Comparative studies on corrosion and tribological performance of multilayer hard coatings grown on WC-Co hardmetals

Derakhshandeh, Mohammad Reza; Eshraghi, Mohamad Javad; Jam, Alireza; Rajaei, Hosein; Fazili, Ali

doi:10.1016/j.ijrmhm.2020.105339

Cited by 12 publications

(4 citation statements)

References 46 publications

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“…It was found that the hardness gradient in the bonding domain is large, which is a typical characteristic of the hardness distribution of the spray welding layer. This is the result of the sprayed liquid alloy and the matrix, which diffuse and penetrate each other, and the C element in the alloy power plays a solid solution strengthening effect [38,39]. Besides, as the content of Fe-based amorphous alloys increases, the microhardness of the spray welding layer increases, and has a great relationship with the microstructure.…”

Section: Resultsmentioning

confidence: 99%

Microscopic Characteristics and Properties of Fe-Based Amorphous Alloy Compound Reinforced WC-Co-Based Coating via Plasma Spray Welding

Wang

et al. 2020

Processes

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Plasma spray welding, as one of the material surface strengthening techniques, has the advantages of low alloy material consumption, high mechanical properties and good coating compactness. Here, the Co alloy, WC and Fe-based amorphous alloy composite coating is prepared by the plasma spray welding method, and the coating characteristics are investigated. The results indicate that the coatings have a full metallurgical bond in the coating/substrate interface, and the powder composition influences the microstructures and properties of the coating. The hardness of coatings increases with the mass fraction of the Fe-based amorphous alloy. The spray welding layer has a much higher wear resistance compared with the carbon steel, and the Fe-20 exhibits a superior wear resistance when compared to others. The results indicate that the amorphous alloy powders are an effective additive to prepare the coating by plasma spray welding for improving the wear resistance of the coating.

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Section: Resultsmentioning

confidence: 99%

Microscopic Characteristics and Properties of Fe-Based Amorphous Alloy Compound Reinforced WC-Co-Based Coating via Plasma Spray Welding

Wang

et al. 2020

Processes

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“…Mult layer coat ngs can be d st ngu shed by the r repeat ng layers, usually, a harder layer followed by a softer layer as shown n F g. 2d. The mult layer arch tecture can be composed of ceram c and metall c layers, or two d fferent ceram c layers [66][67][68]. The tr bolog cal performance of mult layer coat ng depends on several aspects as shown n F g. 3a.…”

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confidence: 99%

Smart Tribological Coating

Arjunan

Baroutaji

Robinson

et al. 2022

Encyclopedia of Smart Materials

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“…Furthermore, Figure 8 c shows that small accumulated corroded products occurred preferentially in the binder islands and in the pores of the microstructure. The binder islands can act as a starting point for corrosion, because they are the most exposed phase, and the pores may lead to faster electrolyte penetration into the microstructure, causing localized attacks [ 40 , 41 ].…”

Section: Resultsmentioning

confidence: 99%

Comparative Study of Corrosion Behaviors of WC-NiMo and WC-Co Cemented Carbides

et al. 2023

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In this paper, the influence of a nickel binder metal and molybdenum carbide as an additional alloying element on the microstructure and corrosion behavior of WC-based cemented carbides, processed by conventional powder metallurgy, was studied, and a comparison with conventional cemented carbide (WC-Co) was carried out. The sintered alloys were characterized, before and after corrosive tests, by analyses using optical microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. The corrosion resistance of the cemented carbides was investigated by open circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy in a 3.5 wt.% NaCl solution. The WC-NiMo cemented carbides showed microstructures similar to those of WC-Co; however, pores and binder islands were observed in the microstructures. The corrosion tests showed promising results, the WC-NiMo cemented carbide showed superior corrosion resistance and higher passivation capacity than the WC-Co cemented carbide. The WC-NiMo alloy showed a higher EOC ≈−0.18 V vs. Ag|AgCl|KCl3mol/L than the WC-Co (EOC≈−0.45 V vs. Ag|AgCl|KCl3mol/L). The potentiodynamic polarization curves showed lower current density values throughout the potential range for the WC-NiMo alloy, and it was observed that Ecorr was less negative (≈−0.416 V vs. Ag|AgCl|KCl3mol/L) than for WC-Co (≈−0.543 V vs. V vs. Ag|AgCl|KCl3mol/L). The EIS analysis confirmed low rate corrosion of WC-NiMo associated with the formation of a passive thin layer. This alloy showed a higher Rct (1970.70 Ω).

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Comparative studies on corrosion and tribological performance of multilayer hard coatings grown on WC-Co hardmetals

Cited by 12 publications

References 46 publications

Microscopic Characteristics and Properties of Fe-Based Amorphous Alloy Compound Reinforced WC-Co-Based Coating via Plasma Spray Welding

Microscopic Characteristics and Properties of Fe-Based Amorphous Alloy Compound Reinforced WC-Co-Based Coating via Plasma Spray Welding

Smart Tribological Coating

Comparative Study of Corrosion Behaviors of WC-NiMo and WC-Co Cemented Carbides

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