Study of corrosion resistance of high entropy alloy Al0,5CoCrFeNi1,6Ti0,7 in sea water

High-entropy alloys (HEAs) are a relatively new type of alloys and interest is constantly growing. Unlike traditional alloys based on one or two main components, HEAs include five or more components in close to equimolar ratios. It is known that a number of HEAs exhibit a high level of useful properties. Such alloys combine high strength and ductility, increased fatigue resistance, high hardness and wear resistance, and high thermal stability. The development of new compositions and the study of the properties of the obtained high-entropy alloys are currently topical materials science problems. The creation of corrosion-resistant HEAs and the study of their behavior in aqueous solutions of alkalis, acids and salts is justified by the possibility of applying coatings on products operated in aggressive aqueous solutions, including sea water. This work is devoted to the study of the corrosion resistance of the high-entropy alloy Al0,5CoCrFeNi1,6Ti0,7 in an aqueous solution - an analogue of sea water for 93 days in order to determine the long-term stability of this alloy when operating under the conditions of the Northern Sea Route. It is shown that this alloy has a complex multiphase structure, which does not worsen the corrosion resistance when operating in sea water. HEAs Al0,5CoCrFeNi1,6Ti0,7 demonstrates the change in mass according to the parabolic law. During the entire test period, the weight gain was about 2.7 mg/cm2. Most of the surface of the investigated alloy after testing is covered with a thin oxide film; the composition of the film is dominated by oxides of titanium, chromium and nickel.