Tribological and Corrosion Properties of Iron-Based Alloys

Abstract

Corrosion is responsible for industrial maintenance and industrial accidents costs. A helpful way to prevent corrosion is to develop advanced materials with highly anti-corrosive properties. The electrodeposition is one of the most attractive methods for obtaining these materials. This work deals with evaluation of the tribological and corrosion behaviour of electrodeposited Fe-W and Fe-W-P alloys. Electrodeposits were obtained from 4 different baths and were characterized by means of scanning electron microscopy; X-ray dispersive energy spectroscopy; X-ray diffraction spectroscopy. The hardness was determined by Micro-indentation carried out at normal forces varying from 98 mN up to 980 mN with a loading rate of 1961 mN/min. A ball-disc tribometer was used to study the tribological properties at 90 °C. A diamond indenter, having a radius of 100 µm, was used to carry the scratch test. Corrosion behaviour was studied using polarization and electrochemical impedance spectroscopy technique. It was investigated that in all cases Fe-W and Fe-W-P alloy coatings exhibit greater micro-hardness than the stainless steel substrate. The amorphous-like ternary Fe-W-P alloy coatings demonstrate higher wear and corrosion resistance and lower friction coefficient compared to binary Fe-W alloy coating.

Nanocrystalline Electrodeposited Fe-W/Al2O3 Composites: Effect of Alumina Sub-microparticles on the Mechanical, Tribological, and Corrosion Properties

“…Noticeably, the R ct obtained for Fe-W coatings electrodeposited from glycolate-citrate electrolyte and tested in chloride medium can be roughly comparable to other Fe-containing deposits described in literature: Fe-W alloy electrodeposited from citrate bath and tested in sulfate-chloride medium (380.7 Ω cm 2 ) (Vernickaite et al, 2015), Ni-Fe-W alloy tested in similar corrosion medium (207.0 Ω cm 2 ) (Sriraman et al, 2007) and with Ni-Fe/Al 2 O 3 composite in sodium sulfate (~250 Ω cm 2 ) (Starosta and Zielinski, 2004); whereas the corrosion resistance of Co-W and Ni-W alloys in neutral mediums is much higher, i.e., 1,200 and 6,770 Ω cm 2 , respectively (Sriraman et al, 2007; Vernickaite et al, 2016). Taking this into account, and the small variations in corrosion currents obtained for investigated Fe-W composite coatings, one could suspect the detrimental and prevalent effect of Fe dissolution from the coating.…”

Effect of Electrodeposition Parameters on the Composition and Surface Topography of Nanostructured Coatings by Tungsten with Iron and Cobalt

“…Eurasian Chemico-Technological Journal 22 (2020) [19][20][21][22][23][24][25] Analysis of the coatings composition indicates that, in addition to the main components (Fe, W), they contain some amount of oxygen. It should be stated uneven distribution of the alloy components on the surface of the covers deposited at a DC mode: on the hills of the relief there is a high content of metals; in the valleys, the oxygen concentration is rather high.…”

“…The presence of the Co 7 W 6 , Fe 7 W 6 phases detected in the Fe-Co-W deposits reflects the competition between the alloying metals reducing. It is well known that cobalt, in contrast to tungsten and iron, is characterized by a hexagonal crystal lattice, therefore, the co-reduction of metals contributes to the formation of amorphous structures [25]. Let's note that the formation of the Co 7 W 6 and Fe 7 W 6 phases is a prerequisite for increasing the microhardness of the coatings.…”

Research into influence of the electrolysis modes on the composition of galvanic Fe-Co-Mo coatings

“…Article [14] described coatings based on iron Fe-W and Fe-W-P obtained from the electrolytes of different composition, which demonstrate high wear stability and corrosion resistance. It is also noted that the friction coefficient of amorphous ternary alloys Fe-W-P is less than that of the binary coatings Fe-W.…”