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Parida, Sanjit Kumar
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article
Characterization and hardness of Co-P coatings obtained from direct current electrodeposition using gluconate bath
Abstract
<p>Direct current electrodeposition of Co-P alloy coatings were carried out using gluconate bath and they were characterized by employing techniques like XRD, FESEM, DSC and XPS. Broad XRD lines demonstrate the amorphous nature of Co-P coatings. Spherical and rough nodules are observed on the surface of coatings as seen from FESEM images. Three exothermic peaks around 290, 342 and 390°C in DSC profiles of Co-P coatings could be attributed to the crystallization and formation of Co<sub>2</sub>P phase in the coatings. As-deposited coatings consist of Co metal and oxidized Co species as revealed by XPS studies. Bulk alloy P (P<sup>δ-</sup>) as well as oxidized P (P <sup>5+</sup>) are present on the surface of coatings. Concentrations of Co metal and P<sup>δ-</sup> increase with successive sputtering of the coating. Observed microhardness value is 1005 HK when Co-P coating obtained from 10 g L<sup>-1</sup> NaH<sub>2</sub>PO<sub>2</sub> is heated at 400°C that is comparable with hard chromium coatings.</p>