Improvement of Environmental Resistance by Nano-Scale Surface Modification

当表面氧化物薄膜中出现的腐蚀抵抗力时，它防止了底层合金对环境的有害影响。因此，腐蚀阻力在很大程度上取决于表面薄膜的结构。在目前的工作中，我们开发了一些工艺，改进了表面薄膜的纳米结构，以获得更多的保护性薄膜。最后一点被描述为以下。（1）不锈钢上被动薄膜的化学修饰;活性溶解和被动吸收衍生出选择性Fe溶解和Cr增强在被动薄膜中表现出优异的腐蚀抵抗力。特别是在F中的过程。这些浴缸已经开发出来了。（2）不锈钢上的离子植入;铬植入产生了带有浓缩铬的被动薄膜。不管怎样，它提供了一种方法，即预先和后处理可以修改底层的纳米结构，以达到高腐蚀抵抗力。（3）用超紫光辐照对被动电影的修改;用紫外光辐照对Fe-Cr和不锈钢的被动电影进行了修改，以获得更高的腐蚀抵抗力。The Photo Quantum effect Enriched the Cr in the Passive Film.（4）用离子束散射有序结构形成高corrosistance薄膜;用普通等级的化学成分，但具有高同源结构的非常高corrosistance不锈钢薄膜。添加剂的影响也被讨论了。（5）氧化物尺度在很小的Zr添加剂上进行纳米修饰;对TiAl的高温腐蚀的抵抗力通过0.2%的Zr添加剂得到改进。Zr addition was proved to modify the Al-D22-D2O-D23-D2 scale thinner and more homogeneous。Zr添加剂改变了纳米结构的尺度，以减少氧输入的扩散。

The corrosion resistance is obtained by the surface oxide film, which prevents the substrate alloys from harmful effect of the environment. Therefore, the corrosion resistance is highly depends on the structure of the surface film. In the present work, we developed some processes, which modify nano structure of the surface film to obtain more protective films. The summaries are described below. (1) Chemical modification of passive film on stainless steels; the combination of active dissolution and passivation derived selective Fe dissolution and Cr enrichment in the passive film to show excellent corrosion resistance. Especially, a process in F? ions containing bath was developed. (2) Ion implantation on stainless steels; Cr implantation derived the passive film with concentrated Cr. However, it was proved that pre and post treatments to modify the nano structure of the substrate were necessary in order to obtain high corrosion resistance. (3) Modification of passive film by ultra-violet light irradiation; passive film of Fe-Cr and stainless steels were modified by uv light irradiation to obtain much higher corrosion resistance. The photo quantum effect enriched the Cr in the passive film. (4) Formation of high corrosion resistance thin alloys film with ordered structure by ion beam sputtering; very high corrosion resistant stainless steel films were obtained with chemical composition of ordinary grade, but with highly homogeneous structure. The effects of additives were also discussed. (5) Nano modification of the oxide scales formed on TiAl by very small Zr addition; the high temperature corrosion resistance of TiAl was improved by 0.2% Zr addition to TiAl. Zr addition was proved to modify the AlィイD22ィエD2OィイD23ィエD2 scale thinner and more homogeneous. The Zr addition changed the nano structure of scales to reduce diffusion of oxygen inward.