Microstructure and Electrochemical Behavior of Fe-Based Amorphous Metallic Coatings Fabricated by Atmospheric Plasma Spraying

Abstract

A Fe 48 Cr 15 Mo 14 C 15 B 6 Y 2 alloy with high glass forming ability (GFA) was selected to prepare amorphous metallic coatings by atmospheric plasma spraying (APS). The as-deposited coatings present a dense layered structure and low porosity. Microstructural studies show that some nanocrystals and a fraction of yttrium oxides formed during spraying, which induced the amorphous fraction of the coatings decreasing to 69% compared with amorphous alloy ribbons of the same component. High thermal stability enables the amorphous coatings to work below 910 K without crystallization. The results of electrochemical measurement show that the coatings exhibit extremely wide passive region and relatively low passive current density in 3.5% NaCl and 1 mol/L HCl solutions, which illustrate their superior ability to resist localized corrosion. Moreover, the corrosion behavior of the amorphous coatings in 1 mol/L H 2 SO 4 solution is similar to their performance under conditions containing chloride ions, which manifests their flexible and extensive ability to withstand aggressive environments.

Thermal Conductivity and Wear Behavior of HVOF-Sprayed Fe-Based Amorphous Coatings

“…With regard to Fe-based amorphous coatings extensive research has been focused on their wear and corrosive behaviour [7][8][9][10][11][12][13]. Little attention has been paid to the thermal transport behaviour of Fe-based amorphous coatings because of their metastable state.…”

Effect of feedstock particle sizes on wear resistance of plasma sprayed Fe-based amorphous coatings

“…Among the numerous spray technologies, air plasma spray (APS), which could provide extremely high plasma flame temperature (8000-10,000°C) and ultrahigh cooling rate (10 5 -10 7 K/s), is especially suitable for fabricating amorphous coatings [8]. Besides, APS is easy and flexible to operate as well as low in cost [9].…”

Sliding wear behavior of Fe50−xCr15Mo14C15B6Erx (x=0, 1, 2at%) bulk metallic glass

“…But recently, there has been an increasing interest in the synthesis of iron-based amorphous alloy coatings based on bulk glass-forming compositions to take advantage of their excellent wear properties [12][13][14][15][16]. Most of the coatings show potential applications in industrial fields, such as oil and gas production, refining, nuclear power generation, shipping, earth excavation, drilling, tunnel-boring, and in other applications [17]. Moreover, micro gears fabricated from bulk metallic glasses exhibited superior wear properties [18][19][20] and research currently progresses on a trajectory of improving wear and corrosion properties.…”