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Acta Metall Sin  1979, Vol. 15 Issue (1): 126-195    DOI:
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IN-DEPTH COMPOSITIONAL PROFILE ANALYSIS BY GLOW DISCHARGE EMISSION SPECTROSCOPY AND ITS APPLICATION TO SURFACE COATING ANALYSIS OF CERTAIN MOLYBDENUM ALLOY SHEET
Xu Shengmei;Zhang Gongzhu;Zhang Hongdu;Yu Bo;Wang Shumei Institute of Metal Research; Academia Sinica
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Xu Shengmei;Zhang Gongzhu;Zhang Hongdu;Yu Bo;Wang Shumei Institute of Metal Research; Academia Sinica. IN-DEPTH COMPOSITIONAL PROFILE ANALYSIS BY GLOW DISCHARGE EMISSION SPECTROSCOPY AND ITS APPLICATION TO SURFACE COATING ANALYSIS OF CERTAIN MOLYBDENUM ALLOY SHEET. Acta Metall Sin, 1979, 15(1): 126-195.

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Abstract  An attempt has been made to use glow discharge as a light source for emis-sion spectroscopy to in-depth analysis of metal surface on a quantitative basis.According to the general theory of the cathode sputtering and low-pressure dischar-ge, a formula of working curve for spectrographic analysis corrected with currentstrength is given as: (I_j)_a=k(ε_j)_aAq_a(C_j)_awhere the subscripts "j" and "a" refer to a particular element "j" in a sample "a";"I" is the line intensity of element "j"; "ε", the excitation efficiency is a functionof the effective cross section of an atom colloided by electrons, the electron con-centration and the velocity distribution of an electron; "c", the weight percentageof elements; "A", the current strength; "q", the sputtering rate and "k" a constant. Experimental results show that under constant electrical potential and gas pres-sure, the working curves of pure Fe, Cr, Ni, Cu, Zn and the Fe, Cr, Ni, Cu, Znin Fe-Cr, Ni-Cr, Cu-Zn alloys respectively are in complete coincidence after tak-ing into account of the correction of current strength. Thus, the excitation effi-ciency appears to be solely characteristic for a particular element and is independentof the chemical composition of the sample. Moreover, the matrix effect has beenfound to be negligible in the glow discharge source after current correction. Basedon the above results, a new technique for spectrographic quantitative in-depth analy-sis of metal surface with a pure metal as a standard has been adopted for the de-termination of the composition of a B-SiTi-SiB coating on a molybdenum alloysheet. The results are in good agreement with those obtained by electron probe,X-ray diffraction and metallographic observations. The total thickness analyzed bythis technique is capable of being from a few micrometers up to ten or more mi-crometers and the depth resolution as estimated may be 2-3 micrometers.
Received:  18 January 1979     
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