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- W2024693755 abstract "Durch potentionstatische und potentiokinetische Polarisationsmessungen an verschiedenen 18 Cr-10 Ni-Stählen mit Molybdängehalten bis zu 4,3% in 25 und 45 proz. Ammoniumrhodanidlösungen wurde festgestellt, daß die Ursache der Lochkorrosion im Potentialbereich von –300 bis +250 m V H auf einer unvollständigen Passivierung beruht. Die Ausbildung stabiler Passivschichten wird hier durch die Bildung und lokale oxidative Wiederauflösung sulfidischer Deckschichten gestört. Oberhalb +250 m V H wirken Rhodanidionen in den schwachsauren Ammoniumrhodanidlösungen ähnlich wie Chloridionen als passivitätszerstörendes Agens. Die Durch potentionstatische Halteversuche ermittelten Grenzpotentiale der stabilen Lochkorrosion werden mit zunehmendem Molybdängehalt von –300 bis nach –150 m V H verschoben. Die geringste Lochkorrosionsneigung zeigte der Stahl mit dem höchsten Molybdängehalt. Pitting corrosion of austenitic CrNiMo-steels in concentrated ammoniumrhodanide solutions Quasipotentiostatic and potentiokinetic polarisation measurements at various 18 Cr-10 Ni steels with molybdenum contents up to 4,3% were performed in 25 and 45% ammoniumrhodanide solutions. It was found that pitting corrosion is caused by incomplete passivation in the potential range of –300 to +250 m V H. At these potentials the formation of stable passive layers is hindered by the formation and local oxidative dissolution of sulfidic layers. Above +250 m V H rhodanide ions act in these weak acidic ammoniumrhodanide solutions as agents which destroy passive layers, comparable with chloride ions. The limiting potentials for stable pitting corrosion, obtained from potentiostatic experiments, are shifted from –300 to –150 m V H with increasing molybdenum content of the steel. The least tendency of pitting corrosion was found for that steel with the highest molybdenum content." @default.
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- W2024693755 date "1978-12-01" @default.
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- W2024693755 title "Zur Lochkorrosionsneigung von austenitischen CrNiMo-Stählen in konzentrierten Ammoniumrhodanidlösungen" @default.
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- W2024693755 doi "https://doi.org/10.1002/maco.19780291204" @default.
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