论文部分内容阅读
采用室温熔盐电镀-热处理-氧化复合新技术在HR-2不锈钢上制备FeAl/Al2O3涂层,研究热处理温度与时间的影响,并表征涂层的形貌和性能。结果表明:25℃下,采用AlCl3-MEIC(氯化1-甲基3-乙基咪唑)室温熔盐在HR-2钢表面获得结合良好的纯铝镀层,电沉积速率为15μm/h。650～750℃热处理1～30h,在HR-2钢表面制得成分渐变、冶金结合、无缝隙与裂纹的3～27μm铝化物涂层,涂层截面为3层或2层结构;涂层生长速率与热处理温度的关系符合Arrhenius公式,活化能为116.9kJ/mol;涂层的形成过程受原子扩散过程控制,其厚度随热处理时间变化呈抛物线关系。700℃,4h热处理涂层在10-2PaO2中继续氧化80h后,最终涂层由约30μm厚的FeAl扩散层及约110nm的γ-A12O3膜组成,600℃下该涂层使HR-2不锈钢的氘渗透率降低3个数量级;涂层可抗750℃～室温冷热循环20次以上。该方法有望成为ITER中氚包容容器表面阻氚层的候选制备新方法。
The FeAl / Al2O3 coating was prepared on HR-2 stainless steel by room temperature molten salt electroplating-heat treatment-oxidation complex technology to study the influence of heat treatment temperature and time, and characterize the morphology and properties of the coating. The results showed that the pure aluminum coating was obtained on the surface of HR-2 steel by using AlCl3-MEIC (1-methyl 3-ethylimidazolium chloride) molten salt at 25 ℃. The electrodeposition rate was 15μm / h. Heat treatment at 650-750 ℃ for 1 ~ 30h, the composition of the gradual change in the HR-2 steel, metallurgical bonding, seamless and crack 3 ~ 27μm aluminide coating, the coating cross-section of 3 or 2 layer structure; coating growth The relationship between the rate and the heat treatment temperature accords with the Arrhenius formula, and the activation energy is 116.9kJ / mol. The formation process of the coating is controlled by the atomic diffusion process. The thickness of the coating is parabolic with the time of heat treatment. 700 ℃, 4h heat treatment coating Continued oxidation in 10-2PaO2 80h, the final coating by the about 30μm thick FeAl diffusion layer and about 110nm γ-A12O3 film composition, the coating at 600 ℃ HR-2 stainless steel Deuterium permeability decreased by 3 orders of magnitude; the coating is resistant to 750 ° C ~ room temperature hot and cold cycles more than 20 times. This method is expected to become a new candidate method for preparing tritium-blocking layer on tritium-containing containers in ITER.