Study On The Influence Of Magnetron Sputtering CrAlSiN Coating On The Corrosion And Wear Properties Of Electrical Pure Iro

Electrical pure iron is widely used as a raw material for manufacturing various electronic components due to its excellent soft magnetic properties,playing a crucial role in the working process of electronic components.However,with the increasingly extreme working conditions of marine equipment,electrical pure iron with poor corrosion and wear performance clearly cannot meet long-term working requirements and requires surface treatment.In this paper,a single CrAlSiN anti-corrosion and wear-resistant coating and a nitriding/PVD dual phase composite coating were prepared on the surface of electrical pure iron by magnetron sputtering technology through a single variable research method.The effects of N₂ flow rate,Si target power,and pre-nitriding treatment on the microstructure,phase structure,mechanical properties,corrosion performance,and wear performance of the coating in air and 3.5wt.%Na Cl environments were studied using SEM,XRD,XPS,nanoindentation,microhardness tester,neutral salt spray box,electrochemical workstation,and ball disc friction and wear testing machine.The test results of coatings under different N₂ flow rates indicate that.As the N₂flow rate increases,the main phase of the coating changes from Cr₂N→CrN→Cr₂N;The compound of Si is amorphous;The coating structure first becomes loose and then gradually densifies;The hardness of the coating increased from 6.91 Gpa to 20.2 Gpa;The corrosion resistance of the coated samples is better than that of pure electric iron,and the corrosion resistance of the coating gradually decreases with the increase of N₂flow rate;The wear resistance of the coating first increases and then decreases with the increase of N₂ flow rate,and the N-10 coating has the lowest friction coefficient（0.66）and wear rate(3.5×10^-6 mm³/N·m),with significantly improved wear resistance compared to electrical pure iron.The test results of coatings with different Si contents indicate that.As the Si target power increases,the diffraction peak intensity of the coating phase first increases and then weakens;The density of the coating gradually increases;The hardness increased from 9.6 Gpa to 19.8 Gpa;The corrosion resistance gradually improves,and the Si-150coating has the lowest corrosion current den-sity(8.83×10^-7 A/cm²);The wear resistance first increases and then decreases,and the Si-75 coating has the lowest friction coefficient（0.65）and lowest wear rate(1.9×10^-6 mm³/N·m)。The test results of the dual phase composite coating indicate that.The nitriding layer is mainly composed ofε-Fe₃N andγ’-Fe₄N,the coating phase is mainly CrN;The corrosion resistance is significantly improved compared to a single coating;In the air environment,the friction coefficient of the dual phase composite coating is higher than that of a single coating,and the wear rate is significantly reduced compared to a single coating.In a 3.5wt.%Na Cl corrosive environment,the wear rate of pure iron for electrical purposes increased by 61%compared to dry friction,and the friction coefficient of the dual phase composite coating was lower than that of a single coating.Except for the Si-100 coating,the wear rate of all other coatings decreased.