Abstract
Ion backscattering at MeV energies, coupled with nuclear reaction analysis, has been used to determine quantitatively the composition of complex corrosion films produced by the exposure of 316 stainless−steel specimens to a variety of alkaline solutions. The oxygen content as a function of depth, up to about 2 μ, and the trace heavy metal content were determined by helium backscattering at 2.9 MeV. The lithium content was measured by means of the Li7 (p,α) reaction at Ep = 3 MeV, with a calibration achieved by comparison with LiNbO3. It is shown how much more valuable such ion−beam techniques become when combined with microscopic examination using SEM, EDAX, and optical methods. In this way, for example, the variation in composition with depth has been correlated with oxide thickness. The advantages of this form of analysis for other corrosion problems will be described.
Published Version
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