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The Establishment of a Q Rating Factor for Decorative Chromium Plate by X-Ray Fluorescence

Published online by Cambridge University Press:  06 March 2019

William C. Keesaer
William C. Keesaer*
Affiliation:
Buick Motor Division, General Motors Corporation, Flint, Michigan
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Abstract

Procedures and methods employed to develop anX-ray emission spectrometer technique for determining the quality of decorative chromium plate are presented. Individual plate quality factors and their significance are discussed:

  1. 1. Plate thickness

  2. 2. Plate density

  3. 3. Plate corrosion resistance

Geometric instrumentation changes to the General Electric XRD-5S spectrometer are detailed. These alterations have made it possible to take more complete advantage of the nondestructive nature of the fluorescent method, and have also yielded an increase in useful radiation intensity of 50%.

The unsuccessful attempts to employ commercially plated Hull-cell-type test panels as “standards” are described, along with the satisfactory application of fabricated standards of vacuum vapor-deposited high-purity chromium, laminated to spectrographically pure nickel foils. The merits and limitations of the resultant “absolute purity — absolute density” standard curve are shown and are related to other measurement techniques and accelerated corrosion test data.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 3: Eighth Annual Conference on Applications of X-ray Analysis, August 12-14, 1959 , 1959 , pp. 77 - 94
Copyright
Copyright © International Centre for Diffraction Data 1959

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References

1 Kahler, Harold A., “Automotive Trim: Performance and Testing,” Products Finishing, Vol. 23, No. 7, 1959, p. 22.Google Scholar
2 Thomas, J. D. and Rouse, Stanley R., “Using the Interference Microscope for Thickness Measurements of Decorative Chromium Plating,” Plating, Vol. 42, 1955, p. 55.Google Scholar
3 Goodwin, Paul S. and Winchester, Charles L., “Continuous X-ray Measurement of Plating Thickness,” Plating, Vol. 46, 1959, p. 41.Google Scholar
4 Seyb, Edgar J., “Improved Chromium Plate,” Metal Progress, Vol. 76, No. 1, 1959, p. 113.Google Scholar