A kind of preparation method of alkali metal borohydride salt

Abstract

The invention discloses a preparation method of an alkali metal silicon borohydride. The method comprises the following steps: step 1: mixing a metal melt composed of Sn, Al and Si, an alkali metal fluoride and an alkali metal fluoroborate into a mixed raw material, and introducing an inert gas to perform discharge melting; removing impurities such as inorganic substances on the surface from the melt product, to obtain a crystalline sample of a Sn-based alloy; step 2, placing the crystalline sample of the Sn-based alloy in an inert gas containing 10-20 percent by volume of hydrogen for discharge melting; step 3: placing the melt product in the second step in an ether or an alcohol, and scraping the surface powder off to form an ether or alcohol solution; step 4, performing ultrasonical vibration on the ether or alcohol solution obtained in the third step, washing, and then taking the clear liquid for recrystallization, purification, and sealed storage. The invention provides a method for preparing sodium silicon borohydride by using a Sn-based metal melt solvent and hydrogenated Na-B-Si. The alkali metal silicon borohydride as a reducing agent or a solution main solution further breaks through the bottleneck of preparation of an iron-group element auto-dissolved alloy coating by liquid deposition.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing alkali metal silicon borohydride salt. Background technique [0002] Metal-metalloid alloy coatings composed of iron group elements (Fe, Co, Ni) and metalloids (P, B, C, S, etc.) have become one of the current research hotspots due to their low cost and excellent wear and corrosion resistance. First, the research on its application is not uncommon. Proper alloying of Si elements is expected to further improve the thermal stability, corrosion resistance and self-meshing resistance of metal-metalloid alloy coatings. For example, (Fe, Co, Ni)-Si-B coating system. [0003] However, the (Fe, Co, Ni)-Si-B self-dissolving alloys widely used at present mainly adopt plasma spraying, laser cladding, surfacing welding, induction cladding, vacuum cladding or non-vacuum cladding to prepare coatings. . Compared with the melt quenching method, in NaBH 4 In the case o...

AI Technical Summary

Problems solved by technology

(Fe, Co, Ni) and metalloids (P, B, C, S, etc.) are used in metal-metalloid alloy coatings, but there is no research on alloy coatings containing Si

[0005] while in NaBH 4 When Si salts such as single salts or complex salts are used as common reducing agents in liquid phase deposition, the reduction potential is very negative, and it is difficult to co-deposit to obtain self-dissolving alloy coatings of iron group elements.