Effect of cathodic polarization and sulfate reducing bacteria on mechanical properties of different steels in synthetic sea water
Effect of cathodic polarization and sulfate reducing bacteria on mechanical properties of different steels in synthetic sea water
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DOI：
10.1002/maco.200604024
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发表时间：
2007-06-01
影响因子：
1.8
通讯作者：
Birn, J.
中科院分区：
文献类型：
--
作者：
Domzalicki, P.;Lunarska, E.;Birn, J.
在使用专门设计的设备进行的慢应变速率拉伸试验中，已表明低合金铁素体-珠光体和索氏体钢的断裂伸长率、断面收缩率、断裂能降低，并且对强度没有影响，这些钢在对应于阴极保护的电位（-800至-1400 mV（SCE））下在合成海水中极化。SRB的存在促进了塑性损失，在电位-1100至1200 mV（SCE）下尤其明显。在较高的阴极极化，塑性估计在接种和无菌水均衡。这种影响与吸收氢和渗透氢的含量有关。SRB在低、中等阴极极化条件下促进充氢和塑性损失是导致S-2离子生成和抑制存款形成的主要原因。硫酸盐还原菌在高阴极极化下的影响可以忽略不计，这是由于近表面溶液的高碱化抑制了硫酸盐还原菌的生长。相同量的氢对索氏体产生的有害影响小于对铁素体-珠光体钢产生的有害影响。然而，在类似的阴极极化下，索氏体钢吸收最高量的氢，并显示出最显著的降解。在海水中受到硫酸盐还原菌作用的建筑物的阴极保护应提供这样的条件，在这种条件下，海洋建筑物的任何碎片都不会被与钢的塑性性能的最大退化（-1100至-1200 mV（SCE））相对应的电位极化。
At the slow strain rate tensile tests done using the specially designed facility, the decrease in the elongation to fracture, reduction of area, fracture energy and no effect on the strength have been stated for the low alloy ferrite-pearlite and sorbite steels, polarized in synthetic sea water at potentials corresponding to the cathodic protection (- 800 to - 1400 mV(SCE)). Presence of SRB promotes the plasticity loss, being especially pronounced at potentials - 1100 to - 1200 mV(SCE). At higher cathodic polarization, the plasticity estimated in inoculated and in sterile water equalizes. The effects have been correlated with the contents of absorbed and of permeable hydrogen. The promotion of hydrogen charging and the plasticity loss by SRB at the low and medium applied cathodic polarization has been accounted for the observed production of S-2 ions and inhibition of deposit formation. The negligible effect of SRB at the high cathodic polarization has been suggested to be a result of the suppression the SRB growth due to the high alkalization of the near surface solution. The same amount of hydrogen produces the less detrimental effect on the sorbite than on the ferrite-pearlite steel. However, at the similar cathodic polarization, the sorbite steel absorbs the highest amount of hydrogen and reveals the most pronounced degradation. Cathodic protection of constructions subjected to the action of SRB in the sea water should provide the conditions, under which no fragment of marine construction could be polarized by potential corresponding to the maximum degradation of the plastic properties of steels (- 1100 to - 1200 mV(SCE)).