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Preparation method of titanium anode with titanium-based coating

A titanium anode and coating technology, applied in the field of electrochemistry, can solve the problems of material accumulation at the pit, uneven coating, anode failure, etc., and achieve the effect of overcoming the short life of the electrode

Pending Publication Date: 2021-05-14
XIAN TAIJIN NEW ENERGY & MATERIALS SCI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, if the above two methods are used to coat the intermediate layer on the pre-treated titanium substrate, the coating will be uneven due to the accumulation of material in the sandblasting pit or the acid etching pit, the accumulation of material in the pit is serious, the intermediate layer is thicker, and the bumps It is relatively thin, so that the current at the bump position of the anode is relatively concentrated during use, causing the active layer in this area to dissolve and fall off preferentially, and eventually cause the anode to fail

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The invention provides a method for preparing a titanium-based coated titanium anode, which specifically includes the following steps:

[0026] S1. Pretreatment of titanium substrate: Cut and sandblast the titanium substrate to remove the surface oxide layer, then soak it in 20% hydrochloric acid solution for 16 hours, and finally place it in slightly boiling 10% oxalic acid solution for etching for 2 hours, Rinse with deionized water after etching, and dry for later use;

[0027] S2. The oxide intermediate layer is prepared by spraying, the intermediate layer is a tin-manganese-tantalum oxide intermediate layer, and the specific preparation steps are as follows:

[0028] S2.1, a certain amount of SnCl 4 , Mn(NO 3 ) 2 and TaCl 5 Dissolve in a mixture of n-butanol and concentrated hydrochloric acid, control the molar ratio Sn:Mn=5:1, molar ratio Sn:Ta=8:1, the total metal ion concentration is 0.25mol / L, stir evenly, and configure it as a precursor The solution is re...

Embodiment 2

[0035] The present invention also provides a method for preparing a titanium-based coated titanium anode, which specifically includes the following steps:

[0036] S1. Pretreatment of titanium substrate: Cut the titanium substrate into a 1380*260mm titanium plate, use brown corundum sandblasting until the roughness Rz>25, remove the surface oxide skin, and then ultrasonically treat it in ethanol solution for 10 minutes, and finally It is etched in a slightly boiling 10% oxalic acid solution for 3.5 hours, rinsed with deionized water after etching, and dried for later use;

[0037] S2, adopt spraying method to prepare oxide middle layer, this middle layer is iridium titanium platinum oxide middle layer, and its specific preparation steps are as follows:

[0038] S2.1, weigh a certain amount of chloroiridic acid, TaCl 5 and H 2 PtCl 6 Dissolve in the mixture of isopropanol and concentrated hydrochloric acid, control the molar ratio Ir:Ta=1:9, molar ratio Pt:Ta=1:8, the total ...

Embodiment 3

[0045] The present invention also provides a method for preparing a titanium-based coated titanium anode, which specifically includes the following steps:

[0046] S1. Pretreatment of titanium substrate: Cut the titanium substrate into a titanium plate of a certain specification, use quartz sand to sandblast until the roughness Rz>25, remove the surface oxide skin, and then ultrasonically treat it in ethanol solution for 10 minutes, and finally Place in a mixed solution formed by 10% oxalic acid solution and 2% hydrochloric acid solution for etching for 2 hours, rinse with deionized water after etching, and dry it for later use;

[0047] S2, adopt spraying method to prepare oxide middle layer, this middle layer is iridium titanium platinum oxide middle layer, and its specific preparation steps are as follows:

[0048] S2.1, weigh a certain amount of chloroiridic acid, TaCl 5 and H 2 PtCl 6 Dissolve in the mixture of isopropanol and concentrated hydrochloric acid, control th...

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Abstract

The invention belongs to the technical field of electrochemistry, and relates to a preparation method of a titanium anode with a titanium-based coating. The preparation method comprises the following steps: mixing an intermediate layer precursor metal salt with a specific solvent through an in-situ spraying method to obtain a bottom layer preparation precursor solution, spraying the precursor solution onto a 180-300 DEG C titanium substrate subjected to specific pretreatment, performing in-situ thermal decomposition on the precursor solution to form a compact oxide deposition layer, performing sintering at a high temperature to obtain a titanium substrate containing an oxide intermediate layer, and coating the surface of the titanium substrate with an iridium-tantalum noble metal catalyst layer to obtain the titanium anode with the iridium-tantalum oxide coating. According to the method, the oxide intermediate layer is prepared by combining a spraying technology with a step-by-step in-situ heat treatment method, and the noble metal catalyst layer is coated on the surface of the oxide intermediate layer so that the technical defect that the service lifetime of the electrode is short due to non-uniformity of the intermediate layer prepared by the conventional brush coating method and roll coating method is overcome.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a preparation method of a titanium-based coated titanium anode. Background technique [0002] Titanium anode is also called metal oxide electrode, which is a new type of insoluble electrode based on valve metal titanium and coated with noble metal oxide on its surface. According to the difference of its surface catalytic coating, it can be divided into two types: oxygen analysis anode and chlorine analysis anode. Among them, IrO 2 -Ta 2 o 5 / Ti anode has the advantages of small polarization, extremely low consumption rate, high conductivity, low oxygen evolution potential, strong corrosion resistance, long life, and excellent electrocatalytic activity, etc. It is widely used in electrolytic copper foil, electroplating, wet Metallurgy and sewage treatment and other fields. Due to the low adhesion and easy peeling off of the traditional noble metal anode active layer on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/12C23C18/04
CPCC23C18/1216C23C18/1291C23C18/04C23C18/1241C23C18/1225
Inventor 柴作强郝小军冯庆贾波贺斌白璐怡鲁海军孟鹏帅
Owner XIAN TAIJIN NEW ENERGY & MATERIALS SCI TECH CO LTD
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