Nickel-Phosphorus Deposition on Pretreated Aluminium Alloys during Immersion in Electroless Nickel Bath

作     者：Chike F. Oduoza Enam Khan 

作者机构：University of Wolverhampton School of Engineering & Built Environment SC-040 Telford Campus Priorslee Telford TF2 9NTShropshire United Kingdom 

出 版 物：《材料科学与工程（中英文A版）》 (Journal of Materials Science and Engineering A)

年 卷 期：2011年第1卷第4X期

页      面：457-471页

学科分类：080503[工学-材料加工工程] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：化学镀镍磷 预处理过程 浸泡时间 镍沉积 铝合金 X射线光电子能谱 扫描电子显微镜 氧化还原反应 

摘      要：Electroless nickel deposition as a non-electrochemical redox reaction process involving the reduction of nickel ions to nickel has been widely used in the plating industry especially for pretreatment of aluminum alloys to enhance corrosion and wear properties. This paper has studied the surface structural characteristics of nickel-phosphorus deposition onto aluminium alloys during autocatalytic nickel immersion using hypophosphite ion as reducing agent. The analysis explains the development of grains and crystal orientation during nucleation, growth and coalescence of crystallites. Surface changes as a result of electroless Ni-P deposition were characterized using scanning electron microscope (SEM), and X-Ray diffraction pattern analysis while surface elemental composition and changes during pretreatment were determined using Energy Dispersive X-ray Analysis (EDXA) and X-ray-Photoelectron Spectroscopy. Overall, surface analyses results of pretreated aluminium alloys immersed in electroless nickel bath varied from alloy to alloy and showed differences in surface elemental composition as well as significant phase and morphological changes with immersion time which could have affected the pretreatment process.