Preparation method of steel strip covered by ferronickel/nickel-cobalt double coatings

A technology of steel strip and nickel-cobalt, which is applied in the field of steel strip preparation, can solve problems affecting battery storage life and battery leakage, and achieve the effects of improving cracks in the coating, prolonging service life, and enhancing corrosion resistance

Inactive Publication Date: 2017-12-08
SHENZHEN ANDING NEW ENERGY TECH DEV CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

During the production process of the battery steel case, the iron components on the substrate under these cracks will gradually dissolve,...

Method used

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  • Preparation method of steel strip covered by ferronickel/nickel-cobalt double coatings

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preparation example Construction

[0018] The invention provides a method for preparing a steel strip covered by a nickel-iron / nickel-cobalt double coating, comprising the following steps:

[0019] Step 1: First mix sodium carbonate, sodium phosphate dodecahydrate, sodium silicate and sodium hydroxide with a mass ratio of 0.5-12:3-24:0.2-4:1-3 to form the first mixture, and then mix the steel The strip is placed in the first mixture, and placed at the first preset temperature for the first preset time; then the steel strip is soaked in 20vol%-45vol% sulfuric acid for the second preset time, and then at 5vol%-15vol After soaking in % sulfuric acid for a third preset time, activate it to remove the residual impurities on the surface of the steel strip to obtain the steel strip body;

[0020] Step 2: first mix nickel sulfate hexahydrate, nickel chloride hexahydrate, boric acid, and sodium lauryl sulfate with a mass ratio of 5-8:1-2:0.5-1.5:0.001-0.05 to form a second mixture, Then place the steel strip body obtai...

Embodiment

[0029] Step 1: first mix sodium carbonate, sodium phosphate dodecahydrate, sodium silicate and sodium hydroxide at a mass ratio of 0.5:3:0.2:1 to form the first mixture, then place the steel strip in the first mixture, and place it at 50°C for 20 minutes; then soak the steel strip in 20vol%-45vol% sulfuric acid for 3 minutes, then soak it in 5vol%-15vol% sulfuric acid for 8 minutes, then activate it to remove the residual impurities on the surface of the steel strip, and obtain Steel belt body.

[0030] Step 2: First mix nickel sulfate hexahydrate, nickel chloride hexahydrate, boric acid, and sodium lauryl sulfate with a mass ratio of 5:1:0.5:0.05 to form a second mixture, and then mix the steel obtained in step 1 The strip body is placed in the second mixture for the first electroplating to obtain a steel strip with a nickel-plated layer, wherein the current density of the first electroplating is 1.5A / dm 2 , PH value: 3.8, the temperature of the first electroplating: 35 ℃. ...

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PUM

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Abstract

A preparation method for a steel strip covered by a nickel-iron/nickel-cobalt double coating, comprising the following steps: Step 1: mixing sodium carbonate, sodium phosphate dodecahydrate, sodium silicate and sodium hydroxide, and placing the steel strip in the first mixture , the steel strip is soaked in sulfuric acid to activate and remove impurities; step 2: nickel sulfate hexahydrate, nickel chloride hexahydrate, boric acid, and sodium lauryl sulfate are mixed, and the steel strip body is placed in the second mixture for the first electroplating; Step 3: heat-treat the steel strip with the nickel-plated layer, mix sodium hydroxide, sodium carbonate, sodium phosphate dodecahydrate and sodium silicate, soak the steel strip with the nickel-plated layer in the third mixture, wash with water and perform cathodic activation process Removing the oxide film of the steel strip with the nickel-plated layer; step 4: mixing cobalt sulfate heptahydrate, nickel sulfate hexahydrate, sodium citrate dihydrate, boric acid, sodium dodecylsulfonate, sodium saccharin and butynediol , the steel strip substrate with the nickel-plated layer is put into the fourth mixture for the second electroplating, and is successively washed and dried.

Description

【Technical field】 [0001] The invention relates to the technical field of batteries, in particular to a method for preparing a steel strip covered with nickel-iron / nickel-cobalt double plating. 【Background technique】 [0002] At present, there are also disclosed pre-nickel plating methods for steel strips in China, but in the process of electroplating, the nickel plating methods are all carried out by a single nickel plating method, and the steel strips produced by the single nickel plating method are used to further prepare battery steel The bonding force between the plating layers of the shell is not good, and the nickel removal phenomenon of the plating layer is easy to occur. During the stretching and stamping process of the battery steel case, the nickel layer on the surface of the battery steel case is also continuously stretched and deformed, cracks will appear in the plating layer, and the original cracks and other bad points will be stretched and enlarged continuousl...

Claims

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Application Information

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IPC IPC(8): C25D5/14C25D5/36C25D7/06
CPCC25D5/14C25D5/36C25D7/0614
Inventor 钟莎莎王振峰邓昌源
Owner SHENZHEN ANDING NEW ENERGY TECH DEV CO LTD
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