Abstract

A study is made of the catalytic activity of coatings based on FeCrNiWMoCoCB metallic glasses (MGs) on a substrate of 35 steel intended for the decomposition of a methylene blue solution. Five coatings of different composition with predominantly amorphous structure are synthesized via the precipitation of MG coating via electrosparking in an environment of granules of crystalline alloys. The roughness of coatings according to Ra is 9 to 14 µm, which considerably increases the area of interaction between MGs and the methylene blue solution. Unlike tungsten and molybdenum, the presence of nickel and cobalt in the composition of the metallic glass promotes the catalytic activity of coatings. Coatings based on the Fe₃₃Cr₈Ni₈W₈Mo₈Co₈C₁₆B₁₁ composition show the best catalytic properties; the energy of activation of the self-decomposition of the methylene blue solution in the presence of hydrogen peroxide falls by 800%. It is shown that the efficiency of this catalytic system can be almost tripled by etching it in HNO₃ (30%) for 380 s, due to an increase in the porosity and specific surface area of the coating. The proposed approach can substantially reduce the cost of producing the catalytic elements of reactors via the one-stage deposition of coatings of MGs on metallic materials.

中文翻译：

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FeCrNiWMoCoCB金属玻璃涂层在金属基底上的催化活性

摘要

对基于FeCrNiWMoCoCB金属玻璃（MGs）的涂层在35钢基材上的催化活性进行了研究，该材料旨在分解亚甲基蓝溶液。通过在结晶合金颗粒环境中通过电火花沉积MG涂层来合成五种主要成分为无定形结构的不同涂层。Ra的涂层粗糙度为9至14μm，这大大增加了MG与亚甲基蓝溶液之间的相互作用面积。与钨和钼不同，金属玻璃成分中镍和钴的存在会促进涂层的催化活性。基于Fe ₃₃ Cr ₈ Ni ₈ W ₈ Mo的涂层₈ Co ₈ C ₁₆ B _11的组成表现出最好的催化性能；在过氧化氢的存在下，亚甲基蓝溶液自分解的活化能下降了800％。结果表明，由于涂层孔隙率和比表面积的增加，通过在HNO ₃（30％）中蚀刻380 s，该催化体系的效率几乎可以提高三倍。所提出的方法可以通过在金属材料上一步沉积MGs涂层来显着降低生产反应堆催化元素的成本。