Coatings Probed by Positrons

Nielsen, B.; Hulett, L.D.; Wallace, Steven; Xu, Jun; Szeles, Csaba; Lynn, Kelvin G.; Pfau, J. P.

doi:10.1051/jp4:1995122

Cited by 1 publication

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The application of positron annihilation spectroscopy for studying the degradation of polymeric coatings has been described by several authors [1][2][3][4][5]. The results of positron annihilation lifetime spectroscopy (PALS) and Doppler broadening of the annihilation radiation (DBAR) techniques are discussed.…”

Section: Introductionmentioning

confidence: 99%

“…In poor barrier coatings larger voids will be present at the metal/coating interface that can be detected by a high value of t 3 (longest positron lifetime). The effect of water saturation on the coatings was studied by Mandani et al [3] and MacQueen et al [4] using PALS and by Nielsen et al [5] using DBAR in a positron beam system. The UV irradiation effect was studied using DBAR by Cao et al [2] and showed a significant decrease in the S parameter ascribed to the * To whom all correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of polymer/metal coating under stress using positron annihilation spectroscopy

et al. 2000

View full text Add to dashboard Cite

Abstract-Positron annihilation spectroscopy (PAS) has proven to be a very useful technique for, e.g., the study of defects in materials and the characterization of polymer free-volume. Positron lifetime, Doppler broadening of the annihilation radiation (characterized by the so-called S parameter) and angular correlation of annihilation radiation (ACAR) are the techniques used mostly. In the last few years these techniques have been extended to the study of physical defects at the atomic level of coating systems. These studies show that positron lifetime and the S parameter can monitor the degradation of the coating due to environmental changes (water or UV exposure). The present work is focused on the behavior of coatings under external stresses as studied by PAS. Results of positron annihilation measurements (before and after stretching) on interstitial free (IF) steel coated with epoxy using the Delft variable energy positron (VEP) beam facility are discussed.

show abstract