TY - JOUR
T1 - Electrochemical behaviour of ceramic yttria stabilized zirconia on carbon steel synthesized via sol-gel process
AU - Crespo, M. A.Domínguez
AU - Murillo, A. García
AU - Torres-Huerta, A. M.
AU - Yañez-Zamora., C.
AU - Carrillo-Romo, F. de J.
N1 - Funding Information:
The authors wish to thank the financial support from SIP-IPN and SEP- CONACYT trough the projects 20080805, 20080654 and 2006-01-61354, respectively.
PY - 2009/8/26
Y1 - 2009/8/26
N2 - Chromate conversion coatings have been widely applied for the corrosion of different metallic substrates. However, the waste containing Cr6+ has many limitations due to the environmental consideration and health hazards. An interesting alternative seems to be the deposition on metallic surface of thin layers of yttria or zirconia or both by the sol-gel process. In this study, Ytttria and Yttria stabilized zirconia (YSZ, 8% Y2O3) thin films were used for coating commercial carbon steel substrates by sol-gel method and the dip-coating process. The evolution of organic compounds up to crystallization process as a function of heat treatments was study by FT-IR spectroscopy. The structure and morphology of the coatings were analysed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The anticorrosion performance of the coatings has been evaluated by using electrochemical techniques in an aggressive media (3.5 wt.% NaCl). The corrosion behaviour of sol-gel method was compared with traditional chromate conversion coatings. Differences in the electrochemical behaviour of YSZ coatings are related to the development of microcracks during the sintering process and to the presence of organic compounds during growth film. Electrochemical results showed that sol-gel YSZ and Y2O3 coatings can act as protective barriers against wet corrosion; however yttria films displayed low adhesion to substrate. The corrosion parameters provide an explanation of the role of each film and show a considerable increase in the corrosion resistance for coated samples in comparison to the bare steel samples.
AB - Chromate conversion coatings have been widely applied for the corrosion of different metallic substrates. However, the waste containing Cr6+ has many limitations due to the environmental consideration and health hazards. An interesting alternative seems to be the deposition on metallic surface of thin layers of yttria or zirconia or both by the sol-gel process. In this study, Ytttria and Yttria stabilized zirconia (YSZ, 8% Y2O3) thin films were used for coating commercial carbon steel substrates by sol-gel method and the dip-coating process. The evolution of organic compounds up to crystallization process as a function of heat treatments was study by FT-IR spectroscopy. The structure and morphology of the coatings were analysed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The anticorrosion performance of the coatings has been evaluated by using electrochemical techniques in an aggressive media (3.5 wt.% NaCl). The corrosion behaviour of sol-gel method was compared with traditional chromate conversion coatings. Differences in the electrochemical behaviour of YSZ coatings are related to the development of microcracks during the sintering process and to the presence of organic compounds during growth film. Electrochemical results showed that sol-gel YSZ and Y2O3 coatings can act as protective barriers against wet corrosion; however yttria films displayed low adhesion to substrate. The corrosion parameters provide an explanation of the role of each film and show a considerable increase in the corrosion resistance for coated samples in comparison to the bare steel samples.
KW - Corrosion
KW - Electrochemical impedance spectroscopy
KW - Sol-gel processes
KW - Thin films
UR - http://www.scopus.com/inward/record.url?scp=69249220202&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2008.08.086
DO - 10.1016/j.jallcom.2008.08.086
M3 - Artículo
SN - 0925-8388
VL - 483
SP - 437
EP - 441
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 1-2
ER -