TY - JOUR
T1 - Corrosion behaviour of plasma sprayed coatings
AU - Celik, E.
AU - Ozdemir, I.
AU - Avci, E.
AU - Tsunekawa, Y.
PY - 2005/4/1
Y1 - 2005/4/1
N2 - It is known that Al2O3, Al2O3 +TiO2, Cr2C3+NiCr, NiAl, NiCrAl, ZrO2 and MgZrO3 coatings are resistant to specific corrosion media which are widely employed in industry. In the material environment configuration, the component surface is a vital parameter in determining its optimum performance. For this purpose, the corrosion behaviour of ceramics, cermet and metallic coatings on AISI 304L stainless steel substrates were investigated in 1 N H2 SO4 solutions. A plasma spray process was employed on a substrate with deposition of ceramic, cermet, and metallic powders such as Al2O3, Al2O3 +TiO2, Cr2C3+NiCr, NiCrAl, ZrO2+NiAl and MgZrO3+NiAl. The porosity of coatings was measured by water impregnation, electrochemical measurements and optical methods. Potentiodynamic polarization measurements were also carried out to determine the corrosion behaviour of the plasma sprayed coatings. The microstructure of coatings and corroded coatings were investigated during the corrosion test by optical microscope, SEM and X-ray diffraction (XRD). It is concluded that the corrosion resistance depends strongly on the porosity and coating type. Besides, it was found that the corrosion resistances of Al2O3, Al2O3+TiO2, ZrO2+NiAl and MgZrO3+NiAl coatings are higher than those of Cr2 C3+NiCr, NiAl and NiCrAl coatings.
AB - It is known that Al2O3, Al2O3 +TiO2, Cr2C3+NiCr, NiAl, NiCrAl, ZrO2 and MgZrO3 coatings are resistant to specific corrosion media which are widely employed in industry. In the material environment configuration, the component surface is a vital parameter in determining its optimum performance. For this purpose, the corrosion behaviour of ceramics, cermet and metallic coatings on AISI 304L stainless steel substrates were investigated in 1 N H2 SO4 solutions. A plasma spray process was employed on a substrate with deposition of ceramic, cermet, and metallic powders such as Al2O3, Al2O3 +TiO2, Cr2C3+NiCr, NiCrAl, ZrO2+NiAl and MgZrO3+NiAl. The porosity of coatings was measured by water impregnation, electrochemical measurements and optical methods. Potentiodynamic polarization measurements were also carried out to determine the corrosion behaviour of the plasma sprayed coatings. The microstructure of coatings and corroded coatings were investigated during the corrosion test by optical microscope, SEM and X-ray diffraction (XRD). It is concluded that the corrosion resistance depends strongly on the porosity and coating type. Besides, it was found that the corrosion resistances of Al2O3, Al2O3+TiO2, ZrO2+NiAl and MgZrO3+NiAl coatings are higher than those of Cr2 C3+NiCr, NiAl and NiCrAl coatings.
KW - AISI 304L
KW - Corrosion
KW - Microstructure
KW - Plasma sprayed coatings
KW - Porosity
UR - http://www.scopus.com/inward/record.url?scp=13844274949&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2004.08.143
DO - 10.1016/j.surfcoat.2004.08.143
M3 - Article
AN - SCOPUS:13844274949
SN - 0257-8972
VL - 193
SP - 297
EP - 302
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
IS - 1-3 SPEC. ISS.
ER -