Influence Of Chromium Content Research Articles

Influence of chromium content on the tribotechnical properties of titanium-chromium alloys

Influence of chromium content on the tribotechnical properties of titanium-chromium alloys

Influence of chromium content on corrosion resistance of low alloyed chromium steels in hydrofluoric acid and in other acid environments

The influence of chromium content on the corrosion resistance of low alloyed chromium steels is studied in 1·7M (3%) HF, 1·4M (5%) HCl, 0·75M H2S04, and 1·5M HClO4 at 45°C. The presence of chromium in the steels decreases their corrosion resistance in HF solutions, and to a lesser extent in H2SO4 and HClO4 acid solutions. There was little effect in the HCl solution.

The influence of chromium content and potential on the surface composition of FeCrMo alloys studied by AES

The influence of chromium content and polarization potential on the surface composition of ferritic FeCrMo alloys with 11 wt.% Mo exposed to hydrochloric acid has been investigated by AES depth profile analysis in order to contribute to the resolution of apparently contradictory results in the literature and to the better understanding of the role of molybdenum for the corrosion behaviour of stainless steels. A new approach to the interpretation of AES depth profiles has been used which is based on determining relative composition changes with respect to a suitably chosen standard. Contrary to published AES studies but consistent with XPS results enrichment of molybdenum in the active and low passive potential region was observed. However, no straightforward relationship between the molybdenum content of the passive film and the pitting resistance of the alloy could be found.

Influence of chromium content on the coloration of PbMoO 4 crystals

Optical and ESR measurements have been performed on Cr doped PbMoO 4 single crystals. A linear correlation has been established between the chromium concentration and the intensity of the color-inducing 430 nm band. From ESR results, a mechanism involving chromium ions located at molybdenum sites together with oxygen vacancies is suggested to be responsible for the yellow coloration of PbMoO 4 crystals.

Influence of chromium content on carburization of chromium-nickel-iron alloys in carbon dioxide

The use of carbon dioxide or other gases that contain carbon dioxide as nuclear reactor coolants presents certain compatibility problems in the reactor system. One of the more important of these concerns reactions of the gas with stainless steel fuel element cladding that may introduce carbon into the steel. This paper presents the results of an investigation of the carburization of Fe-9 % Ni, varying Cr alloys in pure carbon dioxide at 600 to 800° C. It is shown that the rate of carburization increases as the chromium content increases from 7 to 11 % Or and decreases sharply on further increase in chromium content to about 20 % Cr. The mechanism causing carburization in these alloys depends on the composition and nature of the oxide film. The existence of large amounts of Cr 2O 3 in the film reduces the tendency for carburization in the higher chromium content alloys.