CAJ | 학술논문

设计一种原位方法去测量AZ31镁合金在化学镀Ni-P过程中基体在镀液中的开路电位和体积表面的镀层形貌变化.通过开路电位曲线、扫描电子显微镜和能谱分析研究AZ31镁合金化学镀Ni-P的沉积机理.结果表明:化学镀Ni-P的沉积过程包括镀层的形成过程和镀层的增厚过程,其中镀层的形成过程又包括镍晶核的形核和长大过程、镀层的二维扩展过程和镀层的三维搭接过程.扫描电镜分析证实了Ni-P镀层的球形瘤状物不仅形成于镀层的增厚阶段,同样也形成于Ni-P镀层的初始沉积阶段.不同沉积阶段的沉积速度变化分别与各自的沉积机理对应.
설계일충원위방법거측량AZ31미합금재화학도Ni-P과정중기체재도액중적개로전위화체적표면적도층형모변화.통과개로전위곡선、소묘전자현미경화능보분석연구AZ31미합금화학도Ni-P적침적궤리.결과표명:화학도Ni-P적침적과정포괄도층적형성과정화도층적증후과정,기중도층적형성과정우포괄얼정핵적형핵화장대과정、도층적이유확전과정화도층적삼유탑접과정.소묘전경분석증실료Ni-P도층적구형류상물불부형성우도층적증후계단,동양야형성우Ni-P도층적초시침적계단.불동침적계단적침적속도변화분별여각자적침적궤리대응.
An in situ method was designed to measure a continuous open circuit potential (OCP) curve of AZ31 magnesium alloy and to observe the morphology variation of Ni-P coating during the process of the electroless plating.The deposition mechanism of the electroless Ni-P plating on AZ31 Mg alloy was studied by OCP curve,scanning electron microscopy (SEM),and energy dispersion spectroscopy (EDS),The process of electroless Ni-P plating contains the coating formation stage and the coating growth stage.The formation stage includes three procedures,i.e.,the nucleation and growth of Ni crystallites,the extension of the coating in two-dimensional (2D) direction and the coalescence of the coating along three-dimensional (3D) direction.SEM investigations demonstrate that the spherical nodules of the Ni-P coating are not only formed during the coating growth stage,but also generated in the initial deposition stage of electroless Ni-P plating.The variation of the coating rates at different deposition stages corresponds to the deposition mechanism of their respective deposition stage.