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Study of microbial corrosion in aluminum alloy (AA2024-T3) by Antarctic microorganisms

机译：南极微生物对铝合金（AA2024-T3）微生物腐蚀的研究

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Aluminum alloys 2024 are widely used as aircraft structural material due to its featured properties, such as its high ratio strength / weight and good resistance to fatigue. However, this alloy is susceptible to localized corrosion type. Several environmental factors may facilitate or accelerate corrosion of aluminum this, One of these is the presence of microorganisms. These are found in all environments and are able to adhere to surfaces and modify the physicochemical conditions at the metal / solution interface, through the production of extracellular metabolites and by generating differential aeration cells. As a result, microorganisms can contribute to corrosion by altering the electrochemical conditions at the metal surface. Addition it has been found in aircraft operating in Antarctica, they present a more accelerated corrosion compared to those in operation in other areas of the Chile. In order to study this effect in the alloy corrosion product samples of a Twin Otter aircraft operating in the Antarctic Chilean base they were taken, and it contains microorganisms that produce the enzyme catalase. Has been studied the effect of this enzyme and is described as a accelerating of the reduction reaction of oxygen, and thus accelerates the overall corrosion process. Studies of electrochemical impedance spectroscopy and polarization curves determine the influence of these microorganisms in the process of aluminum 2024-T3 after a hundred days of exposure.
机译：铝合金2024由于其高强度/重量比和良好的抗疲劳性等特性而被广泛用作飞机结构材料。但是，这种合金易受局部腐蚀类型的影响。几个环境因素可能会促进或加速铝的腐蚀，其中之一是微生物的存在。这些物质可在所有环境中找到，并能够粘附到表面并通过产生细胞外代谢产物并通过产生不同的曝气池来改变金属/溶液界面处的物理化学条件。结果，微生物可以通过改变金属表面的电化学条件来促进腐蚀。此外，在南极洲运营的飞机中发现了这种腐蚀，与在智利其他地区运行的飞机相比，腐蚀加速了。为了研究在南极智利基地运营的双水獭飞机的合金腐蚀产物样品中的这种影响，将其采样，其中包含产生过氧化氢酶的微生物。已经研究了这种酶的作用，并被描述为加速了氧气的还原反应，从而加速了整个腐蚀过程。电化学阻抗谱和极化曲线的研究确定了这些微生物在暴露100天后对铝2024-T3过程的影响。

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