A SEM/EDXA study on the chemical attack of aqueous NaOH/KOH solutions on the surface of the metal-metalloid glass (Fe, Cr)80 (P, C, Si)20 and Fe75Cr5P8C10Si2, respectively |
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Authors: | Klaus Forkel Dietrich Born Fred Gustav Wihsmann Roland Stodolski |
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Affiliation: | (1) Advanced Technical College of Wildau, Friedrich-Engels-Strasse 63, D-15745 Wildau, Federal Republic of Germany;(2) Department of Chemistry, Humboldt University of Berlin, Rudower Chaussee 6, D-12489 Berlin, Federal Republic of Germany;(3) Federal Institute for Materials Research and Testing (BAM), Subsidiary Institutes at Berlin-Adlershof, Rudower Chaussee 5, D-12489 Berlin, Federal Republic of Germany;(4) Institute of Non-Metallic Materials, Technical University of Berlin, Englische Strasse 20, D-10587 Berlin, Federal Republic of Germany |
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Abstract: | After a treatment of the metal-metalloid glassy alloy (Fe, Cr)80 (P, C, Si)20 and Fe75Cr5P8C10Si2, respectively, by aqueous alkaline solutions of 1.0M NaOH + 1.0M KOH and 2.5M NaOH + 2.5M KOH, respectively, a SEM/EDXA study of the glass surface was performed.The results of the accelerated ageing procedure demonstrate that the glass treated with the 1.0M NaOH + 1.0M KOH solution at room temperature (20 °C) is characterized by a surface state like that of the initial material.For the glass treatment with the 2.5M NaOH + 2.5M KOH solution at 20 °C the surface layer shows a different morphology and is thicker. It can be supposed that the reinforcing property is reduced.The glass treatment at 80 °C with the aqueous solutions 1.0M and 2.5M (NaOH + KOH), respectively, leads to surface layers of different morphology and such a layer is about 5 m thick. The strength of solid residue of such a treated glass is very low.Dedicated to Professor Dr. rer. nat. Dr. h.c. Hubertus Nickel on the occasion of his 65th birthday |
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Keywords: | scanning electron microscopy (SEM) energy dispersive x-ray analysis (EDXA) metal-metalloid glassy alloy of chemical composition (Fe, Cr)80 (P, C, Si)20 accelerated ageing procedure aqueous alkaline environment of mixed NaOH + KOH |
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