Addition composition for inhibiting pores of electrodeposited nickel

Abstract

The invention relates to the technical field of electrodeposited nickel production, and provides an electrodeposited nickel pore inhibition adding composition which can simultaneously solve the technical problems of pores, acid mist and surface quality in the electrodeposited nickel production process. The composition is prepared from the following components in parts by weight: 0.03 to 0.08 part of anionic surfactant; 0.1 to 0.2 part of a nonionic surfactant; 0.01 to 0.03 part of a hydrogen inhibiting agent; and 1-5 parts of a grain refiner.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic nickel production, and in particular to an electrolytic nickel pore inhibition additive composition. Background Art

[0002] The main problems encountered in the production process of electrolytic nickel are pores and acid mist. The generation of pores on the surface of nickel plates is related to factors such as hydrogen precipitation, current density, electrolyte temperature, organic matter (such as oil) inclusions, etc. Generally, the formation of pores is suppressed by adding surfactants, controlling current density and electrolyte temperature, filtering electrolyte, adding emulsifiers, etc. to ensure the appearance quality of nickel plates. The generation of acid mist is related to factors such as hydrogen and oxygen precipitation, current density, electrolyte temperature, etc. Generally, the formation of acid mist is suppressed by adding acid mist inhibitors, controlling current density and electrolyte temperature, etc., or the acid mist is recycled and reused through equipment modification.

[0003] In actual application, we found that adding surfactants, emulsifiers, acid mist inhibitors and other additives to the electrolyte on the basis of controlling current density and electrolyte temperature can solve the problems of pores and acid mist at the same time, but the surface quality of the nickel plate is poor and the glossiness is reduced. This problem can be improved by reducing the addition of acid mist inhibitors, but it will lead to the generation of acid mist.

[0004] To this end, we propose an electrodeposition nickel pore inhibition additive composition. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] The invention provides an electrolytic nickel pore inhibition additive composition, which overcomes the shortcomings of the prior art and can simultaneously solve the technical problems of pores, acid mist and surface quality in the electrolytic nickel production process.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] An electrolytic nickel pore inhibition additive composition, characterized in that it comprises the following components in parts by weight:

[0010] Anionic surfactant 0.03-0.08 parts;

[0011] Nonionic surfactant 0.1-0.2 parts;

[0012] 0.01-0.03 parts of hydrogen inhibitor;

[0013] Grain refiner 1-5 parts.

[0014] Furthermore, the anionic surfactant is selected from any one or a combination of two or more of sodium lauryl sulfate, sodium fatty alcohol ether sulfate, sodium stearate, and sulfosuccinate.

[0015] Furthermore, the anionic surfactant includes sodium lauryl sulfate and sodium fatty alcohol ether sulfate, the weight ratio of sodium lauryl sulfate to sodium fatty alcohol ether sulfate is 2-3:1, and the weight ratio of the anionic surfactant to the nonionic surfactant is 1:5-8.

[0016] Furthermore, the nonionic surfactant is selected from any one or a combination of two or more of polyethylene glycol, polyoxyethylene fatty alcohol ether, polyoxyethylene castor oil, polyoxyethylene nonylphenol ether and ethoxylated fatty amine.

[0017] Furthermore, the hydrogen inhibitor is selected from any one or a combination of two or more of benzotriazole, thiourea, N,N-dimethylformamide, formamide, sodium nitrate, ethylenediaminetetraacetic acid and acetylene compounds.

[0018] Furthermore, the grain refiner is selected from cobalt nitrate, thiourea, sodium benzenesulfinate, dimethyl disulfide, or any one thereof or a combination of two or more thereof.

[0019] Preferably, the anionic surfactant is 0.03 parts of sodium lauryl sulfate and 0.01 parts of sodium fatty alcohol ether sulfate;

[0020] The nonionic surfactant is 0.2 parts of polyethylene glycol;

[0021] The hydrogen inhibitor is 0.03 parts of benzotriazole;

[0022] The grain refiner is 4 parts of cobalt nitrate.

[0023] (III) Beneficial effects

[0024] The present invention provides an electrolytic nickel pore inhibition additive composition, which has the following beneficial effects:

[0025] (1) Surfactants can reduce the surface tension of the electrolyte, help bubbles escape quickly from the electrode surface, reduce the retention of bubbles in the deposited layer, and thus reduce the formation of pores. In the present application, the surfactants selected are anionic surfactants and nonionic surfactants. Sodium lauryl sulfate can effectively reduce interfacial tension, control the size and generation rate of bubbles, sodium fatty alcohol ether sulfate has good foam control ability, can reduce pore formation, and help reduce the generation of acid mist. Polyethylene glycol as a nonionic surfactant can not only reduce liquid adhesion when bubbles rise, but also control liquid splashing when bubbles burst by increasing the viscosity of the electrolyte, thereby reducing acid mist generation. When sodium lauryl sulfate, sodium fatty alcohol ether sulfate and polyethylene glycol are used in combination, while reducing pores, they can form liquid surface foam on the surface of the electrolyte to inhibit acid mist, and increase the viscosity of the electrolyte, thereby reducing the use of acid mist inhibitors and ensuring the surface gloss of the nickel plate.

[0026] (2) Hydrogen inhibitors can inhibit the occurrence of hydrogen evolution reaction, reduce the evolution of hydrogen, and thus reduce the retention of hydrogen in the metal deposition layer to form pores.

[0027] (3) Grain refiners can promote the refinement of metal grains, making the deposited layer denser and more uniform, thereby reducing the formation of pores. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1

[0030] An electrolytic nickel pore inhibition additive composition comprises the following raw materials in parts by weight:

[0031] The anionic surfactant sodium lauryl sulfate 0.03 parts, fatty alcohol ether sodium sulfate 0.01 parts

[0032] 0.2 parts of the nonionic surfactant polyethylene glycol;

[0033] 0.03 parts of the hydrogen inhibitor benzotriazole;

[0034] The grain refiner is 4 parts of cobalt nitrate.

[0035] Example 2

[0036] The application of the above-mentioned electrolytic nickel pore suppression additive,

[0037] Equipment such as the electrolytic deposition tank should be cleaned and degreased in advance to reduce the impact of oil on pores.

[0038] Ni was prepared by nickel sulfate hexahydrate and deionized water 2+ The concentration of the electrolytic solution is 60g / L, and boric acid is added to control the pH to 2-4;

[0039] The above-mentioned electrolytic nickel pore suppression additive composition is added into the electrolytic solution, while mechanical stirring is performed.

[0040] The electrolytic cell voltage is 3V, the electrolytic solution temperature is 50°C (when the electrolysis temperature exceeds 50°C, for example, 65°C, the sodium fatty alcohol ether sulfate needs to be replaced with sodium stearate), and the electrolytic current density is 350A / m 2 , stirring intensity is 200 rpm, and electrodeposition is carried out for 5 hours to obtain a cathode nickel plate.

[0041] The concentrations of the components of the compositions added in the solutions of the embodiments and control examples are as follows:

[0042]

[0043] Pore ​​analysis of nickel plates obtained by various examples and control treatments:

[0044]

[0045] Note: Untreated means that no composition of each example or control is added to the electrolytic solution.

[0046] Number of pores: Scanning electron microscope (SEM) analysis shows that the number of pores per square millimeter of the surface is reduced from 25 to 2-3 after Examples 1 and 2, and the number of pores of the nickel plates after each control treatment is as high as 5-14, which is significantly more than that of Examples 1 and 2. At the same time, the anionic surfactant is selected from sodium lauryl sulfate and sodium fatty alcohol ether sulfate, and the ratio of the two is within the range of 2-3:1, which can further control the number of pores.

[0047] Pore ​​diameter: The pore diameter of the nickel plate treated in Example 1 is significantly reduced.

[0048] Analysis of anode acid mist emission after treatment in various embodiments and controls:

[0049]

[0050] Note: Untreated means that no composition of each example or control is added to the electrolytic solution.

[0051] It can be seen from the above data that each embodiment and control has significant effects in solving the problems of pores and acid mist. The characterization data of Examples 1 and 2 show that they have the best effect in reducing pores and improving gloss, and the emission of acid mist is also more effectively controlled. Compared with Example 1, the control 4 with the addition of an equal amount of non-ionic surfactant has a surface gloss equivalent to that of Example 1, but the acid mist emission is improved. Compared with Example 1, the control 5 with the addition of an equal amount of anionic surfactant has a decreased surface gloss and an increased acid mist emission.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrolytic nickel pore suppression additive composition, characterized in that: By weight, it includes the following components: Anionic surfactant 0.03-0.08 parts; Nonionic surfactant 0.1-0.2 parts; 0.01-0.03 parts of hydrogen inhibitor; Grain refiner 1-5 parts.

2. The electrolytic nickel pore inhibiting additive composition according to claim 1, characterized in that: The anionic surfactant is selected from any one or a combination of two or more of sodium lauryl sulfate, sodium fatty alcohol ether sulfate, sodium stearate, and sulfosuccinate.

3. The electrolytic nickel pore inhibiting additive composition according to claim 2, characterized in that: The anionic surfactant comprises sodium lauryl sulfate and sodium fatty alcohol ether sulfate, the weight ratio of the sodium lauryl sulfate to the sodium fatty alcohol ether sulfate is 2-3:1, and the weight ratio of the anionic surfactant to the nonionic surfactant is 1:5-8.

4. The electrolytic nickel pore inhibiting additive composition according to claim 1, characterized in that: The nonionic surfactant is selected from any one or a combination of two or more of polyethylene glycol, polyoxyethylene fatty alcohol ether, polyoxyethylene castor oil, polyoxyethylene nonylphenol ether and ethoxylated fatty amine.

5. The electrolytic nickel pore inhibiting additive composition according to claim 1, characterized in that: The hydrogen inhibitor is selected from any one or a combination of two or more of benzotriazole, thiourea, N,N-dimethylformamide, formamide, sodium nitrate, ethylenediaminetetraacetic acid and acetylene compounds.

6. The electrolytic nickel pore inhibiting additive composition according to claim 1, characterized in that: The grain refiner is selected from cobalt nitrate, thiourea, sodium benzenesulfinate, dimethyl disulfide, or any one thereof or a combination of two or more thereof.

7. The electrolytic nickel pore suppression additive composition according to claim 1, characterized in that: The anionic surfactant is 0.03 parts of sodium lauryl sulfate and 0.01 parts of sodium fatty alcohol ether sulfate; The nonionic surfactant is 0.2 parts of polyethylene glycol; The hydrogen inhibitor is 0.03 parts of benzotriazole; The grain refiner is 4 parts of cobalt nitrate.

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