与同成分的传统粗晶材料相比,纳米晶材料的腐蚀电化学行为发生显著改变.纳米化会影响材料表面形成钝化膜的各种性能,但关于纳米化如何影响决定其腐蚀行为的钝化膜生长机制以及点蚀行为目前尚不明确.本文综述了近期针对纳米晶材料在含Cl的常温水溶液中的钝化膜生长及点蚀行为2个动态历程的研究结果,发现纳米化通过促进钝化膜的形核过程并提高钝化膜的生长速度,从而改善了钝化膜的致密性.纳米化改变了点蚀的萌生位置,抑制了稳态点蚀的形成和生长过程,从而提高材料抗局部腐蚀的能力.
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