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Investigation of the pitting corrosion behaviour of nickel based alloy claddings by evaluation of electrochemical noise measurements

  • Claddings of different nickel based alloys were generated on a mild Steel (S235JR) and a stainless steel type 304 by Cold Metal Transfer (CMT). This welding procedure possesses a low degree of mixing between the Substrate and cladding material. Thus it improves the corrosion behaviour of the claddings. The aim of our investigations was to examine the effect of the welding parameters: energy per unit length, shielding gas and finishing surface treatment on the pitting corrosion behaviour of the claddings. However, under Standard test conditions nickel based alloys are often resistant to pitting corrosion. Moreover these test methods are inaccurate and require a large period of time resulting from the iterative progress to determine the critical pitting temperature (CPT). A potentiostatic test method was modified using a high concentrated CaCI2-solution and a conventional three electrode measuring cell. The pitting corrosion behaviour is calculated from current noise charges. During theCladdings of different nickel based alloys were generated on a mild Steel (S235JR) and a stainless steel type 304 by Cold Metal Transfer (CMT). This welding procedure possesses a low degree of mixing between the Substrate and cladding material. Thus it improves the corrosion behaviour of the claddings. The aim of our investigations was to examine the effect of the welding parameters: energy per unit length, shielding gas and finishing surface treatment on the pitting corrosion behaviour of the claddings. However, under Standard test conditions nickel based alloys are often resistant to pitting corrosion. Moreover these test methods are inaccurate and require a large period of time resulting from the iterative progress to determine the critical pitting temperature (CPT). A potentiostatic test method was modified using a high concentrated CaCI2-solution and a conventional three electrode measuring cell. The pitting corrosion behaviour is calculated from current noise charges. During the test the course of corrosion is detected online by the evaluation of electrochemical noise Signals while a continuous increase of temperature by a defined heating rate is realised. Thus a critical pitting temperature can be estimated by only one attempt. Furthermore the deviation of the measured CPT is very low compared to Standard tests using gravimetrical and microscopic evaluation. That enables to figure out the influence of the welding parameters in an exact way.zeige mehrzeige weniger

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Metadaten
Autor*innen:S. Schmigalla, Andreas Heyn, V. Wesling, R. Reiter, P. Echtermeyer
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Graue Literatur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):EUROCORR 2011 - Developing solutions for the global challenge
Jahr der Erstveröffentlichung:2011
Herausgeber (Institution):DECHEMA
Erste Seite:1
Letzte Seite:9
Freie Schlagwörter:Elektrochemie; Elektrochemisches Rauschen; Korrosionsprüfung; Nickelbasislegierung; Plattieren; Schweißverfahren
Cold metal transfer
Veranstaltung:EUROCORR 2011 - Developing solutions for the global challenge
Veranstaltungsort:Stockholm, Sweden
Beginndatum der Veranstaltung:04.09.2011
Enddatum der Veranstaltung:08.09.2011
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:19.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:27.10.2011
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