Electrochemical and XPS Studies on Corrosion Behavior of Amorphous Ni-Cr-P-B alloys(Metallurgy)
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概要
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Amorphous Ni-Cr-P-B alloys, which possess a high corrosion resistance and are apt to form the amorphous structure, have been prepared by rapid quenching from melts. The alloys containing chromium of 7 and 9 at. % are not corroded in 10% FeCl_3・6H_2O at 30℃. Spontaneous passivation occurs on these alloys in 2N H_2SO_4 and 1N HCl, and a critical potential for pitting is not observed on the anodic polarization curves even in 1N HCl. Simultaneous determination of the thickness and composition of a passive film and the composition of the surface of substrate alloy directly under the passive film has been carried out by X-ray photoelectron spectroscopy. The passive film formed in 2N H_2SO_4 consists mainly of hydrated chromium oxy-hydroxide similar to those formed on corrosion-resistant crystalline alloys containing chromium and the composition of the surface of substrate alloy directly under the film is not different from that of bulk alloy. On the contrary, the composition of passive film formed in 1N HCl can be expressed as (Ni^<II>_<0.26> Cr^<III>_<0.74>) (PO_4)_<0.74>O_x(OH)_<0.52-2x>(1.74+x)H_2O and hence phosphate comprises 81% of constitutents of the passive film. In addition, the composition of the surface of substrate alloy directly under the film changes from that of bulk alloy. In conclusion, the amorphous Ni-Cr-P-B alloys with chromium of 7 to 9 at. % have a high corrosion resistance in strongly acidic solutions and the great resistance to pitting corrosion, but may not be always stable for a long time because of the change in alloy composition directly under the film.
- 東北大学の論文
著者
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Hashimoto Koji
The Research Institute For Iron Steel And Other Metals
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Masumoto Tsuyoshi
The Research Institute For Iron Steel And Other Metals
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Asami Katsuhiko
The Research Institute For Iron Steel And Other Metals
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Asami Katsuhiko
The Research Institute For Iron Steel And Other Metals Tohoku University
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HASHIMOTO Koji
The Research Institute for Iron, Steel and Other Metals
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