Abstract
Erbium oxide (Er2O3) coating has gained much attention as an effective measure to assist in solving some destructive problems in Tokamak blanket system. In this paper, Er2O3 coatings were deposited by sol-gel method on the SUS 304 stainless steel substrate, and then immersed the coating specimens in liquid lithium at 500℃ lasting for 600 h for corrosion resistance study. The coatings prepared at different temperatures before and after corrosion were characterized by XRD and SEM for crystal structure, surface and internal stress analysis. The grain size of Er2O3 layer varied with the annealing temperature, and the bigger size can be obtained by higher temperature. Lithium corrosion resistance of coating was analyzed by Calibration free laser-induced breakdown spectroscopy (CF-LIBS) with the content ratio of erbium to lithium to analyze the depth distribution of lithium. It is conservatively estimated that when the ratio is greater than 20, lithium disappeared in the coating, and the penetration depth is less than 0.5 μm. Analysis result support the hypothesis of the mechanism of corrosion product formation and confirm the reliable resistance of coating to lithium corrosion.
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