Abstract

Although titanium alloy technology in general is advancing rapidly, the control analysis of these alloys has not reached the degree of speed and perfection possible with corresponding alloys of aluminum, magnesium, and steel. Thus far, nearly all reliable methods for titanium have necessitated reducing the samples to chips and dissolving the metal prior to either chemical or spectrochemical analysis. These procedures are time consuming and costly. Most attempts to analyze titanium alloys by direct metal excitation have resulted in abnormally high errors frequently attributed to metal segregation. Results of experiments in this laboratory, however, indicate that acceptable precision can be obtained on a typical commercial alloy by direct excitation if certain precautionary techniques are employed. These techniques involve (1) selection of homologous line pairs, (2) choice of a reference line close to the element line in wavelength, (3) provision for flushing the analytical gap with an inert atmosphere during excitation, and (4) use of an adequate pre-exposure period to provide an equilibrium condition during exposure. The procedural considerations described, when applied to a direct spectrographic method, can reduce errors by an order of magnitude in the case of aluminum determinations in titanium alloy. The precision obtainable provides a coefficient of variation of 0.9%.

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Appl. Opt. 44(27) 5773-5777 (2005)