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Empowering PVD for corrosion protection : TiMgGdN coatings with game‐changing corrosion performance: A genuine competitor to electroplated chromium

Hoche, Holger ; Ulrich, Thomas ; Kaestner, Peter ; Oechsner, Matthias (2024)
Empowering PVD for corrosion protection : TiMgGdN coatings with game‐changing corrosion performance: A genuine competitor to electroplated chromium.
In: Vakuum in Forschung und Praxis, 36 (2)
doi: 10.1002/vipr.202400813
Article, Bibliographie

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Abstract

A novel, monolithic DC‐magnetron sputtered TiN+MgGd coating, only 3 to 5 μm thick, effectively protects steel substrates from corrosion. This achievement is due to alloying of TiN with MgGd, which not only maintains the renowned wear resistance of TiN coatings, but potentially improves it through optimized deposition parameters.

The key to the enhanced corrosion resistance lies in the addition of magnesium (Mg) and gadolinium (Gd). It reduces the coating's free corrosion potential, thereby mitigating the driving force for galvanic corrosion between coating and substrate. Moreover, at specific Mg to Gd ratios, a cathodic protection effect can be observed. Crucially, the presence of Gd is essential for this performance. It imparts hydrophobicity to the coating surface, reinforces a passivating layer and significantly enhances defect tolerance.

This discovery paves the way for a sustainable alternative to electroplated chromium or combined electroplating and PVD, offering superior corrosion protection with minimal coating thickness.

Item Type: Article
Erschienen: 2024
Creators: Hoche, Holger ; Ulrich, Thomas ; Kaestner, Peter ; Oechsner, Matthias
Type of entry: Bibliographie
Title: Empowering PVD for corrosion protection : TiMgGdN coatings with game‐changing corrosion performance: A genuine competitor to electroplated chromium
Language: English
Date: April 2024
Place of Publication: Weinheim
Publisher: Wiley-VCH
Journal or Publication Title: Vakuum in Forschung und Praxis
Volume of the journal: 36
Issue Number: 2
DOI: 10.1002/vipr.202400813
Corresponding Links:
Abstract:

A novel, monolithic DC‐magnetron sputtered TiN+MgGd coating, only 3 to 5 μm thick, effectively protects steel substrates from corrosion. This achievement is due to alloying of TiN with MgGd, which not only maintains the renowned wear resistance of TiN coatings, but potentially improves it through optimized deposition parameters.

The key to the enhanced corrosion resistance lies in the addition of magnesium (Mg) and gadolinium (Gd). It reduces the coating's free corrosion potential, thereby mitigating the driving force for galvanic corrosion between coating and substrate. Moreover, at specific Mg to Gd ratios, a cathodic protection effect can be observed. Crucially, the presence of Gd is essential for this performance. It imparts hydrophobicity to the coating surface, reinforces a passivating layer and significantly enhances defect tolerance.

This discovery paves the way for a sustainable alternative to electroplated chromium or combined electroplating and PVD, offering superior corrosion protection with minimal coating thickness.

Alternative Abstract:
Alternative abstract Language

PVD für den Korrosionsschutz ‐ TiMgGdN‐Beschichtungen mit bahnbrechender Korrosionsleistung: Ein echter Konkurrent für galvanisch abgeschiedenes Chrom

Die an der TU Darmstadt entwickelte TiN+MgGd‐Schicht ermöglicht einen für PVD‐Schichten einzigartigen Korrosionsschutz. Die Schutzwirkung wird bereits in dem für PVD‐üblichen Schichtdickenbereich zwischen 3 μm und 5 μm erzielt. Gleichzeitig wurde die für PVD‐TiN bekannte Verschleiβbeständigkeit aufrechterhalten, bzw. durch Anpassung der Beschichtungsparameter verbessert. Die Legierung von Magnesium (Mg) und Gadolinium (Gd) zu TiN verringert das freie Korrosionspotential der Beschichtung und reduziert damit die Triebkraft für die galvanische Korrosion zwischen Beschichtung und Substrat an Fehlstellen. Bei einem bestimmten Verhältnis von Mg zu Gd wurde ein kathodischer Schutzeffekt beobachtet. Gd ist für die Korrosionsbeständigkeit unerlässlich, da es die Oberfläche der Beschichtung hydrophob macht, eine stabile Passivschicht bildet und die Fehlstellentoleranz deutlich erhöht. Damit existiert erstmals ein PVDSchichtsystem als konkurrenzfähige und nachhaltige Alternative zu galvanischen und chemischen Beschichtungen.

German
Classification DDC: 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Center for Engineering Materials, State Materials Testing Institute Darmstadt (MPA) Chair and Institute for Materials Technology (IfW)
Date Deposited: 12 Jun 2024 14:27
Last Modified: 12 Jun 2024 14:27
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