Hot corrosion resistances of yttrium-implanted and unimplanted low-manganese-carbon steels

Yttrium-implanted and unimplanted low-manganese-carbon steel samples were a nalyzed at T = 700 degreesC and under an oxygen partial pressure P-O2 = 0.0 4 Pa for 24 h to observe the yttrium implantation effect on sample hot corr osion resistance. The yttrium implantation effect on low-manganese-carbon s teel was investigated using several analytical and structural techniques su ch as Rutherford backscattering spectrometry (RBS), X-ray photoelectron spe ctroscopy (XPS), reflection high energy electron diffraction (RHEED), X-ray diffraction (XRD) and glancing angle X-ray diffraction (GAXRD) before the high-temperature oxidation lest. Sample oxidation behaviors were studied by thermogravimetry and by in-situ high-temperature XRD with the same experim ental conditions. The aim of this work is to show the initial nucleation st age of the main compounds induced by oxidation at high temperature accordin g to the initial sample treatment (yttrium-implanted or unimplanted). Our r esults allow a better understanding of the improved corrosion resistance of yttrium-implanted low-manganese-carbon steel at high temperature. (C) 2000 Elsevier Science Inc. All rights reserved.