Fe-Cr合金濺射納米晶薄膜腐蝕電化學(xué)行為的XPS及第一性原理計(jì)算的研究
[Abstract]:Magnetron sputtering stainless steel nanocrystalline films have better corrosion resistance than coarse-grained materials of the same composition. It was found that the surface nanocrystalline of Cr could promote the enrichment of Cr in the passivation film and inhibit the surface adsorption of Cl-, but the microcosmic and essential mechanism of the nanocrystalline reaction was not clear. In this thesis, Fe-Cr alloy, a model alloy system of stainless steel, was used to passivate the sputtering nanocrystalline thin films by traditional electrochemical measurement, surface analysis and first-principle calculation. The surface adsorption and transport behavior of Cl- in the passivation film were studied. The effect of nanocrystalline on the corrosion behavior of Fe-Cr alloy is discussed. The results of ARXPS surface analysis show that, The passivation films formed on the surface of coarse-grained Fe-20Cr alloys and nano-crystalline films deposited in 0.15 MB (OH) _ 3 0.075M Na2B4O7 10H2O (pH8.6) buffer solution have hydrated layers with outer hydroxides and oxygen as inner layers. The double layer structure of the chemical layer. Compared with coarse-grained alloy, the Cr content in the passivation film and the passivation film / metal interface on the nanocrystalline surface is higher than that in the coarse crystal alloy, that is, the nanocrystalline content is favorable to the enrichment of Cr in the interface and the passivation film. The theoretical calculation was carried out by the first principle, and the Fe/FeO interface was set up, and the theoretical models of the interface and the passivation film were simulated by Fe12O18 unit cell, respectively. The results showed that the passive film / metal interface was the stable position of the Cr element. And the passivation film is more stable with the increase of Cr content. The analysis of PDM model revealed that nanocrystalline promoted the enrichment of Cr elements by accelerating the dissolution of Fe and the diffusion of vacancies, especially in the interfacial layer. The results show that the content of Cr in Fe-Cr alloy (Fe-lOCr, Fe-20Cr.) is less than 30%. Fe-30Cr) after soaking 5min in HCl NaCl (pH=2, [Cr-] = 0.1M solution, the amount of Cl- adsorbed on the metal surface increased with the increase of Cr content. When the content of Cr is 50% and 75%, it is easier for the metal surface to form a passivation film dominated by the oxide of Cr, thus preventing the adsorption of Cl-. The interface model of Cl-/Fe was constructed by first-principle calculation method, and the most stable position of Cl- adsorbed on metal surface was found. Cr was used to replace the Fe, at the interface. Then the adsorption energy of Cl- and the adsorption distance of Cl- on the surface of Cl- were calculated theoretically. The results show that the adsorption energy and distance of Cl- decrease with the increase of the content of Cr at the interface of the alloy. In addition, from the electronic point of view, the structure of metal valence electrons is closely related to the adsorption of Cl-. Because the element of Cr has more 3D empty orbitals, it has stronger hybrid ability with Cl- and is easy to adsorb Cl-. The theoretical results are in good agreement with the UPS test results. The experimental phenomenon that the adsorption amount of Cl- increases with the increase of Cr content is explained. The transport behavior of Cl- in the passivation film was studied. The results show that in the acidic solution of HCl NaCl (pH=2, [Cr-] = 0.1M, nanocrystalline film inhibits the adsorption of O and Cl-, and accelerates the formation of passivation film. The nanocrystalline concentration of Cr element in the inner layer of passivation film is favorable. First-principle calculations show that oxygen vacancies are most stable at the Fe/FeO interface, and nanocrystals are conducive to the generation of vacancies at the interface. Because of the enrichment of Cr in the passivation film, the diffusion process of Cl- from the passivation film to the interface of the metal / passivation film becomes difficult, and the nanocrystalline is not conducive to the entry and transport of Cl-. The thermodynamic and electronic results of the first principle calculation and UPS experiments were used to explain the experimental results of the nanocrystalline passivation and corrosion resistance of Fe-20Cr alloys.
【學(xué)位授予單位】:大連理工大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:TG174.4
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