Answers are grounded in this paper and cite their sources.
Amperostatic coulometry was applied for the thickness measurement of Sn-Ag hot dip coatings, which comprise an extended Sn-Cu interdiffusion layer. Complementary measurements, notably weight loss, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, X-ray fluorescence (XRF), and dynamic secondary ion mass spectroscopy were performed in order to obtain a better interpretation of the coulometry results. Based on the experimental results presented in this article, the three potential changes observed during coulometry measurements are ascribed to ( i ) the entire dissolution of pure Sn, ( ii ) the formation of a CuCl salt layer, and ( iii ) the surface passivation. The measurement of the pure Sn mass is well reproducible despite strong coating thickness variations detected by XRF. Several experimental problems, in particular, a coating undercutting, hamper the determination of the Sn mass in the intermetallic Sn-Cu layer.
No takes yet. Share an insight, caveat, or question.
Scheuerlein et al. (2004) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: