Abstract
The improvement in cyclic oxidation resistance of SUS304 stainless steel was tried by electrodeposition of Y in molten salt. Electrolysis of Y was conducted using potentiostatic polarization method in an equimolar NaCl-KCl melt containing 3.5 mol% YF3 at 1023 K. The mass of electrodeposited material increased with the passage of polarization time. The observation of specimen surface after polarization at −2.2 V (vs. Ag/Ag+ (0.1)) for 0.3 and 0.6 ks showed that Y particles were uniformly dispersed on the surface. The cyclic oxidation resistance of the electrodeposited stainless steel was remarkably improved as compared with untreated stainless steel. The scale formed on the untreated stainless steel after cyclic oxidation was thick, and had a alternate structure of Fe-oxide layer and Cr-oxide layer. On the other hand, the scale formed on the stainless steel electrodeposited at −2.2 V for 0.3 ks was extremely thin, and consisted mainly of Cr2O3.
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