二次浸锌得到的锌晶粒比一次浸锌更细小、均匀和致密，对基体覆盖能力好。
Finer, more uniform and denser zinc crystals were attained by secondary zinc coating with better covering capacity.
与其他烧结方法相比，激光烧结制备的纳米材料晶粒尺寸更为细小，组织结构更为致密。
Compared with other sintering methods, the nano-ceramic materials with the finer grain size and the higher density can be obtained by SLS technology.
晶粒长大、晶界面积减少以及镀层表面生成较厚的、致密的氧化膜是耐蚀性提高的主要原因。
The main cause of better corrosion resistance was due to growth of granules, decrease of grain boundary area, and formation of thick and compact oxidation film on the coating surface.
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