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Preparation method for coating on electrolytic aluminum prebaked anode steel claw

A technology of prebaking anodes and anode steel claws, which is applied in the field of metallurgical materials, can solve the problems of electrolyte cryolite corrosion, high-temperature oxidation consumption of anode steel claws, etc., and achieve the effects of reducing consumption, improving comprehensive mechanical properties, and requiring less equipment

Inactive Publication Date: 2014-01-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the above-mentioned deficiencies in the prior art, and to provide a method for preparing an electrolytic aluminum prebaked anode steel claw coating, specifically a high-temperature anti-oxidation and corrosion-resistant coating using alumina as the film material. Electrolytic aluminum pre-baked anode steel claw film layer to solve the problem of high temperature oxidation consumption of anode steel claw and electrolyte cryolite corrosion

Method used

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  • Preparation method for coating on electrolytic aluminum prebaked anode steel claw

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Embodiment approach 1

[0024] Implementation mode one: if figure 1 As shown, the preparation method of the electrolytic aluminum prebaked anode steel claw coating of the present embodiment is:

[0025] (1) Grinding to remove the dirt on the surface of the anode steel claw, cleaning with 5wt% hydrochloric acid, absolute ethanol and deionized water, then drying at 20°C, and then using degreasing agent to remove oil in turn (The degreasing agent is made of the KOH of 25wt% by mass percentage, the Na of 5wt% 2 SO 4 and 15wt% Na 2 CO 3 The mixed aqueous solution prepared by adding water, the degreasing process is to keep the degreasing agent boiling for 25 minutes), acid derusting (using sulfuric acid, the concentration of sulfuric acid derusting is 20wt%, the temperature is 60 ℃, and the heating time is 12 minutes);

[0026] (2) Hot-dip aluminizing the pretreated anode steel claws: put the pretreated anode steel claws in ZnCl 2 In the solution, the pretreated anode steel claws are treated with ZnCl...

Embodiment approach 2

[0028] Implementation mode two: if figure 1 As shown, the preparation method of the electrolytic aluminum prebaked anode steel claw coating of the present embodiment is:

[0029] (1) Grinding to remove the dirt on the surface of the anode steel claw, cleaning with 5wt% hydrochloric acid, absolute ethanol and deionized water, then drying at 50°C, and then degreasing with degreasing agent in turn (The degreasing agent is made of the KOH of 15wt% by mass percentage, the Na of 10wt% 2 SO 4 and 11wt% Na 2 CO 3The mixed aqueous solution prepared by adding water, the degreasing process is to keep the degreasing agent boiling for 20 minutes), acid derusting (using sulfuric acid, the concentration used for sulfuric acid derusting is 30wt%, the temperature is 40°C, and the heating time is 15 minutes);

[0030] (2) Hot-dip aluminizing the pretreated anode steel claws: put the pretreated anode steel claws in ZnCl 2 In the solution, the pretreated anode steel claws were placed in ZnCl...

Embodiment approach 3

[0032] Implementation mode three: if figure 1 As shown, the preparation method of the electrolytic aluminum prebaked anode steel claw coating of the present embodiment is:

[0033] (1) Grinding to remove the dirt on the surface of the anode steel claw, cleaning with hydrochloric acid with a concentration of 5wt%, absolute ethanol and deionized water, then drying at 70°C, and then degreasing with degreasing agent in turn (The degreasing agent is made of the KOH of mass percentage 22wt%, the Na of 8wt% 2 SO 4 and 5wt% Na 2 CO 3 The mixed aqueous solution prepared by adding water, the degreasing process is to keep the degreasing agent boiling for 30 minutes), acid derusting (using sulfuric acid, the concentration used for sulfuric acid derusting is 22wt%, the temperature is 50 ℃, and the heating time is 10 minutes);

[0034] (2) Hot-dip aluminizing the pretreated anode steel claws: put the pretreated anode steel claws in ZnCl 2 In the solution, the pretreated anode steel cla...

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Abstract

The invention relates to a preparation method for a coating on an electrolytic aluminum prebaked anode steel claw, which belongs to the technical field of metallurgical materials. The method comprises the following steps: removing dirt on the surface of the electrolytic aluminum prebaked anode steel claw through polishing, cleaning and drying the electrolytic aluminum prebaked anode steel claw and successively removing oil by using an oil removal agent and removing rust by using acid; subjecting the pretreated electrolytic aluminum prebaked anode steel claw to hot dip aluminum plating or fused salt electrolysis titanizing; and finally, carrying out micro-arc oxidation on the electrolytic aluminum prebaked anode steel claw treated by any method in a NaSiO3 solution, NaOH solution, NaH2PO4 solution or Na2SiO3 solution by using constant-current electrolysis so as to prepare the oxidation-resistant corrosion-resistant electrolytic aluminum prebaked anode steel claw treated by using a hot dip aluminum plating or fused salt electrolysis titanizing method and a micro-arc oxidation method. The preparation method provided by the invention overcomes the problems of high-temperature oxidation consumption of the anode steel claw and corrosion of electrolyte cryolite.

Description

technical field [0001] The invention relates to a method for preparing electrolytic aluminum prebaked anode steel claw coating, which belongs to the technical field of metallurgical materials. Background technique [0002] In the production process of prebaked aluminum electrolysis, the anode steel claw is used as a conductor of strong current, and at the same time it must play the role of supporting and connecting the aluminum guide rod. Anode steel claws are not only in the air and high concentration of CO 2 In the atmosphere, it is also continuously washed by the strong corrosive electrolyte cryolite, so the anode steel claws are washed by air, CO 2 Oxidation and erosion by cryolite electrolytes occur from time to time. The oxidation of the anode steel claw consumes a large amount of steel, reduces the cross-sectional area of ​​the steel claw, increases the resistivity, and increases the energy consumption of electrolytic aluminum. The eroded steel claws and phosphorus...

Claims

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Application Information

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IPC IPC(8): C23F17/00C25C3/12
Inventor 严继康唐婉霞倪尔鑫甘国友周国琼杜景红张家敏刘意春易健宏
Owner KUNMING UNIV OF SCI & TECH
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