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Coating titanium electrode for metal electrodeposition and preparation method of coating titanium electrode

A titanium electrode and coating technology, which is applied in the coating process of metal materials, electrodes, coatings, etc., can solve the problems of short service life and poor corrosion resistance, and achieve high matrix strength, extended service life, and precipitation potential low effect

Inactive Publication Date: 2017-01-04
GUANGDONG INST OF RARE METALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oxygen evolution potential of the coated titanium electrode is low, and it has been used in the electroplating industry using a high-purity solution system. However, industrial electrolytes such as zinc electrolysis generally contain F -- , Mn 2+ and other impurities, resulting in poor corrosion resistance and short service life
Therefore, the current lead-based ternary alloy electrodes and iridium-tantalum-coated titanium electrodes still cannot fundamentally solve the problems existing in lead-based binary alloy anodes.

Method used

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  • Coating titanium electrode for metal electrodeposition and preparation method of coating titanium electrode
  • Coating titanium electrode for metal electrodeposition and preparation method of coating titanium electrode
  • Coating titanium electrode for metal electrodeposition and preparation method of coating titanium electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Substrate 1: Boil the pure titanium plate with 5% soda ash aqueous solution for 1 hour, wash with water, then immerse in 8% oxalic acid solution, boil for 3 hours, wash with water, rinse with deionized water, and dry at 100°C;

[0028] Intermediate layer 2: Then immerse the pure titanium plate in the electroless plating solution containing tetraacetate hexammonium platinum complex solution (5g / L as platinum) and hydrazine hydrate 5mL / L. The pH of the plating solution is 10, washed with water, rinsed with deionized water, and dried at 110°C to obtain a platinum loading of 5g / m 2 The middle layer 2;

[0029] Outer coating 3: use an outer coating liquid of 18g of chloroiridic acid, 50g of tin tetrachloride pentahydrate, 2.68g of bismuth chloride, 225mL of ethanol and 250mL of n-butanol. Use a soft brush to evenly brush the above outer layer coating solution on the middle layer 2 of the pure titanium plate, dry it at 80°C for 10 minutes, then move it into hot air at a temp...

Embodiment 2

[0035] Substrate 1: Boil the pure titanium-clad aluminum layered composite board with 5% soda ash aqueous solution for 1 hour, wash with water, then immerse in 10% oxalic acid solution, boil for 2.5 hours, wash with water, rinse with deionized water, and dry at 120°C;

[0036] Intermediate layer 2: Then immerse the cleaned pure titanium-clad aluminum laminated composite plate in the platinum coating solution, take it out after dipping, and dry it at 80°C for 10 minutes, then move it into hot air at 400°C for oxidation for 10 minutes, and then immerse it after cooling Platinum coating solution, then dry, oxidize, and cool, repeat the above process 3 times, and finally heat-treat at 400°C for 0.5h. The platinum coating solution is a chloroplatinic acid n-butanol solution with a platinum concentration of 12g / L to obtain a platinum loading 4g / m 2 The middle layer 2;

[0037] Outer coating 3: use an outer coating liquid of 10 g of chloroiridic acid, 3.23 g of ruthenium trichloride...

Embodiment 3

[0042] Substrate 1: Boil the pure titanium-clad aluminum layered composite board with 5% soda ash aqueous solution for 1 hour, wash with water, then immerse in 10% oxalic acid solution, boil for 2.5 hours, wash with water, rinse with deionized water, and dry at 120°C;

[0043] Intermediate layer 2: Next, the cleaned pure titanium-clad aluminum layered composite plate is sputter-deposited for 16 minutes under the conditions of power 100W, vacuum degree 2.0MPa, and argon pressure 2Pa, to obtain a platinum loading of 8g / m 2 The middle layer 2;

[0044] Outer coating 3: use an outer coating solution of 18g of chloroiridic acid, 19.15g of tin tetrachloride, 4.32g of manganese chloride tetrahydrate, 150mL of ethanol and 290mL of n-butanol. Use a soft brush to evenly brush the above outer layer coating solution on the middle layer 2 of the composite board, dry it at 90°C for 10 minutes, then move it into hot air at a temperature of 500°C for oxidation for 15 minutes, and then brush t...

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Abstract

The invention relates to a coating titanium electrode for metal electrodeposition and a preparation method of the coating titanium electrode and belongs to the technical fields of wet metallurgy and electrochemical industries. The coating titanium electrode comprises a matrix (1), a middle layer (2) and an outer coating (3). The preparation method comprises the following steps: boiling the matrix (1) in a soda solution and an oxalic acid solution, washing, and drying the matrix (1); preparing a platinum plating layer, a platinum coating or the middle layer (2) containing a platinum tin oxide layer by virtue one or combination of a chemical plating method, a thermal decomposition method, an electroplating method or a magnetron sputtering method; and immersing the matrix (1) into outer-layer coating liquid, coating the middle layer (2) with the outer-layer coating liquid in a dipping or brushing manner, drying, and carrying out oxidation and thermal processing, so as to prepare the outer coating (3). The coating titanium electrode has the beneficial effects that the oxygen deposition potential is low, the strength of the matrix is high, the short circuit is unlikely to occur, the cathode current efficiency is high, the chemical stability of the coating is high, and a cathode product is not polluted; and the coating titanium electrode is applicable to the metal electrodeposition in sulfuric acid solution systems containing impurities of F<-->, Mn<2+> and the like.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and electrochemical industry, and specifically relates to an oxide-coated titanium electrode provided with a platinum metal or platinum-containing tin oxide intermediate layer for metal electrowinning, electrolysis and electroplating and a preparation method thereof. Background technique [0002] Metal electrowinning is an important unit process of metal wet extraction, metal foil preparation and metal coating preparation. At present, the metal electrowinning industry generally adopts an acidic sulfate solution system, and the anode generally adopts a lead-based binary alloy anode, such as zinc electrowinning generally uses a Pb-Ag electrode. The main problems of this type of anode are: (1) The oxygen evolution potential of the anode is high, which increases the useless power consumption; (2) The lead dioxide oxide film on the surface of the anode is loose and porous, resulting in a fast c...

Claims

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Application Information

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IPC IPC(8): C25C7/02C25D17/10C23C18/44C23C18/08C25D3/52C23C14/35C23C14/16B05D7/14B05D3/04
CPCB05D3/0413B05D7/14B05D2202/35B05D2425/01C23C14/165C23C14/35C23C18/08C23C18/44C25C7/02C25D3/52C25D17/10
Inventor 蒋玉思张建华程华月肖方明王继民黄奇书
Owner GUANGDONG INST OF RARE METALS
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