Corrosion behaviour of electrodeposited and sputtered Cr coatings and sputtered Ta coatings with α and β phases

TY - JOUR

T1 - Corrosion behaviour of electrodeposited and sputtered Cr coatings and sputtered Ta coatings with α and β phases

AU - Maeng, S.

AU - Axe, L.

AU - Tyson, T. A.

AU - Cote, P.

N1 - Funding Information: This work was conducted by NJIT as part of the Sustainable Green Manufacturing Program, through the National Defense Center for Environmental Excellence, contract DAAE30-98-C-1050.

PY - 2006/5/22

Y1 - 2006/5/22

N2 - The corrosion behaviour of α- and β-Ta coatings was compared to that of Cr coatings produced by cylindrical magnetron sputtering as well as electrodeposition. For Ta coatings, the corrosion process was dominated by dissolution of the steel substrate through open pores, however, at the end of 5 days, coating degradation was not observed. In contrast, while open pores were not observed with the Cr coatings, the corrosion resistance decreased as a function of time under acidic conditions, as a result of the protective oxide dissolution. Initially, however, the sputtered Cr coating exhibited improved corrosion resistance over the electrodeposited one, potentially due to the surface structure of the oxide film. Both Cr coatings showed similar transpassive behaviour to that of pure Cr; the current density of the sputtered Cr coating was observed to be greater than that of the electrodeposited one in the transpassive region due to the extensive droplet-like defects.

AB - The corrosion behaviour of α- and β-Ta coatings was compared to that of Cr coatings produced by cylindrical magnetron sputtering as well as electrodeposition. For Ta coatings, the corrosion process was dominated by dissolution of the steel substrate through open pores, however, at the end of 5 days, coating degradation was not observed. In contrast, while open pores were not observed with the Cr coatings, the corrosion resistance decreased as a function of time under acidic conditions, as a result of the protective oxide dissolution. Initially, however, the sputtered Cr coating exhibited improved corrosion resistance over the electrodeposited one, potentially due to the surface structure of the oxide film. Both Cr coatings showed similar transpassive behaviour to that of pure Cr; the current density of the sputtered Cr coating was observed to be greater than that of the electrodeposited one in the transpassive region due to the extensive droplet-like defects.

KW - Chromium coating

KW - Corrosion behaviour

KW - Electrochemical impedance spectroscopy

KW - Magnetron sputtering

KW - Tantalum coating

KW - X-ray absorption spectroscopy

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U2 - 10.1016/j.surfcoat.2005.08.129

DO - 10.1016/j.surfcoat.2005.08.129

M3 - Article

SN - 0257-8972

VL - 200

SP - 5767

EP - 5777

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

IS - 20-21

ER -