Differential positron annihilation spectroscopy in nondestructive testing of thin chromium coatings on copper

The differential positron annihilation spectroscopy (DPAS) is used for the nondestructive investigation of thin metallic coatings on metallic substrates when the defectiveness of the coating applied is judged from the difference between the spectra of the individual substrate and the substrate cover...

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Bibliographic Details
Published in:Protection of metals and physical chemistry of surfaces 2010-09, Vol.46 (5), p.620-624
Main Authors: Bardyshev, I. I., Kotenev, V. A., Aleshin, N. P., Tsivadze, A. Yu
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Chromium
Clusters
COATINGS
Copper
Corrosion and Coatings
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Investigation Methods for Physicochemical Systems
Materials Science
Metallic Materials
MICROSTRUCTURES
Nanostructure
NONDESTRUCTIVE TESTS
Positron annihilation
Positron annihilation spectroscopy
POSITRONS
Tribology
VOIDS
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Summary:The differential positron annihilation spectroscopy (DPAS) is used for the nondestructive investigation of thin metallic coatings on metallic substrates when the defectiveness of the coating applied is judged from the difference between the spectra of the individual substrate and the substrate covered with the coating. Using the DPAS angular correlation curves of positron annihilation radiation (ACAR), the presence of nanoscale void clusters in the X-ray amorphous galvanic chromium coatings with a weight thickness of 9.15 mg/cm 2 (1.3 μm) is determined on the copper substrate. The ACAR curves of the coatings have a complex structure compared to those of the specimens of Cr 3 C 2 and Cr 23 C 6 carbide powders and involve a narrow peak with a half width FWHF = 3 mrad and an intensity about 2% assigned to void clusters with a size of 0.86 nm, which act as positron traps, in the coating.
ISSN:2070-2051
2070-206X
DOI:10.1134/S2070205110050217