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織構對納米晶純鎳鍍層耐蝕性能的影響

Effect of textures on the corrosion resistance of nanocrystalline Ni coatings

  • 摘要: 采用脈沖電鍍法在黃銅表面制備出具有(111)、(200)和(220)晶面擇優生長織構的納米晶純鎳鍍層.采用掃描電鏡對鍍層的顯微形貌進行觀察,采用X射線衍射對不同晶面織構的擇優性進行表征,并對鍍層在3.5%NaCl溶液中的動電位極化曲線和交流阻抗譜進行了測試,研究不同織構鍍層的耐蝕性能.不同織構鍍層的耐蝕性能存在顯著差異:具有(220)強織構的鍍層耐蝕性最差,其自腐蝕電流密度最大,為1.23μA·cm-2,鍍層的電荷轉移電阻為2.09kΩ·cm2;具有(200)強織構的鍍層耐蝕性能最佳,鍍層的電荷轉移電阻為27.32kΩ·cm2,自腐蝕電流密度為0.15μA·cm-2;具有(111)織構鍍層的耐蝕性居中.認為織構引起的表面胞狀物的差別是造成純鎳鍍層耐蝕性能不同的原因.

     

    Abstract: Nanocrystalline Ni coatings with (111), (200) and (220) textures were respectively pulse-electrodeposited on brass. Scanning electron microscopy (SEM) was used to observe their microstructures, X-ray diffraction (XRD) analy-sis was adopted to identify the texture degree, and the anodic polarization curves and electrochemical impedance spectra were tested to investigate the corrosion resistance of the pulse-electrodeposited Ni coatings in 3.5% NaCl solution. An obvious difference in corrosion resistance exists among the coatings with different textures. The coating with (220) texture exhibits the worst corrosion resistance, with the corrosion current density of about 1.23μA·cm-2 and the coating polarization resistance of 2.09 kΩ·cm2; the coating with (200) texture has the best corrosion resistance, with the corro-sion current density of about 0.15μA·cm-2 and the coating polarization resistance of about 27.32 kΩ·cm2; the coating with (111) texture shows a corrosion resistance in between. The difference of surface island microstructures incurred by growth textures might be the reason for the different corrosion resistances of the as-deposited Ni coatings.

     

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