Journal
SURFACE & COATINGS TECHNOLOGY
Volume 206, Issue 6, Pages 1351-1354Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2011.08.058
Keywords
Iridium coating; Electrodeposition; Molten salt; Rhenium
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Compact and smooth iridium coating was obtained on the surface of the rhenium substrate by electrodeposition from molten salts of chlorides at the temperature of 600 degrees C in the air. The deposition rate is about 25 mu m/h at cathodic current density of 25 mA/cm(2). The iridium coating has a columnar structure with preferential growth orientation of < 111 >. The coating/substrate interface exhibits excellent adherence with no evidence of delamination, cracks, or other defects. No obvious diffusion layer is found within the as-deposited coating. The microhardness of the coating is 442 kg/mm(2) and the bond strength between the coating and substrate is higher than 16 MPa. (C) 2011 Elsevier B.V. All rights reserved.
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