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High temperature corrosion of typical positions in SUS 30432 tubing bend tested in simulated environment

机译：在模拟环境中测试了SUS 30432弯管中典型位置的高温腐蚀

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The corrosion behaviour of typical positions in an SUS 30432 bend under simulated corrosive environments was investigated in this paper. A scanning electron microscope equipped with an energy dispersive spectrometer was used to characterise the surface and cross- section morphologies of specimens. Results show that the corrosion kinetics of all specimens were similar showing near parabolic law behaviour. The largest weight gain was located at the samples which were cut from the bottom of a bend. The corrosion scale consisted of an outer layer containing iron oxides and an inner layer containing Cr rich spinels and sulphides. The distances between grains in the samples from the bend were larger than that from the straight tube, which became smaller as the experimental time increased. It may be closely related to aggregation of dislocations near the grain boundaries after tube bending.
机译：本文研究了SUS 30432弯头在典型腐蚀环境下典型位置的腐蚀行为。使用配有能量色散光谱仪的扫描电子显微镜表征样品的表面和横截面形态。结果表明，所有试样的腐蚀动力学相似，表现出接近抛物线的行为。最大的增重位于从弯头底部切下的样品上。腐蚀垢由包含氧化铁的外层和包含富铬的尖晶石和硫化物的内层组成。弯曲处样品中晶粒之间的距离大于直管中晶粒之间的距离，随着实验时间的增加，晶粒之间的距离变小。弯曲后，可能与晶界附近的位错的聚集密切相关。

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