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研究了35％Ni,12～28％Cr的铁镍铬合金U形试样,在高温水中形成的拉应力侧的表面膜组成和结构。基体上的或从基体上剥离下来的表面膜用俄歇电子谱仪(AES)和扫描电镜测定,主要是由Fe、Cr、Ni等元素的氧化物所组成。经X光结构分析、电子衍射和电子分光镜化学分析(ESCA),认为膜中有含水的化合物、尖晶石结构的氧化物和其他更复杂的化合物。随合金中铬含量的提高,表面膜从以铁-尖晶石结构为主的氧化物,过渡到以铬-尖晶石结构的氧化物为主。铬在表面富集并构成致密而稳定的氧化物膜。镍在表面膜与基体的交界处富集,因而使合金耐蚀性显著提高。
The composition and structure of the surface film on the tensile stress side in 35% Ni and 12-28% Cr iron-nickel-chromium alloy U-shaped specimens were studied. The surface of the substrate or stripped from the substrate by Auger electron spectroscopy (AES) and scanning electron microscopy, mainly by Fe, Cr, Ni and other elements of the oxide composition. X-ray structural analysis, electron diffraction and electron spectroscopy chemical analysis (ESCA), the film that contains water-containing compounds, spinel oxide and other more complex compounds. With the increase of chromium content in the alloy, the surface film transitioned from the oxide mainly of iron-spinel structure to the oxide of chromium-spinel structure. Chromium is enriched on the surface and forms a dense and stable oxide film. Nickel is enriched at the interface between the surface film and the substrate, thereby significantly improving the corrosion resistance of the alloy.