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- W2085964228 abstract "In low nickel ion containing, weak acidic, electrolytic coloring solutions for anodized aluminium, austenitic stainless steel counter electrodes dissolve transpassively. The role of nickel and cobalt ions in preventing the transpassive dissolution of AISI Type 304 and 316 austenitic stainless steel counter electrodes was investigated. Potantiodynamic polarization method was used. The test solutions were a buffer (29.66 g/lt boric acid), a buffered supporting electrolyte (32.6 g/lt boric acid + 26.18 g/lt magnesium sulphate heptahydrate + 14,95 g/lt ammonium sulfate) and the coloring solutions (supporting electrolyte with different nickel (27.6–101 g/lt as heptahydrated sulfate) and cobalt (33–166 ppm) content). The oxidation of bivalent nickel ions starts 200 mV lower than the transpassive dissolution of stainless steel. However, even a small amount of cobaltous ions (165 ppm) in the solution produces a much steeper oxidation peak on the top of the nickel oxidation current. In order to transpassively dissolve a stainless steel electrode in cobalt containing nickel solutions, anodic current must be greater than the combined oxidation peak of nickel and cobalt ions, otherwise the working potential of the stainless steel electrode is always kept at the passive region hence the transpassive dissolution is prevented.Verhutung transpassiver Auflosung von Edelstahl-Gegenelektroden in nickelarmen schwach sauren Farbelosungen fur AluminiumIn nickelarmen, schwach sauren Farbelosungen fur Aluminium losen sich die Edelstahl-Gegenelektroden transpassiv auf. Es wurde untersucht, welchen Einflus der Gehalt an Nickel- und Kobaltionen auf diesen Prozes fur Gegenelektroden aus AISI 304 und 316 hat. Hierzu wurden potentiodynamische Messungen in einem Borsaure-Puffer mit 29,66 g/l B2O3, in einer Losung mit 32,6 g/l B2O3, 26,18 g/l MgSO4 7H2O und 14,95 g/l (NH4)2SO4 sowie in den Farbelosungen mit 27,6–101 g/l NiSO4 7H2O und 33–166 ppm Co2+ durchgefuhrt. 200 mV unter dem Beginn der transpassiven Auflosung der CrNi-Stahle beginnt die Oxidation der Ni2+-Ionen. Bereits ein Zusatz von 165 ppm Co2+ bewirkt einen starken zusatzlichen Oxidations-Peak. Wenn die Arbeits-Stromdichte der Gegenelektroden unter dem Wert dieses Peaks bleibt, kann eine transpassive Auflosung der CrNi-Stahlelektroden verhindert werden." @default.
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- W2085964228 date "1992-01-01" @default.
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- W2085964228 title "Prevention of transpassive dissolution of austenitic stainless steel counter electrodes in nickel based electrolytic coloring solutions for anodized aluminum" @default.
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- W2085964228 doi "https://doi.org/10.1002/maco.19920430103" @default.
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