XPS and GDOES Characterization of Porous Coating Enriched with Copper and Calcium Obtained on Tantalum via Plasma Electrolytic Oxidation

Figure 4

Relative light intensities of tantalum, phosphorus, calcium, copper, oxygen, and nitrogen of PEO coating formed on tantalum obtained by GDOES method. The first 20 s was recorded with higher acquisition frequency and no smoothing with equal spacing was applied; this is why the further derivatives look more noisy in this first part.