阅读说明：本技术 一种铁基体化学褪镍剂及褪镍方法 (Chemical nickel removing agent and method for iron matrix ) 是由 周群飞 童江锦 于 2020-06-02 设计创作，主要内容包括：本发明提供了一种铁基体化学褪镍剂,包括：5～10wt％的过硫酸钠,4～8wt％的柠檬酸钠,5～8wt％的甘氨酸,0.4～1wt％的烷基糖苷,10～16wt％的单乙醇胺,5～8wt％的磷酸,0.1～0.3wt％的六次甲基四胺和苯骈三氮唑,水余量。本申请还提供了一种褪镍方法。本申请提供的铁基体化学褪镍剂环保型好、褪镍效果好且不会对铁基体造成腐蚀。(The invention provides a chemical nickel removing agent for an iron matrix, which comprises the following components: 5-10 wt% of sodium persulfate, 4-8 wt% of sodium citrate, 5-8 wt% of glycine, 0.4-1 wt% of alkyl glycoside, 10-16 wt% of monoethanolamine, 5-8 wt% of phosphoric acid, 0.1-0.3 wt% of hexamethylenetetramine and benzotriazole, and the balance of water. The application also provides a nickel stripping method. The chemical nickel removing agent for the iron matrix provided by the application is environment-friendly, good in nickel removing effect and free of corrosion to the iron matrix.)

1. A chemical nickel-removing agent for an iron matrix comprises:

the balance being water.

2. The chemical nickel-removing agent for iron matrix according to claim 1, wherein the mass ratio of hexamethylene tetramine to benzotriazole is (0.9-1.2): 1.

3. the chemical nickel-removing agent for the iron matrix according to claim 1, wherein the content of the sodium persulfate is 6-8 wt%.

4. The chemical plating remover of the iron matrix according to claim 1, wherein the content of the sodium citrate is 5-7 wt%.

5. The chemical deplating agent for iron matrix according to claim 1, wherein the glycine content is 6-7 wt%.

6. The chemical deplating agent for the iron matrix according to claim 1, wherein the content of the monoethanolamine is 12-14 wt%.

7. The chemical plating remover for iron matrix according to claim 1, wherein the content of alkyl glycoside is 0.6-0.9 wt%.

8. The chemical deplating agent for the iron matrix according to claim 1, wherein the chemical deplating agent for the iron matrix comprises: 8 wt% of sodium persulfate, 5 wt% of sodium citrate, 7 wt% of glycine, 14 wt% of monoethanolamine, 0.6 wt% of alkyl glycoside, 6 wt% of phosphoric acid, 0.2 wt% of a mixture of hexamethylene tetramine and benzotriazole, and the balance of water.

9. The deplating method comprises the following steps:

heating the iron matrix chemical deplating agent of any one of claims 1 to 8;

the iron matrix with the nickel plating layer is placed in a heated chemical deplating agent for deplating the iron matrix and then washed by water.

10. The deplating method according to claim 9, wherein the heating temperature is 50-100 ℃, and the deplating time is 2-6 hours.

Technical Field

The invention relates to the technical field of electroplated nickel layers, in particular to a chemical nickel removing agent and a chemical nickel removing method for an iron matrix.

Background

In the production process of the grinding wheel rod, a nickel layer needs to be electroplated on the surface of the grinding wheel rod, but poor products can be generated by electroplating, and a plating layer can be deposited on a hanger for supporting a plated part; the former needs to be recycled, and the latter needs to be reused, so that the plating layer needs to be thoroughly removed.

At present, a reagent for removing a nickel layer generally adopts nitric acid with the concentration of 65-85%, the method has the advantages of high nickel removing speed and low cost, but toxic yellow brown nitrogen dioxide gas is generated in the removing process to pollute the environment, meanwhile, concentrated nitric acid is volatile acid, is high in corrosivity and harms the health of operators, and an additional air draft device or a nitric acid inhibitor is required to be arranged during removing. The cyanide process adopts sodium cyanide or potassium cyanide as complexing agent, sodium m-nitrobenzenesulfonate as main deplating salt and other auxiliary salts as corrosion inhibitor, accelerator, etc. Since this method requires the use of higher cyanide and sodium m-nitrobenzenesulfonate, the following problems may occur during the use: cyanide is extremely toxic, nitrobenzene derivatives are also toxic and difficult to degrade, the body and the natural environment of workers are greatly damaged, the requirements of safety and environmental protection are not met, waste water treatment is difficult, and the cost of factories is increased. Therefore, it is necessary to provide a chemical deplating agent which is environmentally friendly and can be used for deplating cleanly.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a chemical nickel-removing agent for an iron matrix, which is environment-friendly and good in nickel-removing effect and can not corrode the iron matrix.

In view of the above, the present application provides a chemical nickel-removing agent for an iron matrix, comprising:

0.1-0.3 wt% of hexamethylenetetramine and benzotriazole;

the balance being water.

Preferably, the mass ratio of the hexamethylene tetramine to the benzotriazole is (0.9-1.2): 1.

preferably, the content of the sodium persulfate is 6-8 wt%.

Preferably, the content of the sodium citrate is 5-7 wt%.

Preferably, the glycine content is 6-7 wt%.

Preferably, the content of the monoethanolamine is 12-14 wt%.

Preferably, the content of the alkyl glycoside is 0.6-0.9 wt%.

Preferably, the iron matrix chemical deplating agent comprises: 8 wt% of sodium persulfate, 5 wt% of sodium citrate, 7 wt% of glycine, 14 wt% of monoethanolamine, 0.6 wt% of alkyl glycoside, 6 wt% of phosphoric acid, 0.2 wt% of a mixture of hexamethylene tetramine and benzotriazole, and the balance of water.

The application also provides a deplating method, which comprises the following steps:

heating the chemical deplating agent for the iron matrix in the scheme;

the iron matrix with the nickel plating layer is placed in a heated chemical deplating agent for deplating the iron matrix and then washed by water.

Preferably, the heating temperature is 50-100 ℃, and the deplating time is 2-6 h.

The application provides a chemical nickel-removing agent for an iron matrix, which consists of sodium persulfate, sodium citrate, glycine, alkyl glycoside, monoethanolamine, phosphoric acid, hexamethylenetetramine and benzotriazole in a specific proportion; the sodium persulfate is an oxidant of the chemical nickel-removing agent, has a good nickel-removing effect and is environment-friendly; glycine is used as an auxiliary complexing agent, and is combined with phosphoric acid and monoethanolamine to form a buffer solution, so that the pH value of the solution is stabilized to be about 9, and the maximum solubility of nickel ions is ensured; the monoethanolamine is used as a corrosion inhibitor and a complexing agent, can provide an alkaline environment and is adsorbed on an iron substrate to prevent the substrate from being corroded, and the monoethanolamine can also be used as a complexing agent of nickel ions to accelerate the dissolution of nickel; the antirust agent adopts a mixture of hexamethylene tetramine and benzotriazole to form a layer of protective film on the surface of an iron matrix, so that the corrosion to iron is reduced. Therefore, the chemical stripping agent for the iron matrix has a good stripping effect, is environment-friendly and cannot corrode the iron matrix.

Drawings

FIG. 1 is a schematic flow diagram of the deplating process using the chemical deplating agent for the iron matrix.

Detailed Description

For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.

Aiming at the problems of high toxicity, difficult degradation and high cost of the chemical nickel-removing agent for the iron matrix in the prior art, the application provides the chemical nickel-removing agent for the iron matrix, which can completely remove the electroplated nickel layer on the surface of the iron matrix on the basis of not using strong corrosive and strong polluting chemical raw materials, and has the advantages of low raw material cost, easy operation, low energy consumption, easy treatment of generated wastewater and lower treatment cost. Specifically, the application discloses chemical nickel removing agent for iron matrix includes:

in the chemical nickel-removing agent for the iron matrix, the sodium persulfate is a main component of the nickel-removing agent and is used as an oxidizing agent, so that a nickel-plated layer on the surface of the iron matrix can be effectively removed; the method replaces nitric acid and sodium m-nitrobenzenesulfonate which are polluted greatly, has little harm to operators in the using process, and produces waste water which is easy to treat. The content of the sodium persulfate is 5-10 wt%, and in a specific embodiment, the content of the sodium persulfate is 6-8 wt%. The removal rate of the nickel plating layer on the surface of the iron matrix is accelerated along with the increase of the specific gravity of the sodium persulfate, but the nickel fading rate tends to be flat after the specific gravity reaches 10 wt%.

The sodium citrate is used as a chelating agent, the glycine is used as an auxiliary chelating agent, and the glycine can also form a buffer solution with phosphoric acid and monoethanolamine, so that the pH value of the nickel stripping agent is stabilized at about 9, and the maximum solubility of nickel ions is ensured. The content of the sodium citrate is 4-8 wt%, and in a specific embodiment, the content of the sodium citrate is 5-7 wt%; the glycine content is 5-8 wt%, and in a specific embodiment, the glycine content is 6-7 wt%. The content of the phosphoric acid is 5-8 wt%, and in a specific embodiment, the content of the phosphoric acid is 6-7 wt%.

The monoethanolamine is used as a buffering agent and a complexing agent, provides an alkaline environment, is adsorbed on an iron matrix, can effectively prevent the corrosion of the iron matrix, and can be used as a complexing agent of nickel ions to accelerate the dissolution. The content of the monoethanolamine is 10-16 wt%, and in a specific embodiment, the content of the monoethanolamine is 12-14 wt%.

The alkyl glycoside is used as a surfactant, so that the surface tension can be reduced, the nickel stripping agent is fully contacted with the plating layer, and meanwhile, the nickel stripping agent can smoothly enter the interface between the matrix and the plating layer, so that the nickel dissolving area is increased; the alkyl glycoside has strong wettability, strong acid resistance, strong alkali resistance, hard water resistance, strong salt resistance and easy degradation. The content of the alkyl glycoside is 0.4-1 wt%, and in specific embodiments, the content of the alkyl glycoside is 0.6-0.9 wt%.

The hexamethylene tetramine and the benzotriazole are used as antirust agents, a layer of protective film is formed on the surface of an iron matrix, and corrosion to iron can be reduced. The total content of the hexamethylene tetramine and the benzotriazole is 0.1-0.3 wt%, and the mass ratio of the hexamethylene tetramine to the benzotriazole is (0.9-1.2): 1; in a specific embodiment, the mass ratio of the hexamethylenetetramine to the benzotriazole is 1: 1.

Preferably, the chemical deplating agent for the iron matrix comprises: 8 wt% of sodium persulfate, 5 wt% of sodium citrate, 7 wt% of glycine, 14 wt% of monoethanolamine, 0.6 wt% of alkyl glycoside, 6 wt% of phosphoric acid, 0.2 wt% of a mixture of hexamethylene tetramine and benzotriazole, and the balance of water.

The application also provides a deplating method, a specific flow schematic diagram is shown in figure 1, and the method comprises the following steps:

heating the chemical deplating agent for the iron matrix in the scheme;

the iron matrix with the nickel plating layer is placed in a heated chemical deplating agent for deplating the iron matrix and then washed by water.

In the deplating method, the heating temperature is 50-100 ℃, in a specific embodiment, the heating temperature is 70-80 ℃, and the deplating time is 2-6 hours; when the nickel fading temperature is increased, the nickel fading rate is accelerated, but when the temperature is further increased, the nickel fading rate is gradually increased, the energy consumption is increased, and the cost is increased.

The nickel removing agent and the plating removing method provided by the invention are simple, the nickel removing agent has stable properties, small harmfulness to human bodies and environment, difficult volatilization, difficult decomposition, strong durability and no strong corrosivity; the waste liquid treatment cost is low, and toxic substances such as cyanide, nitrobenzene and the like are not contained; the nickel removing agent has the pH value of 9, does not belong to a strong acid strong base type nickel removing agent, and has low requirements on materials used in the operation process.

In order to further understand the present invention, the following examples are given to illustrate the chemical deplating agent and the deplating method for iron matrix provided by the present invention in detail, and the scope of the present invention is not limited by the following examples.

The following examples and comparative examples adopt a static hanging piece etching method to determine the nickel fading effect of the nickel fading agent; namely, the small nickel sheets and the small iron sheets with the same mass and size are adopted, and the nickel fading effect of the nickel fading agent and the corrosion effect on the iron matrix are judged by observing whether the time required for completely dissolving the nickel sheets and the mass of the weighing iron sheets are reduced or not.