The Microstructure And The Corrosion Properties Of The High-entropy Alloy With The Addition Of Sn Element

FeCoNiCuSn_x, FeCoNiMnCuSn_x, FeNiCuMnTiSn_xseries of high-entropy alloyswere prepared firstly. Then the crystal structure and surface morphology andelectrochemical corrosion behavior of series prepared high-entropy alloys wereinvestigated by XRD, SEM, Potentiodynamic Polarization Test, ElectrochemicalImpedance Spectroscopy Test and Immersion Corrosion Analysis methods in3.5wt.%NaCl solution,5wt.%HCl solution,5wt.%NaOH solution. XRD resultsshow that most of the alloy series present a simple face-centered cubic structure anda slight change with changes of Sn content. The microstructure of the alloy seriesshowed a typical dendritic structure, and with Sn element content increasemicrostructure morphology and grain size changes. The elements in the alloy are notevenly distributed, such as Cu has segregation phenomenon. The electrochemicaltests and immersion corrosion results showed that: the corrosion resistance ofFeCoNiCuSn_xFeCoNiMnCuSn_xand FeNiCuMnTiSn_xseries alloy in3.5wt.%NaCland5wt.%HCl solution are better than the304stainless steel. However, in5wt.%NaOH solution the corrosion resistance of the FeCoNiCuSn_xFeCoNiMnCuSn_xandFeNiCuMnTiSn_xalloy series is far better than the304stainless steel.