Corrosion protection mechanisms of TiMgN hard coatings on steel
- . Hard coated steel components are used in a wide application range, mostly for protective, wear resistant and decorative purposes. Despite of these coatings being regarded as relatively dense, there is always a high risk of localized corrosion when a coated low alloyed steel component encounters a surrounding high humidity atmosphere or even an aqueous medium. An approach to enhance the corrosion properties is the addition of magnesium to physical vapor deposited hard coatings, like TiN. It has been found that there is a remarkable increase in corrosion resistance in dependence of magnesium content of the TiMgN coating and its surface properties. In this work the authors will explain the underlying corrosion protection mechanisms by means of electrochemical and analytical studies. The positive impact of magnesium in the coating relates on its preferred dissolution vs. steel. This causes the potential to shift to more negative direction with respect to the steel substrate and. Hard coated steel components are used in a wide application range, mostly for protective, wear resistant and decorative purposes. Despite of these coatings being regarded as relatively dense, there is always a high risk of localized corrosion when a coated low alloyed steel component encounters a surrounding high humidity atmosphere or even an aqueous medium. An approach to enhance the corrosion properties is the addition of magnesium to physical vapor deposited hard coatings, like TiN. It has been found that there is a remarkable increase in corrosion resistance in dependence of magnesium content of the TiMgN coating and its surface properties. In this work the authors will explain the underlying corrosion protection mechanisms by means of electrochemical and analytical studies. The positive impact of magnesium in the coating relates on its preferred dissolution vs. steel. This causes the potential to shift to more negative direction with respect to the steel substrate and additionally leads to a temporarily passivation of the steel due to alkalization of the surrounding electrolyte by formation of magnesium hydroxide.…
Autor*innen: | A. Heyn, Thoralf MüllerORCiD, M. Balzer, M. Fenker, H. Kappl |
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Dokumenttyp: | Beitrag zu einem Tagungsband |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Deutsch): | Tagungsband zum 20. Werkstofftechnischen Kolloquium |
Jahr der Erstveröffentlichung: | 2018 |
Organisationseinheit der BAM: | 7 Bauwerkssicherheit |
7 Bauwerkssicherheit / 7.6 Korrosion und Korrosionsschutz | |
Herausgeber (Institution): | TU Chemnitz, Fakultät für Maschinenbau, Institut für Werkstoffwissenschaft und Werkstofftechnik |
Verlag: | Eigenverlag |
Verlagsort: | Chemnitz |
Jahrgang/Band: | 72 |
Erste Seite: | 74 |
Letzte Seite: | 83 |
DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten |
Freie Schlagwörter: | Corrosion; Magnesium; PVD hard coating; Titanium nitride |
Themenfelder/Aktivitätsfelder der BAM: | Material |
Veranstaltung: | 20. Werkstofftechnisches Kolloquium |
Veranstaltungsort: | Chemnitz, Germany |
Beginndatum der Veranstaltung: | 14.03.2018 |
Enddatum der Veranstaltung: | 15.03.2018 |
ISSN: | 1439-1597 |
ISBN: | 978-3-00-058901-0 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 20.03.2018 |
Referierte Publikation: | Nein |