Abstract
Among the high entropy or complex concentrated alloys (HEAs/CCAs), one type of system is commonly based on CoCrFeNi, which as an equiatomic quaternary alloy that forms a single phase FCC structure. In this work, the effect of Sn in an equiatomic quinary system with CoCrFeNi is shown to lead to a great improvement in hardness and resistance to tribocorrosion. The addition causes a phase transition from a single FCC phase in CoCrFeNi to dual phase in CoCrFeNiSn with an Ni-Sn intermetallic phase, and a CoCrFeNi FCC phase. The presence of both the hard intermetallic and this ductile phase helps to resist crack propagation, and consequent material removal during wear. In addition, the high polarization resistance of the passive film formed at the surface and the high corrosion potential of the Ni-Sn phase contribute to preventing chloride corrosion attack during corrosion testing. This film is tenacious enough for the effect to persist under tribocorrosion conditions.
Highlights
Metals 2021, 11, 13. https://dx.doi.org/Development of the tribocorrosion properties of materials is essential to meet the needs of a number of advanced applications, for example, biodiesel engines, pipe conveyor, and marine energy devices [1,2,3,4,5]
Many kinds of alloys may be selected for use in general tribocorrosion conditions, including High-Strength Low-Alloy steels (HSLA), stainless steels, CoCrMo alloys, and Ti alloys [2,6,7,8]
Tribocorrosion tests on AISI 304 stainless steel in 0.5 M NaCl solution showed good correlation between the coefficient of friction and the total material loss, and the regrowth of the oxide film which takes place indicates it is feasible that such an alloy could show a lubricating ability [7]
Summary
Metals 2021, 11, 13. https://dx.doi.org/Development of the tribocorrosion properties of materials is essential to meet the needs of a number of advanced applications, for example, biodiesel engines, pipe conveyor, and marine energy devices [1,2,3,4,5]. The principal material requirements that apply in such areas are a high potential to resist both corrosion and wear [1,5], as under service materials will be frequently exposed to chemically corrosive fluids (possibly under flow) and the friction load from wear interaction. The action of this combination of conditions can lead to increased damage at the material surfaces compared to either effect alone, and can lead to critical risks to human life and economy [1,5].
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