Yttrium sol-gel coating effects on the cyclic oxidation behaviour of 304 stainless steel

The present results reveal the interest of sol-gel coating technique to improve 304 steel high temperature oxidation resistance. An yttrium sol-gel coating appears to enhance the oxidation resistance during isothermal oxidation test, to decrease widely the oxide weight gain and to reduce the initial transient oxidation stage generally observed in the case of blank steels. Moreover, the experimental results confirm that yttrium sol-gel coating also plays a significant role on the cyclic oxidation behaviour of the 304 steel. In fact, the yttrium addition promotes remarkably the prolongation of the period during which the oxide scale still remains adherent to the substrate. (C) 2003 Elsevier Ltd. All rights reserved.