TY - JOUR
T1 - Effect of Al additions in WC-(Cr1-xAlx)N coatings on the corrosion resistance of coated AISI D2 steel in a deaerated 3.5 wt.% NaCl solution
AU - Lee, J. H.
AU - Ahn, S. H.
AU - Kim, J. G.
PY - 2005/1/21
Y1 - 2005/1/21
N2 - Multilayered WC-(Cr1-xAlx)N coatings were deposited on AISI D2 steel using cathodic arc ion plating (CAIP) process. Five kinds of WC-(Cr1-xAlx)N coatings were prepared: WC-Cr0.6Al0.4N, WC-Cr0.57Al0.43N, WC-Cr0.53 Al0.47N, WC-Cr0.48Al0.52N and WC-Cr0.45Al0.55N. The Al concentration could be controlled by using evaporation source for Al targets and fixing the evaporation rate of the other metals (WC alloy and Cr). In this study, the corrosion behavior in deaerated 3.5 wt.% NaCl solution was investigated by electrochemical corrosion tests (potentiodynamic polarization test, galvanic corrosion test, electrochemical impedance spectroscopy (EIS)) and surface analyses (glow discharge optical emission spectroscopy, X-ray diffractometry, scratch adhesion test, scanning electron microscopy, electron probe micro-analyzer). The results of potentiodynamic polarization test showed that the WC-Cr0.48Al0.52N coating with lower porosity exhibited the lower corrosion current density. The galvanic corrosion current between the coating and the substrate showed low values. In EIS measurements, the charge transfer resistance (Rct) value of WC-Cr0.48Al0.52N coating only increased with the immersion time, when compared to the other coatings. It can be due to the corrosion products plugging the pores and increasing the pathway resistance.
AB - Multilayered WC-(Cr1-xAlx)N coatings were deposited on AISI D2 steel using cathodic arc ion plating (CAIP) process. Five kinds of WC-(Cr1-xAlx)N coatings were prepared: WC-Cr0.6Al0.4N, WC-Cr0.57Al0.43N, WC-Cr0.53 Al0.47N, WC-Cr0.48Al0.52N and WC-Cr0.45Al0.55N. The Al concentration could be controlled by using evaporation source for Al targets and fixing the evaporation rate of the other metals (WC alloy and Cr). In this study, the corrosion behavior in deaerated 3.5 wt.% NaCl solution was investigated by electrochemical corrosion tests (potentiodynamic polarization test, galvanic corrosion test, electrochemical impedance spectroscopy (EIS)) and surface analyses (glow discharge optical emission spectroscopy, X-ray diffractometry, scratch adhesion test, scanning electron microscopy, electron probe micro-analyzer). The results of potentiodynamic polarization test showed that the WC-Cr0.48Al0.52N coating with lower porosity exhibited the lower corrosion current density. The galvanic corrosion current between the coating and the substrate showed low values. In EIS measurements, the charge transfer resistance (Rct) value of WC-Cr0.48Al0.52N coating only increased with the immersion time, when compared to the other coatings. It can be due to the corrosion products plugging the pores and increasing the pathway resistance.
KW - CAIP
KW - EIS
KW - EPMA
KW - Galvanic corrosion test
KW - Multilayered coating
KW - Porosity
KW - Potentiodynamic polarization test
UR - https://www.scopus.com/pages/publications/10244267575
U2 - 10.1016/j.surfcoat.2004.03.054
DO - 10.1016/j.surfcoat.2004.03.054
M3 - Article
AN - SCOPUS:10244267575
SN - 0257-8972
VL - 190
SP - 417
EP - 427
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
IS - 2-3
ER -