钝化

Multi tool use
钝化(英语:Passivation)指金属表面由活泼态变化为不活泼态,使它不容易腐蚀的过程。由金属与介质自发相互作用(化学钝化),或金属通过电化学阳极氧化引起(阳极钝化)。
金属钝化會使其表面形成一层保护膜,厚几到几十纳米,钝化膜有侵蚀性阳离子难以扩散的结构,把金属与溶液隔离开,使金属溶解率大为降低。
发现
19世纪中叶,Christian Friedrich Schönbein 发现当一片铁被放入稀硝酸时,会溶解并产生气体,但若事先放入过浓硝酸,则反应速度会大大的减慢。
规范控制 |
- AAT: 300379619
- GND: 4173500-6
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