【摘要】 采用高速电弧喷涂技术在Q235钢基体表面制备FePSiBNb纳米结构涂层。利用X射线衍射仪(X-ray diffraction,XRD)、场发射电子扫描电镜(Scanning electron microscopy,SEM)、能谱仪(Energy dispersive spectrometer,EDS)和透射电镜(Transmission electron microscope,TEM)对涂层的微观组织结构进行了表征,并系统地研究了涂层在3.5%(质量分数)氯化钠溶液中不同浸泡时间下的电化学腐蚀行为。结果表明:FePSiBNb纳米结构涂层主要由α-Fe相纳米晶组成,平均尺寸为26nm。涂层呈层状结构且结合紧凑,孔隙率为1.6%。随着浸泡时间的延长,涂层的自腐蚀电位由浸泡1h时的-826mV上升到浸泡72h时的-728mV,然后逐渐下降到浸泡168h时的-936mV;而自腐蚀电流密度呈相反趋势:先由浸泡1h时的7.235μA/cm~2下降到浸泡72h时的4.363μA/cm~2,随后逐渐升高到浸泡168h时的23.05μA/cm~2。与Q235钢基体相比,FePSiBNb纳米结构涂层具有更好的耐腐蚀性能。更多还原

【Abstract】 FePSiBNb nanostructure coating was fabricated on Q235 steel substrate by high velocity electrical arc spraying process.The microstructure of coating was characterized by X-ray diffraction,scanning electron microscopy,energy dispersive spectrometer and transmission electron microscope.The electrochemical behaviors in 3.5%(mass fraction)NaCl solution of the coatings were studied by the electrochemical test with different immerse time.The results indicate that the FePSiBNb coating consists of nanoscaleα-Fe phase,and the average size of theα-Fe crystalline is about 26 nm.The porosity of the coating is 1.6%.With the immerse time increasing,the potential of the coating is increasing from-826 mV at 1 hto-728 mV at 72 hat first,and then it decreases to-936 mV at 168 h.The corrosive current of the coating has a variation from 7.235μA/cm~2 at 1 hto 4.363μA/cm~2 at 72 h,and then it increases to 23.05μA/cm~2 at 168 h.Compared with the Q235 steel,the coating shows the better corrosion resistance.更多还原