Micromechanical and tribological properties of nanocrystalline coatings of iron-tungsten alloys electrodeposited from citrate-ammonia solutions |
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Authors: | Zh. I. Bobanova A. I. Dikusar H. Cesiulis J. -P. Celis N. I. Tsyntsaru I. Prosycevas |
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Affiliation: | 1. Institute of Applied Physics, Academy of Sciences of Moldova, ul. Akademicheskaya 5, Chisinau, MD-2028, Republic of Moldova 2. Vilnius University, ul. Naugarduko 24, Vilnius, LT-03225, Lithuania 3. Catholic University Leuven, Kasteelpark Arenberg 44, Leuven, Heverlee, B-3001, Belgium 4. Institute of Physical Electronics, Kaunas University of Technology, ul. Savanoriu 271, Kaunas, LT-50131, Lithuania
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Abstract: | 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/cm2. 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 ~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 for similar hard Co-W and electrolytic chromium coatings. |
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