Brazing material for repairing anode steel claw and preparation method thereof

Abstract

The invention discloses a brazing material for repairing an anode steel claw and a preparation method thereof. The brazing material comprises tubular brazing filler metal and semi-ring-shaped brazingfiller metal, a corrosion section of an anode steel claw head to be repaired is cut off, a boss is machined at the lower end of the anode steel claw head to be repaired, a groove is machined in the upper end of round steel replacing the corrosion section, the tubular brazing filler metal is placed in the groove, and the semi-ring-shaped brazing filler metal is placed on the edge of the groove; thetubular brazing filler metal is formed by folding a brazing filler metal thin strip with the surface coated with a brazing flux layer for multiple times in the length direction to form short strip-shaped brazing filler metal with the brazing filler metal and brazing fluxes mutually alternately and then carrying out winding by taking a short edge as a shaft; the semi-ring-shaped brazing filler metal is formed by cutting a brazing filler metal thin strip with the surface coated with a brazing flux layer into semi-ring-shaped brazing filler strips and then carrying out multi-layer overlaying; and the brazing filler metal thin strip comprises, by weight, 50-55 parts of copper, 37.5-41 parts of zinc, 3.6-4.3 parts of manganese, 1.9-2.6 parts of cobalt, 0.7-0.95 part of iron, 1.6-1.9 parts of copper-plated graphene and 0.1-0.3 part of microelements. The brazing material is specially used for repairing the anode steel claw, the resistivity of the repaired steel claw is remarkably reduced, and the repaired steel claw is good in conductivity, high in strength, and long in service life.

Description

Technical field [0001] The invention relates to the field of metallurgical casting in the electrolytic aluminum industry, in particular to a brazing material for repairing anode steel claws and a preparation method thereof. Background technique [0002] In the modern aluminum electrolysis industry, carbon anodes are used as anodes. The anode steel claws, aluminum guide rods and anode carbon blocks constitute the anode assembly block. Between the electrolysis cell and the anode bus, a large current is carried during the aluminum electrolysis process. In the electrolysis production process, because the anode steel claw is in a corrosive atmosphere, the contact temperature of the working surface is about 350℃~900℃. Therefore, the steel claw is very vulnerable to high temperature electrolyte and extremely The corrosion of materials, air, and electrolysis flue gas, as well as the damage of thermal stress, electromagnetic force and collision force, leads to serious corrosion of the ste...

AI Technical Summary

Problems solved by technology

In the process of electrolytic production, since the anode steel claw is in a corrosive atmosphere, the working surface is exposed to a temperature of about 350°C to 900°C. material, air and electrolytic flue gas, and also bear the damage of thermal stress, electromagnetic force and collision force, resulting in severe corrosion of the steel claw. After working for a period of time, the steel claw connecting the anode carbon block will gradually become thinner. As a result, the resistance of the thinning part of the steel claw increases, the heat is serious, and the energy consumption increases. This in turn further accelerates the corrosion of the gradually thinning steel claw, resulting in an increase in the resistance of the steel claw, which increases the power consumption and affects the electrolysis. efficiency, and may break or even cause the anode carbon block to fall off because the thinned steel claw head cannot bear the weight of the anode carbon block

Therefore, when the steel claws are gradually corroded and thinned to a certain extent, they must be scrapped and replaced, which makes the consumption of the anode steel claws large, and the repair task is relatively heavy.

[0003] For a long time, domestic electrolytic aluminum enterprises have adopted the manual arc welding method for the repair of anode steel claws, that is, the traditional surrounding welding method. However, due to the limitations of the weldment groove processing and welding process, this welding method is not only inefficient, but also There are shortcomings such as small welding area, low joint strength, high resistivity, and short service life, which seriously affect and restrict the control of production costs by electrolytic aluminum enterprises

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