The effects of a CeO2 coating on the corrosion parameters of type 304 stainless steel
UNSPECIFIED. (1998) The effects of a CeO2 coating on the corrosion parameters of type 304 stainless steel. JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 7 (6). pp. 727-732. ISSN 1059-9495Full text not available from this repository.
Coatings of CeO2 derived from inorganic sol-gel dispersions were applied to type 304 bright annealed stainless steel (British Standard 1449 type 304S31) coupons and subjected to heat treatments at 450 and 550 degrees C. The coatings, 0.5 mu m thick, were transparent, adherent, and stable. The aqueous corrosion properties of the coated coupons in 1 molar NaCl were then studied by potentiodynamic polarization measurements and electrochemical impedance spectroscopy. The derived corrosion parameters were then compared with similarly heat-treated, uncoated 304SS coupons. The results indicate that the application of a CeO2 coating, heat treated at 550 degrees C, improves the corrosion rate as compared to an uncoated heat-treated coupon. The polarization curve for the 450 degrees C heat-treated, coated coupon showed passive behavior compared to transpassive for the uncoated specimen. The impedance spectrum data for the uncoated, as-received coupon could be modeled using a resistor in series with a parallel capacitor resistor combination "Randles" equivalent circuit. A coated coupon, heat treated at 550 degrees C, could be modeled using a more complex equivalent circuit involving a constant phase element, due to the CeO2 coating. Modeling of the impedance characteristics for the oxidized coupons required the addition of a second series element consisting of a parallel resistor capacitor combination to give a Chi square statistic fit of chi(2) < 5 x 10(-4).
|Item Type:||Journal Article|
|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)|
|Journal or Publication Title:||JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE|
|Number of Pages:||6|
|Page Range:||pp. 727-732|
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