Influence of Microstructure and Passive Film on the Corrosion Behavior of CoCrFeMnNi High-Entropy Alloy Prepared by Different Cooling Methods in a Simulated Alkaline Soil Solution
Source abstract
Abstract
The influence of microstructure and passive film on the corrosion behavior of CoCrFeMnNi high-entropy alloy (HEA) prepared by different cooling methods in alkaline soil simulation solution was investigated by electrochemical measurements, immersion test, atomic force microscopy, and x-ray photoelectron spectrometry. The results show that the corrosion resistance of the HEA decreases with decreasing cooling rate, and the water-cooled sample exhibits the best anti-corrosion property. The corrosion behavior of the HEA is closely related to σ-phase, grain size, oxide, and passive film. The micro galvanic corrosion effect between grain boundary (GB) and inner-grain reduces as the grain size increases. σ-phase distributed at GBs and the oxide increases the susceptibility to pitting corrosion. The increasing number of σ-phase significantly reduces the corrosion resistance of HEA. And pits around GB regions and σ-phase are attributed to the selective dissolution of Fe, Co, and Cr elements. The pits generated in the interior of σ-phase are mainly caused by the selective dissolution of Cr. The passive film of the water-cooled sample contains higher contents of Cr2O3, Fe2O3, and bound water, and lower contents of Mn oxide and FeO, which has better protection ability to the matrix. Moreover, a dense passive film is formed on the water-cooled sample as indicated by the fact that the donor density (ND) of passive film on the furnace-cooled sample is approximately 1.65 times that of water-cooled sample.
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Research context
OpenAlex topics: High Entropy Alloys Studies · High-Temperature Coating Behaviors · Additive Manufacturing Materials and Processes
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References (68)
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