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首页> 外文会议>NACE International annual conference exposition;Corrosion 2000 >THE LULING BRIDGE: AN INSIDE STORY
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THE LULING BRIDGE: AN INSIDE STORY

机译：鲁灵桥：内部故事

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The corrosion products formed on the interior weathering steel box-sections comprising one vertical support pier of thernLuling Bridge in Louisiana, have been analyzed and compared with those formed on atmospherically exposed coupons for whichrnthe protective oxide layer is very adherent and stable. It was determined that very high fractions of large particle maghemite formrnin the hot and humid conditions inside the boxes. The high time-of-wetness also significantly reduces the fraction of nano-phaserngoethite which forms and this, along with the presence of maghemite, most likely prevents the formation of the adherentrnprotective corrosion coating needed to reduce the long term corrosion of weathering steel. The spectroscopic analysis of therncorrosion products was undertaken using MOssbauer spectroscopy, Raman spectrometry and X-ray diffraction, with morphologyrnand elemental composition of the corrosion products being completed using scanning electron microscopy with energy dispersivernspectroscopy facilities. The corrosion product composition varied with height of the box-sections in the pier, most likely due tornthe different local environmental conditions within each enclosed box. In general the corrosion products contained about 30%rnrnaghemite and 60% goethite which is very different to the compositions found on well protected weathering steels. Therncompositions were closer to those found on carbon steel structures exposed to a mild marine environment. The large amountsrnof exfoliation in the form of sheet-like rust within the box-sections, supports the argument that insufficient wet-dry cyclingrnconditions are available for proper protective coating formation.
机译：分析并分析了在路易斯安那州恩鲁林桥的一个垂直支撑墩上形成的内部耐候钢箱形截面上的腐蚀产物，并将其与在大气暴露的试样片上形成的腐蚀产物进行了比较，这些试样的保护性氧化层非常牢固且牢固。已确定在箱子内的高温和潮湿条件下会形成很高比例的大颗粒磁赤铁矿。高的润湿时间还显着减少了形成的纳米相菱铁矿的比例，并且这与磁赤铁矿的存在极有可能阻止了减少耐候钢的长期腐蚀所需的粘附保护性腐蚀涂层的形成。腐蚀产物的光谱分析采用MOssbauer光谱，拉曼光谱和X射线衍射进行，腐蚀产物的形貌和元素组成通过具有能谱仪的扫描电子显微镜完成。腐蚀产物的组成随码头中箱形截面的高度而变化，这很可能是由于每个封闭式箱体内不同的局部环境条件所致。通常，腐蚀产物包含约30％菱锰矿和60％针铁矿，这与在受到良好保护的耐候钢上发现的成分非常不同。这些成分更接近暴露于温和海洋环境的碳钢结构上的成分。箱形截面内大量呈片状锈蚀的剥落现象支持了这样的论点，即湿-干循环条件不足以形成适当的保护涂层。

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