鎂合金表面激光熔敷+攪拌摩擦加工Al-Cu涂層的顯微組織與性能

鎂合金表面激光熔敷+攪拌摩擦加工Al-Cu涂層的顯微組織與性能Microstructure and properties of Al-Cu coating on magnesium alloys prepared by laser cladding+friction stir processing

采用激光熔敷(Laser cladding, LC)和攪拌摩擦加工(Friction stir processing, FSP)相結(jié)合技術(shù)在AZ31B鎂合金表面制備Al-Cu混合粉末的合金化涂層。采用SEM、EDS、XRD以及電化學(xué)腐蝕測(cè)試系統(tǒng)對(duì)Al-Cu涂層的顯微組織特征、相組成以及耐腐蝕性能進(jìn)行測(cè)試。結(jié)果表明：LC制備的Al-Cu涂層與基體呈良好的冶金結(jié)合，涂層主要由α-Mg、β-Al12Mg17及AlCu4組成；LC制備的Al-Cu涂層經(jīng)FSP之后，涂層表面宏觀成型平整光滑，表層組織均勻細(xì)化。電化學(xué)腐蝕結(jié)果發(fā)現(xiàn)經(jīng)FSP后的Al-Cu涂層耐腐蝕性能得到明顯提升，自腐蝕電位達(dá)到-0.989 V，比LC涂層的自腐蝕電位(-1.457 V)提高32.1%，比母材的自腐蝕電位(-1.563 V)提高36.7%。

Al-Cu powders were prepared on the surface of AZ31B magnesium alloy by a method of combining laser cladding and friction stir processing. The microstructure feature, phase component and corrosion resistance of the modified layer were studied by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffractometry (XRD) and electrochemical workstation. The composite modified layers with Al-Cu powders are composed of α-Mg, Al12Mg17 and AlCu4. Both modified layers show very good bonding with the magnesium alloy substrate. The corrosion resistance of the Al-Cu coating is higher than that of the substrate. Compared with the matrix and laser cladding, the maximum self-corrosion potential (-0.989 V) with Al-Cu powders prepared by friction stir processing increases by 36.7% and 32.1%, respectively.

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