选择柠檬酸型镀液，用脉冲电镀法成功制备纳米锌镀层;并用电化学法和随机法等研究纳米化对纯锌点蚀行为的影响.结果表明：纳米锌和铸态锌的点蚀击破电位均服从正态分布;纳米化增加了纯锌点蚀击破电位对电位扫描速度的敏感性，使纯锌的点蚀产生类型由B1（parallel）型转为B2（series）型，并能抑制纯锌的点蚀生长.
Pulse electrodeposition was used to deposit nanocrystalline(NC)zinc coating on A3 steel from a citric acid bath.The grain size and preferential orientation of grains of the coatings were determined by X-ray diffraction.Pitting corrosion behavior of the NC zinc coating was investigated by using potentiostatic and potentiodynamic polarization methods in 05 mol/L NaCl(pH=12)solution.Pitting corrosion behavior was characterized by pitting potential,pitting initiation time as well as the stable pit growth rate,which was analyzed by statistical method.The results show that a nanocrystalline zinc(21.5 nm)coating has been prepared.The distribution of Epit obeyed the normal probability distribution.Nanocrystallization increased the sensitivity of Epit refer to potential sweep velocity.Nanocrystallization changed the type of the pit generation from B1(parallel)to B2(series),accelerated the pit generation and inhibits the stable pit growth rate.
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