Abstract
Improvement in the oxidation resistance of SUS304 stainless steel was accomplished by electrodeposition of La in a molten salt. The electrolysis of La was conducted using a potentiostatic-polarization method in an equimolar NaCl–KCl melt containing 3.5 mol. LaF 3 at 1023 K. Observation of the specimen surface after polarization at −1.8 V (vs. Ag/Ag+ (0.1)) for 0.18 ks showed that La particles were uniformly dispersed on the surface. The oxidation resistance of the electrodeposited stainless steel was significantly improved as compared with the untreated stainless steel. The scale formed on the untreated stainless steel after oxidation was thick and consisted of Fe2O3 and Fe3O4, whereas the scale formed on the elecrodeposited stainless steel was extremely thin, and mainly consisted of Cr2O3.
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