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中文摘要：
利用开路电位-时间（Eocp-t）曲线，研究铝表面经浸镍和化学预镀镍前处理后，化学沉积镍的初期行为：通过扫描电子显微镜（SEM）观察铝表面经前处理后的表面形貌．结果表明：未经及经前处理的铝表面，化学沉积镍的初期行为都经历去氧化膜、活化、混合控制以及化学沉积过程．经过浸镍和化学预镀镍前处理后的铝表面附着细小的镍颗粒．依据Eocp-t和SEM的最佳实验结果，在含有络合剂和还原剂的碱性预镀镍溶液中，经二次化学预镀镍前处理，成功实现铝基底弱酸性化学镀镍．所获得的化学镀镍层与铝基底结合牢固，呈团颗粒状形貌和非晶态结构．
英文摘要：
The initial behavior of electroless nickel deposition on aluminum pretreated by nickel immersion and electroless nickel pre-plating processes was studied measuring the open circuit potential （OCP） as a function of time （Eocp-t）. Scanning electron microscopy （SEM） was used to observe the surface morphology of the pretreated specimens. During the initial stages of the electroless nickel deposition, all pretreated and un-pretreated aluminum substrates experienced removal of the oxide film, activation, mixed control and electroless nickel deposition. After nickel immersion and electroless nickel pre-plating, fine nickel particles were attached to the surface of the aluminum. Our experimental results, including Eocp-t and SEM, indicate that electroless nickel plating in a weak acidic bath was successfully accomplished on the aluminum pretreated with a double treatment of electroless nickel pre-plating in an alkaline nickel solution containing a complexing agent and a reductant. The nickel coating obtained adhered to the aluminum substrate, had a granular appearance and an amorphous structure.
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