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应用X射线光电子能谱(XPS)和第一性原理计算的方法研究了纳米化对Fe20Cr合金在Cl-浓度为0.1 mol/L的硼酸缓冲溶液中Cl-吸附行为的影响。结果表明,Cr对Cl-吸附行为有两方面的影响:根据理论计算结果,随着界面处Cr元素含量的增加Cl-的吸附能逐步降低,易于Cl-的吸附;但是在实际环境中Cr含量的增大导致合金更易于形成Cr氧化物的钝化膜,从而阻止Cl-的吸附行为。纳米化加速了Cr元素的扩散行为,导致Cr元素在钝化膜内及钝化膜/金属界面的富集。由此可见,纳米化抑制了Cl-吸附及在钝化膜内的扩散行为,提高了钝化膜的耐蚀能力。
X-ray photoelectron spectroscopy (XPS) and first-principles calculations were used to investigate the effect of nanocrystallization on the Cl- adsorption behavior of Fe20Cr alloy in a borate buffer solution with a Cl- concentration of 0.1 mol / L. The results show that Cr has two effects on the Cl- adsorption behavior: According to the theoretical calculation results, the adsorption capacity of Cl- decreases gradually with the increase of Cr content at the interface, which is easy to adsorb Cl-. However, in the actual environment, the Cr content Increases lead to the alloy being more likely to form a passivation film of Cr oxide, thereby preventing the Cl- adsorption behavior. Nanocrystallization accelerated the diffusion behavior of Cr elements, resulting in the enrichment of Cr elements in the passivation film and at the passivation film / metal interface. Thus, nano-inhibition of Cl-adsorption and diffusion in the passivation film to improve the corrosion resistance of the passivation film.