Micromechanical and tribological properties of nanocrystalline coatings of iron-tungsten alloys electrodeposited from citrate-ammonia solutions
Bobanova, Zh.I. × Dikusar, A.I. Cesiulis, H. Celis, Jean-Pierre Tsyntsaru, N.I. Prosycevas, I. #
Russian Journal of Electrochemistry vol:45 issue:8 pages:895-901
The correlation between the composition, morphology, and properties of Fe-W alloy coatings containing up to 29 at % tungsten was investigated by means of scanning electron microscopy, X-ray diffraction analysis, and the wear resistance and nanohardness measurements. The coatings were deposited from the citrate-ammonia bath at a direct current, the current densities were ranged from 10 to 100 mA/cm(2). It is shown that, in contrast to metallurgical iron, the Fe-W coatings are nanocrystalline (amorphous, the grain size is 3.0-4.0 nm). This structure of alloys allows us to produce the coatings with a nanohardness of similar to 13 GPa. which is comparable to the electrolytic chromium coatings. The study of wear resistance of thus obtained coatings reveals their oxidation in the course of dry friction; as a result, the oxygen content in the debris increases by 2-3 times, and the wear volume due to the tribooxidation exceeds that tor similar hard Co-W and electrolytic chromium coatings.