235钢腐蚀速率明显大于灭菌土壤的腐蚀速率；点蚀速率在不同Cl-含量的土壤中的变化规律与腐蚀速率的变化有所不同，点蚀速率基本随着土壤中Cl-含量的增加而增大.而且接菌土壤中的点蚀速率大于灭菌土壤的点蚀速率. TG174.5  硫酸盐还原菌； 含Cl-土壤； Q235钢； 微生物腐蚀 2003-01-13 2003-05-08     

不同湿度土壤中硫酸盐还原菌对碳钢腐蚀的影响

利用微生物分析、失重法、交流阻抗测试技术、扫描电镜及表面能谱等方法，研究了在不同湿度的同一种土壤中，硫酸盐还原菌对碳钢腐蚀的影响规律。结果表明，土壤湿度对菌类生长的影响是显著的，硫酸盐还在菌随着湿度的提高呈递增趋势；在相同的湿度下，接菌土壤中A3钢腐蚀速率和点蚀深度都明显大于灭菌土壤，说明硫酸盐还原菌加速了A3钢在土壤的中的腐蚀；随着含水量的增大，A3钢腐蚀速率首先增大，当土壤含水量增大到15%－20%，腐蚀速率达到最大，然后腐蚀速率随着湿度增大而趋于减小；最大腐蚀深度出现在土壤含水量为15%左右时。　 碳钢 土壤湿度 硫酸盐还原菌 微生物腐蚀     

土壤中SRB及Cl^—对1Crl8Ni9Ti不锈钢腐蚀的相互影响

利用交流阻抗测试技术、扫描电镜及表面能谱、失重法、微生物分析等方法，研究了在不同Cl^-含量的土壤中，硫酸盐还原菌对1Crl8Ni9Ti不锈钢腐蚀的影响规律。136d的试验结果表明，不同Cl^-含量土壤中SRB菌量在23000—35000(个／克土)之间，Cl^-的加入并没有显著影响SRB的生长，随着Cl^-的加入土壤中SRB的菌量有增大的趋势；随着土壤中Cl^-含量的增大，不锈钢腐蚀电位负偏移，而且在接菌土壤中的腐蚀电位比在灭菌土壤中负移幅度更大；不锈钢在灭菌土壤中没有发生点蚀现象，而在接菌土壤中发生了严重的点蚀，最大点蚀深度随着土壤中Cl^-含量的增加而增大，这说明在土壤中SRB及Cl^-的共同作用下，增大了不锈钢的点蚀敏感性。不锈钢在灭菌土壤中的阻抗图谱表现为一个半径很大的容抗弧，而在接菌土壤中的阻抗图表现为两个时间常数的双容抗弧。     

土壤中SRB及Cl-对1Cr18Ni9Ti不锈钢腐蚀的相互影响

利用交流阻抗测试技术、扫描电镜及表面能谱、失重法、微生物分析等方法 ,研究了在不同Cl-含量的土壤中 ,硫酸盐还原菌对 1Cr18Ni9Ti不锈钢腐蚀的影响规律 .13 6d的试验结果表明 ,不同Cl-含量土壤中SRB菌量在2 3 0 0 0～ 3 5 0 0 0 (个 /克土 )之间 ,Cl-的加入并没有显著影响SRB的生长 ,随着Cl-的加入土壤中SRB的菌量有增大的趋势 ;随着土壤中Cl-含量的增大 ,不锈钢腐蚀电位负偏移 ,而且在接菌土壤中的腐蚀电位比在灭菌土壤中负移幅度更大 ;不锈钢在灭菌土壤中没有发生点蚀现象 ,而在接菌土壤中发生了严重的点蚀 ,最大点蚀深度随着土壤中Cl-含量的增加而增大 ,这说明在土壤中SRB及Cl-的共同作用下 ,增大了不锈钢的点蚀敏感性 .不锈钢在灭菌土壤中的阻抗图谱表现为一个半径很大的容抗弧 ,而在接菌土壤中的阻抗图表现为两个时间常数的双容抗弧     

A3钢在海泥中的腐蚀行为

对A3钢在模拟海泥环境中进行了埋片试验和电化学试验,以研究海底管道在含硫酸盐还原菌(SRB)海泥中的腐蚀行为.结果表明,A3钢在砂泥中的腐蚀速率明显高于在海砂中的腐蚀速率,随温度的升高,A3钢在海砂中的腐蚀速率升高;且随温度的升高、SRB和SO42-含量的增加,A3钢在砂泥中的腐蚀速率随之升高;在无菌海泥中A3钢的腐蚀速率随温度升高而增大,主要是由于作为阴极去极化剂的氧的扩散速度随温度升高而增大;在有菌海泥中SO42-能参与阴极去极化而加速A3钢的腐蚀.     

土壤湿度变化对Q235钢的硫酸盐还原菌腐蚀影响

利用交流阻抗测试技术、极化曲线、扫描电镜及表面能谱、微生物分析等方法,研究了在土壤水分的自然蒸发过程中,Q235钢在接菌及灭菌土壤中腐蚀行为.40 d的试验结果表明,随着土壤中水分的自然蒸发,土壤中含氧量随土壤湿度降低而增大,土壤中硫酸盐还原菌逐渐减少,接菌及灭菌土壤中Q235钢的腐蚀速率逐渐增大,其中在接菌土壤中的腐蚀速率增幅更大.     

含硫酸盐还原菌土壤中阴极保护对Q235钢腐蚀的影响

利用交流阻抗测试技术、扫描电镜及表面能谱、微生物分析等方法，研究了阴极保护对土壤中Q235钢硫酸盐还原菌腐蚀的影响.30天的实验结果表明，在相同的阴极极化电位下，有菌土壤中Q235钢所需要的阴极极化电流密度均大于灭菌土壤，有菌土壤中Q235钢的平均腐蚀速率均大于灭菌土壤.随着阴极极化电位负移的增大，有菌及灭菌土壤中Q235钢试件周围土壤逐渐呈碱性，有菌土壤中Q235钢试件周围土壤中硫酸盐还原菌数量逐渐减少，当阴极极化电位为-1050 mV时，Q235钢试件周围土壤中硫酸盐还原菌仍能够存活.     

Effect of sulphate reducing bacteria on corrosion of Al?Zn?In?Sn sacrificial anodes in marine sediment

Microbiologically influenced corrosion (MIC) of Al? Zn? In‐Sn sacrificial anodes in marine sediment was investigated by exposing samples to sulphate reducing bacteria (SRB). Samples exposed to the sterile marine sediment were used as control. The results show that pitting corrosion occurs in both the sterile marine sediment and the SRB‐containing marine sediment. However, the corrosion can be increased sharply by the SRB metabolic activity due to the cathodic depolarization effect. In fact, the effect is based on the consumption of hydrogen which probably results in the acceleration of galvanic corrosion between corrosion products and metal substrate.     

The corrosion of two aluminium sacrificial anode alloys in SRB-containing sea mud

Corrosion of two sacrificial anodes in marine sediment with and without sulphate-reducing bacteria (SRB) was performed. Weight loss experiments indicated that the corrosion rate of Al–Zn–In–Sn was 2–3 times higher than that of Al–Zn–In–Mg–Ti in the SRB-containing sediment. Electrochemical analysis suggested that the corrosion rates of the two anodes were enhanced substantially by SRB. Surface analysis revealed the localised corrosion of the two sacrificial anodes in abiotic and biotic sediments. The concentration of Al³⁺ in the surface of the samples immersed with SRB was lower than that of the samples without SRB.     

Effects of anaerobe in sea bottom sediment on the corrosion of carbon steel

The in‐situ study of steel corrosion in sea bottom sediment (SBS) was carried out by Transplanting Burying Plate method (TBP method). It was found that the corrosion rate of steel in the sea bottom sediment with sulfate reducing bacteria (SRB) could be as high as ten times of that in sea bottom sediment without SRB. The experiments in simulated sea bottom sediments with different SRB contents by artificial culturing showed that the electrochemical behavior of steel in the sea bottom sediment with SRB was different from that without SRB. SRB altered the polarization behavior of steel significantly. The environment was acidified due to the activity of SRB and the corrosion of steel was accelerated. The corrosion of carbon steel in sea bottom sediment is anaerobic corrosion, and the main factor is anaerobe. There are SRB commonly in SBS, and the amount of SRB decreases along with the depth of sediment. Because of the asymmetry and variation of sea bottom sediment, the most dangerous corrosion breakage of steel in SBS is local corrosion caused by SRB. So the main countermeasure of corrosion protection of sea bottom steel facilities should be controlling of the corrosion caused by anaerobe.     

Prediction of marine sediment corrosion by fuzzy clustering analysis

Along with the development of marine industries, especially marine petroleum exploitation, more and more pipelines are buried in the marine sediment. It is necessary and useful to know the corrosion environment and corrosiveness of marine sediment. In this paper, field corrosion environmental factors were investigated in Liaodong Bay marine sediment containing sulfate‐reducing bacteria (SRB) and corrosion rate of steel in the partly sediment specimens were determined by the transplanting burying method. Based on the data, the fuzzy clustering analysis (FCA) was applied to evaluate and predict the corrosiveness of marine sediment. On that basis, the influence factors of corrosion damage were discussed.     

Corrosion failure of marine steel in sea‐mud containing sulfate reducing bacteria

The corrosion failure behavior of marine steel is affected by stress, which exists in offshore structures at sea‐mud region. The sulfate reducing bacteria (SRB) in the sea‐mud made the steel more sensitive to stress corrosion cracking (SCC) and weaken the corrosion fatigue endurance. In this paper, a kind of natural sea‐mud containing SRB was collected. Both SCC tests by slow strain rate technique and corrosion fatigue tests were performed on a kind of selected steel in sea‐mud with and without SRB at corrosion and cathodic potentials. After this, the electrochemical response of static and cyclic stress of the specimen with and without cracks in sea‐mud was analyzed in order to explain the failure mechanism. Hydrogen permeation tests were also performed in the sea‐mud at corrosion and cathodic potentials. It is concluded that the effect of SRB on environment sensitive fracture maybe explained as the consequences of the acceleration of SRB on corrosion rate and hydrogen entry into the metal.     

仿生超滑表面对Al基体微生物腐蚀防护性能与机制研究

采用电化学刻蚀-表面修饰-全氟聚醚油注入三步法在模板材料纯Al表面制备了仿猪笼草超滑表面,研究了仿生超滑表面对典型腐蚀微生物-硫酸盐还原菌的附着及所致腐蚀的影响.结果表明,仿生超滑表面在静态和动态环境均可明显抑制硫酸盐还原菌的附着,这主要是由于仿生超滑表面作为一种"类液体"表面,无法为细菌的附着提供锚点.同时,全氟聚醚油可通过阻止腐蚀性介质向基体的渗入,抑制基底Al的腐蚀过程.该研究的开展可为海洋微生物腐蚀防护材料的开发提供理论依据和模型.     

The corrosion behavior of 70/30 copper‐zinc alloy under the biofilm of sulfate‐reducing bacteria

A laboratory study was carried out on the effect of the biofilm of sulfate‐reducing bacteria (SRB), which plays an important role in corrosion of 70/30 copper‐zinc alloy in culture media under anaerobic condition. The API medium was used to culture the SRB in Zhongyuan oilfield. Potential/time measurement showed that the presence of SRB makes the corrosion potential more active with SRB growth metabolite. Electrochemical impedance spectroscopy (EIS) was used to analyse the electrode process of 70/30 Cu‐Zn alloy with SRB biofilm. Scanning electron microscopy (SEM) examinations revealed the formation of biofilm and corrosion products during exposure to SRB‐containing culture medium. X‐ray diffraction and EDS were used to analyse the corrosion products. The results show that the variation of activity of the SRB biofilm changes with SRB growth by the linear polarization resistance (R_p) and the EIS in culture medium inoculated SRB.     

SRB 对 X70 钢在土壤模拟溶液中腐蚀行为的影响

采用失重法、SEM、EDS微观分析方法和电化学阻抗技术研究了X70钢在有/无SRB的侵蚀性土壤模拟溶液中的腐蚀行为。结果表明,在无菌介质中,X70钢表面生成不具有保护性的腐蚀产物,其腐蚀速率随浸泡时间的延长而增大;在有菌介质中,钢表面形成致密的生物膜,对界面传质有一定的阻碍作用,从而减轻X70钢的腐蚀。腐蚀产物的吸附及S含量随浸泡时间的延长而增加,使得腐蚀产物膜疏松易脱落,促进了基体的腐蚀。无菌介质中腐蚀产物内层的稳定性与腐蚀产物的沉积及分布有关;而在有菌介质中,多孔的胞外聚合物对活化过程中的质量传输过程有一定阻碍作用。     

Corrosion behavior of B30 Cu-Ni alloy and anti-corrosion coating in marine environment

The corrosion behavior of B30 Cu-Ni alloy in a sterile seawater and a SRB solution was investigated. The results show that the corrosion potential of specimen in the SRB solution is much lower than that in the sterile seawater. The polarization resistance of specimen in the SRB solution decreases quickly after a period immersion and becomes much lower than that in the sterile seawater. It is concluded that the SRB accelerates the corrosion process of B30 Cu-Ni alloy greatly. An anti-corrosion electroless Ni-P coating was produced and applied to the alloy. The results show that specimens coated with Ni-P plating exhibit favorable corrosion resistance property in SRB solution. Severe pitting corrosion appears on the uncoated specimens in the SRB solution when the coated specimens are still in good condition. The anti-corrosion mechanism of Ni-P plating was analyzed. It is concluded that coating the B30 Cu-Ni alloy with electroless Ni-P plating is an effective technique against the attack of SRB in marine environment.