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電弧噴涂Zn-Al-Mg-La-Ce涂層的耐腐蝕性能

Corrosion resistance of Zn-Al-Mg-La-Ce coatings by electric arc spraying

  • 摘要: 采用電弧噴涂法制備Zn-Al-Mg-La-Ce涂層,通過鹽霧試驗對涂層進行腐蝕,利用能譜分析、X射線衍射分析、掃描電鏡觀察、極化曲線以及電化學阻抗譜等手段對腐蝕前后的Zn-Al-Mg-La-Ce涂層進行了研究.結果表明:實驗制備的Zn-Al-Mg-La-Ce涂層具有較好的自封閉效果,組織致密,在腐蝕過程中表面的微觀孔隙能夠被自身的腐蝕產物有效堵塞,涂層表面形成的致密腐蝕產物層能夠阻止腐蝕的進一步發生.因此,Zn-Al-Mg-La-Ce涂層具有優異的耐蝕性能.

     

    Abstract: Zn-Al-Mg-La-Ce coatings were prepared by electric arc spraying,and their corrosion behavior was studied with salt spray test.The characteristics of the coatings before and after corrosion were investigated by energy dispersive spectrometry(EDS),X-ray diffraction(XRD),scanning electron microscopy(SEM),polarization curves,and electrochemical impedance spectroscopy.It is shown that the coatings have outstanding self-sealing effectiveness,and their structures are compact.During corrosion,microscopic pores on the surfaces of the coatings can be jammed with their own corrosion products,thus forming a dense corrosion product layer to prevent from further corrosion.Consequently,the corrosion resistance of Zn-Al-Mg-La-Ce coatings is superior to that of normal coatings.

     

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