Corrosion Resistance And Degradation Properties Of Fesibpcu Nanocrystalline Alloy

Due to the excellent soft magnetic properties,such as high saturation magnetization,low coercivity and core losses,Fe-based amorphous alloy and nanocrystalline alloy have been widely used as magnetic cores of distributioin transformers.However,when used as magnetic cores materials,Fe-based amorphous alloy and nanocrystalline alloy might suffer from the corrosion because they are used in the working environment containing Cl^-.FeSiB amorphous alloy has been commercially produced,and FeSiBPCu nanocrystalline alloy has high saturation magnetizations,which has a great potential in the field of distribution transformers.Therefore,the corrosion mechanism of Fe_79.5-xSi_9.5B₁₁Cr_x amorphous alloys and the corrosion resistance of Fe₈₁Si₂B₁₀P₆Cu₁ nanocrystalline alloys were studied in the work.In addition,FeSiBPCu nanocrystalline alloys have high Fe content,which provides a possibility for its application in the field of dye wastewater degradation.Thus,the degradation properties of alloys was also discussed.The research work mainly includes:1.The mechanism of the improvement of the corrosion resistance of Fe_79.5-xSi_9.5B₁₁Cr_x amorphous alloys by Cr addition is investigated by the analysis of crystallization behavior and XPS analysis.It is found that Cr element is enriched in the oxide film of amorphous alloy and result in the protection improvement of oxide film in Cr-containing alloys,which is the reason that the corrosion resistance is enhanced by Cr addition.Besides,with Cr content from 5 at%to 7 at%,the corrosion resistance of alloys was enhanced abruptly due to the better stability of amorphous structure.2.The corrosion resistance of Fe₈₁Si₂B₁₀P₆Cu₁ nanocrystalline ribbons was studied by means of SEM,TEM and electrochemical methods.It is found that the microstructure have a great influence on the corrosion resistacne of Fe₈₁Si₂B₁₀P₆Cu₁ nanocrystalline alloy in 0.1 M NaCl solution.The corrosion resistance of Fe₈₁Si₂B₁₀P₆Cu₁ nanocrystalline alloy,multi-phase nanocrystalline alloy and amorphous alloy decreased in turn.In addition,the corrosion resistance of nanocrystalline alloys improves gradually with the the crystalline volume fraction of nanocrystalline alloy increases.3.The degradation behavior of methylene blue solution by Fe₈₁Si₂B₁₀P₆Cu₁ nanocrystalline ribbons was studied by ultraviolet spectrophotometer.It is found that the nanocrystalline ribbons can effectively degrade the methylene blue solution based on the Fenton-like reaction,and the degradation efficiency is 1.7 times that of the Fe₇₈Si₉B₁₃ amorphous ribbons.The microstructure of the alloy has a significant influence on its degradation performance.The degradation efficiency of Fe₈₁Si₂B₁₀P₆Cu₁ amorphous ribbons is slightly higher than that of nanocrystalline alloys,and the degradation properties of amorphous ribbons and nanocrystalline ribbons are superior to that of the multi-phase nanocrystalline alloy.Moreover,The temperature and pH value of methylene blue solution have a great effect on the degradation efficiency of Fe₈₁Si₂B₁₀P₆Cu₁ alloy.As the temperature increases,the degradation efficiency of the alloy increases,while the greater the pH value,the lower the degradation efficiency of the alloy,and alloys lose the degradation ability in neutral and weak alkaline solutions.The Fe₈₁Si₂B₁₀P₆Cu₁ nanocrystalline ribbons have good repeatability and can be reused for 4 times.4.Ball milling method was used to grind the FeSiBPCu nanocrystalline ribbons into powders,and the degradation behavior of the nanocrystalline powders for different dyes was studied.The FeSiBPCu nanocrystalline powder can degrade the azo dye Acid Orange 7efficiently when used as a zero valent metal,and the degradation efficiency is higher than that of commercial reduced iron powder.The methylene blue solution can be degraded efficiency by the FeSiBPCu nanocrystalline powder based on Fenton-like reaction,and the degradation efficiency is higher than that of commercial reduced iron powder.Moreover,the smaller the particle size,the higher the degradation efficiency of the nanocrystalline powders for Acid Orange 7.The concentration and pH value of Acid Orange 7 have an effect on the degradation performance of nanocrystalline powder.As the concentration of the solution increases,the pH value increases,the degradation performance of the powder decreases,but the decline trend is very small.It is interesting tha the powder can still degrade the Acid Orange 7 efficiently which is neutral and weak alkaline.The FeSiBPCu nanocrystalline powders have good repeatability and can be reused for 3 times without any treatment.