Abstract
The present work investigates the corrosion resistance of as-cast FeCoCrNiMn high-entropy alloy in borate buffer solution. Compared with 304 and 316L stainless steels steel, as-cast FeCoCrNiMn high-entropy alloy exhibited excellent passivation ability. This should be attributed to homogenization of alloying elements. Highly corrosion-resistant elements in as-cast FeCoCrNiMn alloys, for example, Cr, Co and Ni, could promote the formation of protective passive film in borate buffer solution. Moreover, combined effect of high mixing entropy and sluggish diffusion also could improve the corrosion resistance. The formation mechanism of the passive films on the surface of as-cast FeCoCrNiMn alloys satisfied the point defect model.
Highlights
Yeh et al [1] firstly proposed a very novel design concept called high entropy alloys (HEAs) which is a multicomponent alloy containing five or more metallic elements with nearly equiatomic ratios and at the same time can stabilize as a single-phase solid solution [2]
Xiang et al [7] fabricated FeCoCrNiMn high entropy alloys by the laser melting deposition technique and found that obtained FeCoCrNiMn HEAs showed more homogeneous element distribution than that obtained by casting technique
We evaluate the corrosion resistance of FeCoCrNiMn HEAs by electrochemical experiment in borate buffer solution
Summary
Yeh et al [1] firstly proposed a very novel design concept called high entropy alloys (HEAs) which is a multicomponent alloy containing five or more metallic elements with nearly equiatomic ratios and at the same time can stabilize as a single-phase solid solution [2]. George et al [3] found that FeCoCrNiMn HEAs exhibited excellent strength, ductility and work hardening rate in cryogenic temperature due to earlier forming nanotwins. Xiang et al [7] fabricated FeCoCrNiMn high entropy alloys by the laser melting deposition technique and found that obtained FeCoCrNiMn HEAs showed more homogeneous element distribution than that obtained by casting technique. This technique induced high strength and ductility of FeCoCrNiMn high entropy alloys. Ye et al [9] found that the FeCoCrNiMn HEA coating obtained by laser surface alloying exhibited lower corrosion rate than 304 stainless steel in 3.5 wt% NaCl solution and 0.5 M sulfuric acid. We evaluate the corrosion resistance of FeCoCrNiMn HEAs by electrochemical experiment in borate buffer solution
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