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Deposition of cationic yttrium on heterogeneous surfaces
Author(s) -
Davis S. J.,
Watts J. F.,
Hazell L. B.
Publication year - 1994
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740210625
Subject(s) - yttrium , cathodic protection , deposition (geology) , x ray photoelectron spectroscopy , materials science , substrate (aquarium) , metallurgy , hematite , anode , chemistry , analytical chemistry (journal) , chemical engineering , electrode , oxide , environmental chemistry , geology , paleontology , oceanography , engineering , sediment
The cathodic deposition of yttrium on iron and steel surfaces is known to improve the bond strength of joints treated in such a manner. This work explores the effect of large and small heterogeneities on the spatial distribution of the deposited species. Two systems are investigated: 98% iron with micrometre‐scale inclusions, and a micro‐hardness indentation on gold‐coated iron. In the former case yttrium is identified (by XPS and SAM) to have been deposited in two concentration regimes: close to the inclusion (the cathodic area) the concentration is higher than elsewhere, and also contains iron produced by back‐deposition. At the identation the iron substrate is exposed at the corners to provide the prerequisite anodic site, cathodic deposition of yttrium is then observed both within the identation and on the undamaged gold surface at a lower concentration. The provision of spatially resolved analytical information by SAM, time‐of‐flight SIMS and imaging XPS enables the interrelationship of microstructural features and extent of cathodic deposition to be readily appreciated.