锅炉腐蚀产物的穆斯堡尔谱研究

MOSSBAUER STUDY OF THE CORROSION PRODUCTS OF BOILER TUBES

本文测定了高、中压锅炉腐蚀产物的穆斯堡尔谱并鉴定其相组成。(一)实验部分1.中压锅炉腐蚀产物锈样A、B、C取自广州发电厂2~#锅炉水冷壁管内壁,管内压力40kg/cm^(2),温度250℃。锈样D、E分别取自过热器管(425℃)和省煤器管(150℃)内壁.2.高压锅炉腐蚀产物锈样F、G、H取自广东韶关发电厂3~#锅炉的水冷壁管内壁,管内压力110kg/cm^(2),温度320℃。

The corrosion products of boiler tubes,economizer and superheater were studied by Mossbauer spectroscopy.It was found that the a-Fe3O3 content in the corrosion products increased,but the Fe_(3)O_(4)content decreased,with increase of corrosion time.The corrosion process of boiler tubes should be.formation of Fe_(3)O_(4)first,and further oxidation of Fe_(3)O_(4)to a-Fe3O3.It was also found that IB/IA was<<2 in Fe_(3)O_(4).This phenomenon was probably caused by incorporating some other ions into Fe_(3)O_(4).The results were complemented by X-ray diffraction,infrared spectra,chemical analysis and electron probe analysis.