Corrosion behaviour of magnetron sputtered α- and β-Ta coatings on AISI 4340 steel as a function of coating thickness

TY - JOUR

T1 - Corrosion behaviour of magnetron sputtered α- and β-Ta coatings on AISI 4340 steel as a function of coating thickness

AU - Maeng, S.

AU - Axe, L.

AU - Tyson, T. A.

AU - Gladczuk, L.

AU - Sosnowski, M.

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 - 2006/8

Y1 - 2006/8

N2 - The corrosion behaviour of magnetron sputtered α- and β-Ta coated AISI 4340 steels was studied with potentiodynamic polarization and electrochemical impedance spectroscopy. The coating porosity was observed to decrease with increasing coating thickness. For coatings less than 10 μm thick (α- or β-Ta), porosity was significant and open pores resulted in severe localized corrosion of the steel substrate, coating delamination, and overall coating failure. Additionally, the β-Ta coatings were more susceptible than the α-phase to delamination. As for the 50 and 100 μm thick α-Ta coatings, the electrochemical impedance behaviour was comparable to that of Ta foil, demonstrating the coating viability and corrosion resistance.

AB - The corrosion behaviour of magnetron sputtered α- and β-Ta coated AISI 4340 steels was studied with potentiodynamic polarization and electrochemical impedance spectroscopy. The coating porosity was observed to decrease with increasing coating thickness. For coatings less than 10 μm thick (α- or β-Ta), porosity was significant and open pores resulted in severe localized corrosion of the steel substrate, coating delamination, and overall coating failure. Additionally, the β-Ta coatings were more susceptible than the α-phase to delamination. As for the 50 and 100 μm thick α-Ta coatings, the electrochemical impedance behaviour was comparable to that of Ta foil, demonstrating the coating viability and corrosion resistance.

KW - A. Tantalum

KW - B. Magnetron sputtering

KW - C. Coating thickness

KW - C. Corrosion behaviour

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U2 - 10.1016/j.corsci.2005.08.007

DO - 10.1016/j.corsci.2005.08.007

M3 - Article

SN - 0010-938X

VL - 48

SP - 2154

EP - 2171

JO - Corrosion Science

JF - Corrosion Science

IS - 8

ER -