超声电沉积制备Ni-TiN涂层及其耐腐蚀特性研究

Preparation and corrosion behavior of Ni-TiN coatings deposited by ultrasonic electrodeposition

利用超声电沉积的方法,在低碳钢基体表面制得Ni-TiN涂层。用原子力显微镜、高分辨率透射电子显微镜、X射线衍射仪及扫描电镜对Ni-TiN涂层的微观形貌、组成及耐腐蚀特性进行研究。结果表明,超声波功率的增加,可使Ni-TiN涂层中的晶粒得到细化。Ni-TiN涂层的TiN粒子均匀镶嵌于镍晶粒中,基质镍晶粒得到细化,其Ni晶粒和TiN颗粒均为纳米数量级,其平均粒径分别约为80和30 nm。腐蚀试验表明,Ni-TiN纳米涂层的腐蚀速率很小,其平均腐蚀速率为1.9×10-5kg/(m2·h),其表面更加平整,腐蚀孔较少。

Ni-TiN coatings were successfully prepared by ultrasonic electrodeposition on the surface of mild steel. The coating microstructure,composition and corrosion behavior were investigated by atomic force microscopy, high-resolution transmission electron microscopy,X-ray diffraction,and scanning electron microscope.The re-sults indicate that the grains of Ni-TiN coating were refined with the increase of ultrasonic power.TiN particles are uniformly distributed in Ni-TiN nanocoating,and matrix grain was refined.the average diameter of Ni grains and TiN particles are respectively 80 and 30 nm,respectively.In corrosion tests,the corrosion rate of Ni-TiN nanocoating was very small,and it was about 1.9＆#215;10-5 kg/（m2？h）,and the surface was smoother,there were a few corrosion holes in the coating.