Abstract
In this study, the relationship between the nitrogen content and the corrosion resistances of non-equimolar multicomponent AlCrNbYZrN films (N = 13–49 at.%) is probed. While there was no linear relationship between nitrogen content and corrosion resistance, the results clearly show that the corrosion resistances of the films were instead determined by their nitrogen-induced porosities i.e. the less porous the sample, the higher the corrosion resistance. The 23, 30 and 37 at.% N samples were denser while the 13 at.% N sample was porous and the 49 at.% N film had an underdense nanocrystalline columnar cross section permitting the ingress of electrolyte.
Highlights
The emergence of high entropy alloys has driven an upsurge in the development of alloys containing multiple metallic elements broadly known as multicomponent alloys [1]
The morphologies of the films were studied by high-resolution scanning electron microscopy (HR-SEM) using a Zeiss Merlin instru ment
The effect of the N content on the electrochemical performance of non-equimolar AlCrNbYZrN films has been investigated in 1.0 M HCl
Summary
The emergence of high entropy alloys has driven an upsurge in the development of alloys containing multiple metallic elements broadly known as multicomponent alloys [1]. This has made it possible to design alloyed coatings with improved corrosion resistances, abrasion re sistances and mechanical properties [2]. To obtain a high corrosion resistance the thermody namic stabilities of the elements used in the alloy, the microstructure and porosity of the alloy, as well as the possibilities to form a passive layer on the surface of the alloy all need to be considered with respect to the application in question. Since the simultaneous realization of multi component alloys by Cantor et al [1] and high entropy alloys by Yeh et al [3] many new multicomponent materials with atomic level com plexities, versatile functionalities and excellent combinations of me chanical and corrosion properties have been made [4,5,6]
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