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Bacterial Phosphating of Mild (Unalloyed) Steel

机译:低碳(非合金)钢的细菌磷化

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摘要

Mild (unalloyed) steel electrodes were incubated in phosphate-buffered cultures of aerobic, biofilm-forming Rhodococcus sp. strain C125 and Pseudomonas putida mt2. A resulting surface reaction leading to the formation of a corrosion-inhibiting vivianite layer was accompanied by a characteristic electrochemical potential (E) curve. First, E increased slightly due to the interaction of phosphate with the iron oxides covering the steel surface. Subsequently, E decreased rapidly and after 1 day reached −510 mV, the potential of free iron, indicating the removal of the iron oxides. At this point, only scattered patches of bacteria covered the surface. A surface reaction, in which iron was released and vivianite precipitated, started. E remained at −510 mV for about 2 days, during which the vivianite layer grew steadily. Thereafter, E increased markedly to the initial value, and the release of iron stopped. Changes in E and formation of vivianite were results of bacterial activity, with oxygen consumption by the biofilm being the driving force. These findings indicate that biofilms may protect steel surfaces and might be used as an alternative method to combat corrosion.
机译:将轻度(非合金)钢电极在需氧的,可形成生物膜的红球菌sp。的磷酸盐缓冲液中进行培养。菌株C125和恶臭假单胞菌mt2。导致形成抑制腐蚀的堇青石层的所得表面反应伴随有特征性电化学势(E)曲线。首先,由于磷酸盐与覆盖钢表面的铁氧化物的相互作用,E略有增加。随后,E快速下降,并在1天后达到-510 mV,这是游离铁的电位,表明已除去了氧化铁。此时,只有散布的细菌块覆盖了表面。开始发生表面反应,其中释放出铁并沉淀了云母。 E在-510 mV处保持约2天,在此期间,堇青石层稳定生长。之后,E显着增加到初始值,并且铁的释放停止。 E的变化和Vivianite的形成是细菌活动的结果,生物膜消耗的氧气是驱动力。这些发现表明生物膜可以保护钢表面,并可以用作抗腐蚀的替代方法。

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