Method for improving corrosion resistance of cathode aluminum plate for zinc electrolysis

A cathode aluminum plate, corrosion-resistant technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve problems such as uneven corrosion surface, affect electrolysis efficiency, electrolytic zinc quality, increase production cost, etc., and achieve the effect of improving corrosion resistance

Active Publication Date: 2011-10-05
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the surface corrosion of the aluminum cathode plate is not uniform corrosion, and its corroded surface is uneven, which affects the electrolysis efficiency and the quality of electrolytic zinc. In addition, the corrosion consumption of the aluminum cathode plate will also speed up the replacement frequency of the aluminum cathode plate, thereby increasing the production cost of the enterprise

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A two-roll irreversible and intermittent rolling mill is adopted, the roll diameter is φ530mm, the roll length is 1550mm, and the rolling speed is 40m / min. Aluminum is pure aluminum (label 1070), rolling oil base oil and additives. The base oil is a lubricating oil with a distillation range of 225.7-243.3°C, and its closed flash point is 95°C. The additives are methyl hexadecanoate and Dialkyl phosphate ester, base oil: methyl hexadecanoate: dodecyl phosphate ester composition mass ratio is 100:3:1, after aluminum plate rolling, treat with 80°C, concentration is 1% sodium silicate solution for 5 minute. After the aluminum plate product is sampled, use a roughness meter to measure the roughness (Ra) to measure its surface roughness and corrosion resistance, and compare it with the aluminum plate processed by the original process. The surface roughness Ra (μm) along the rolling direction and perpendicular to the rolling direction was improved from 0.097 and 0.109 to 0.06...

Embodiment 2

[0020] Using the above rolling conditions and aluminum material, the base oil remains unchanged, the additives are methyl octadecanoate and dodecyl phosphate, and the composition ratio of rolling oil is: base oil: methyl octadecanoate: dodecane The composition mass ratio of base phosphate is 100:5:1, and the aluminum plate is treated with 2% sodium silicate solution at 90° C. for 3 minutes after rolling. The surface roughness Ra (μm) along rolling direction and vertical rolling direction is improved from 0.097 and 0.109 to 0.062 and 0.063 respectively. The aluminum plate sample was soaked in electrolytic zinc solution (40°C), and its corrosion resistance increased by 3.1 times (from 26h to 80.6h).

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Abstract

The invention discloses a method for improving the corrosion resistance of a cathode aluminum plate for zinc electrolysis, which comprises the steps of rolling with rolling oil of particular composition formula and treatment after rolling the aluminum plate. The composition formula of the rolling oil consists of basic oil and additives, wherein the basic oil is of lubricant with the boiling rangeof 225.7 to 243.3 DEG C, flash point of the lubricant is 95 DEG C, the viscosity (at the temperature of 40 DEG C) is 1.9 to 2.0 mm2 / s, the additives are of methyl alkanes and dodecyl phosphate, the composition ratio of the basic oil, the methyl alkanes and dodecyl phosphate is 100: 3: 1 to 100: 8:1, the aluminum plate after being rolled is processed by sodium silicate solution with the concentration of 0.5 to 2 percent at the temperature of 70 to 0 DEG C for 2 to 10 minutes, and the service life can be improved by more than three times.

Description

technical field [0001] The invention belongs to the field of metal material surface treatment, and in particular relates to a method for improving the corrosion resistance of a cathode aluminum plate used for zinc electrolysis. Background technique [0002] Electrolytic deposition zinc smelting is one of the main methods of producing refined zinc at present. During electrolytic deposition zinc smelting, the cathode plate and anode plate are immersed in zinc sulfate solution. When direct current is applied, cations move to the cathode, and the positively charged Zn 2+ It accepts two electrons and discharges on the cathode to become elemental zinc, which is precipitated in a crystalline state on the surface of the cathode. [0003] Cathodic reaction: Zn 2+ +2e=Zn (1) [0004] At the same time the anions move towards the anode, the negatively charged OH - The loss of two electrons discharges at the anode and produces oxygen. [0005] Anode reaction: H 2 O-2e=0.5O 2 +2H +...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C7/02C25C1/16
CPCY02P10/20
Inventor 满瑞林周亚军蒋丰产陈智斌刘红健
Owner CENT SOUTH UNIV
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