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Corrosion protection of steels by PVD TaN thin films

Article Information:

Title:

Corrosion protection of steels by PVD TaN thin films

Author(s):

J.F. Flores, B. Valdez S., M. Schorr, J.J. Olaya

Journal:

Anti-Corrosion Methods and Materials

Year:

2006

Volume:

53

Issue:

2

Page:

88 - 94


ISSN:

0003-5599


DOI:

10.1108/00035590610650785

Publisher:

Emerald Group Publishing Limited

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Abstract:

Purpose – To investigate the protective properties of tantalum nitride (TaN) thin films deposited on to various steels immersed in a 3 per cent NaCl solution.

Design/methodology/approach – TaN thin films with a thickness of 250?nm were deposited on UNS G10180, UNS S30400 and UNS T11302 steels by means of magnetron sputtering technique. The electrochemical behaviour has been studied in 3 per cent NaCl solution using electrochemical impedance spectroscopy and potentiodynamic polarization. The crystalline structure of the films was investigated by X-ray diffraction. Surface analysis of the corroded samples was performed using scanning electron microscopy and light optical microscopy. The electrochemical impedance spectra were analysed in the context of equivalent circuit models (ECs).

Findings – The ECs incorporate a charge transfer process representing the TaN film on UNS G10180 steel, two time constants for that deposited on UNS T11302 and diffusion behaviour for the TaN film on UNS S30400 steel. TaN films demonstrate their protection properties, which were evidenced by increase of the electrochemical properties compared with the substrate. The major corrosion damage of coatings is caused by defects, pores, droplets and pinholes that allow the electrolyte penetration through the films.

Practical implications – Corrosion protections of steels by TaN thin films.

Originality/value – The information related to corrosion behaviour of TaN films in a chloride solution is poor. This paper presents not only a completely electrochemical characterization, but also the surface analysis of the corroded samples.

Keywords:

Coatings technology, Corrosion resistance, Steels, Vapours


Article Type:

Research paper


Article URL:

http://www.emeraldinsight.com/10.1108/00035590610650785

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