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首页> 外文期刊>Antonie van Leeuwenhoek: Journal of Microbiology and serology >Corrosion of bare carbon steel as a passive sensor to assess moisture availability for biological activity in Atacama Desert soils
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Corrosion of bare carbon steel as a passive sensor to assess moisture availability for biological activity in Atacama Desert soils

机译：裸碳钢作为无源传感器的腐蚀，以评估Atacama沙漠土壤中生物活性的水分可用性

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摘要

Here we consider that the corrosion of polished bared metal coupons can be used as a passive sensor to detect or identify the lower limit of water availability suitable for biological activity in Atacama Desert soils or solid substrates. For this purpose, carbon steel coupons were deposited at selected sites along a west–east transect and removed at predetermined times for morphological inspection. The advantage of this procedure is that the attributes of the oxide layer (corrosion extent, morphology and oxide phases) can be considered as a fingerprint of the atmospheric moisture history at a given time interval. Two types of coupons were used, long rectangular shaped ones that were half-buried in a vertical position, and square shaped ones that were deposited on the soil surface. The morphological attributes observed by SEM inspection were found to correlate to the so-called humectation time which is determined from local meteorological parameters. The main finding was that the decreasing trend of atmospheric moisture along the transect was closely related to corrosion behaviour and water soil penetration. For instance, at the coastal site oxide phases formed on the coupon surface rapidly evolve into well-crystallized species, while at the driest inland site Lomas Bayas only amorphous oxide was observed on the coupons.
机译：在这里，我们认为抛光的辐射金属杯的腐蚀​​可以用作被动传感器，以检测或识别适用于Atacama沙漠土壤或固体基材的生物活性的水可用性下限。为此目的，碳钢试样沿西部横断率沉积在选定的地点，并在预定时间去除了形态学检查。该方法的优点是氧化物层（腐蚀程度，形态和氧化阶段）的属性可以被认为是在给定的时间间隔的大气湿度历史的指纹。使用两种类型的优惠券，长矩形形状的垂直位置中的长矩形，并且沉积在土壤表面上的方形形状。发现SEM检查观察的形态学属性与从局部气象参数确定的所谓的残忍时间相关。主要发现是，沿横断面的大气水分趋势降低与腐蚀行为和水土渗透密切相关。例如，在优惠券表面上形成的沿海网站氧化物相快速地发展成良好结晶的物种，而在最干燥的内陆部位Lomas Bayas仅在优惠券上观察到无定形氧化物。

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