Evaluation method for service life of lead-based anode material

A technology of anode material and evaluation method, which is applied in anodizing, measurement of the force of change of optical properties when the material is stressed, electrodes, etc., can solve the problem of unpredictable service life of lead-based anodes and complex application environment conditions, etc problems, to achieve the effect of low cost, simple ingredients and improved quality

Active Publication Date: 2016-05-04
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Aiming at the problems that there are many types of lead-based anodes in the market, the application environment conditions are complex, and the servic...

Method used

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  • Evaluation method for service life of lead-based anode material
  • Evaluation method for service life of lead-based anode material
  • Evaluation method for service life of lead-based anode material

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Embodiment 1

[0043] The evaluation method of the service life of the lead-based anode material of the present embodiment may further comprise the steps:

[0044] Step 1: After polishing the Pb-0.5% Ca alloy lead-based anode material with 1000# water sandpaper, use a woolen polishing cloth to polish the surface of the lead-based anode material until there is no obvious scratch, and then use acetic acid and hydrogen peroxide with a volume ratio of 2.5 The mixed solution is used to chemically treat the surface of the polished lead-based anode material;

[0045] Step 2: Using CrO 3 110g / L, H 2 SO 4 26g / L, NH 4 F is 5g / L, NaCl is 2g / L mixed solution to electrolyze the lead-based anode material, wherein, the current density of electrolysis is 25A / dm 2 , the electrolyte temperature is 40°C, and the electrolysis time is 5min, 10min, 15min, 20min, 25min and 30min;

[0046] Step 3: Use SEM to analyze the cross-section of the oxide film on the surface of the lead-based anode material under diffe...

Embodiment 2

[0059] The evaluation method of the service life of the lead-based anode material of the present embodiment may further comprise the steps:

[0060] Step 1: After the lead-based anode material of the Pb-1%Ca-1.2%Sn alloy is polished with 1200# water sandpaper, the surface of the Pb-1%Ca-1.2%Sn alloy is polished to no obvious scratches with a woolen polishing cloth trace, and then use a mixed solution of acetic acid and hydrogen peroxide with a volume ratio of 3 to chemically treat the surface of the polished lead-based anode material;

[0061] Step 2: Using CrO 3 170g / L, H 2 SO 4 18g / L, NH 4 F is 2g / L, NaCl is 3g / L mixed solution to electrolyze Pb-1%Ca-1.2%Sn alloy lead-based anode material, wherein, the current density of electrolysis is 35A / dm 2 , the electrolyte temperature is 50°C, and the electrolysis time is 5min, 10min, 15min, 20min, 25min and 30min;

[0062] Step 3: Use SEM to analyze the cross-section of the oxide film on the surface of the lead-based anode mater...

Embodiment 3

[0074] The evaluation method of the service life of the lead-based anode material of the present embodiment may further comprise the steps:

[0075] Step 1: after the lead-based anode material of Pb-1.2%Sn-0.5%Ag alloy is polished by 1400# water sandpaper, the surface of the lead-base anode material of Pb-1.2%Sn-0.5%Ag alloy is treated with wool polishing cloth Polishing until there are no obvious scratches, and then using a mixed solution with a volume ratio of acetic acid and hydrogen peroxide of 4 to chemically treat the surface of the polished lead-based anode material;

[0076] Step 2: Using CrO 3 190g / L, H 2 SO 4 12g / L, NH 4 F is 4g / L, NaCl is 3g / L mixed solution to electrolyze Pb-1%Sn-0.3%Ag alloy lead-based anode material, wherein, the current density of electrolysis is 40A / dm 2 , the electrolyte temperature is 60°C, and the electrolysis time is 5min, 10min, 15min, 20min, 25min and 30min;

[0077] Step 3: Use SEM to analyze the cross-section of the oxide film on the...

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Abstract

The invention provides an evaluation method for the service life of a lead-based anode material, and belongs to the field of hydrometallurgy. The evaluation method for the service life of the lead-based anode material comprises the following steps that 1, the lead-based anode material is processed through the methods of polishing and chemical processing, and it is ensured that the surface of the lead-based anode material is free of obvious scratches; 2, electrolytic treatment is conducted on the lead-based anode material through a solution containing CrO3, H2SO4, NaCl and NH4F; 3, the thicknesses of oxidation films within different processing time are analyzed through SEM; 4, the internal stress of the oxidation films of different thickness is determined by using a Raman spectrographic method and an XRD analysis method; 5, the relationship between the stress sigma and the oxidation film thickness X is built, that is, sigma=AX+B; and 6, the service life of the lead-based anode material is evaluated according to the stress gradient A. According to the evaluation method for the service life of the lead-based anode material, the service life of the lead-based anode material can be evaluated easily, conveniently, rapidly and accurately, the economical and practical effects are achieved, and the cost is low; it is conducive to master the using and replacing periodicity of a lead anode in the electrolysis industry and the electroplating industry, continuous production is ensured, and the quality of cathode products is improved.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, in particular to a method for evaluating the service life of lead-based anode materials. Background technique [0002] Lead-based anode materials have (1) good electrical conductivity; (2) strong corrosion resistance; (3) good mechanical strength and processing performance; (4) long service life and low cost; Electrocatalytic performance and other characteristics, it not only has an important application in the field of tin-free steel electroplating, but also in the field of hydrometallurgy such as electroplating tin (or zinc), lead-acid batteries, electrolysis (zinc, copper, manganese, etc.) and chlor-alkali industry Wide range of applications. In these fields of hydrometallurgy, the lead-based anode material under the action of an electric field will serve for a long time in a relatively harsh solution environment (as short as 3-6 months, as long as 24 months or longer), such as a strong acid so...

Claims

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Application Information

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IPC IPC(8): C25C7/02C25C7/06C25D17/10C25D21/00C25D11/34G01L1/24G01L1/25
CPCC25C7/02C25C7/06C25D17/10C25D21/00G01L1/24G01L1/25
Inventor 李建中王运凯毕营杨中东田彦文
Owner NORTHEASTERN UNIV
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