Silver protectant, its preparation method and application
By forming a dense hydrophobic protective layer through a specific composition, the problems of insufficient sulfidation discoloration and stability of silver protectants are solved, achieving long-term anti-discoloration capability and stability, which is suitable for high-requirement electronic components.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NANTONG MACDERLUN MATERIAL LTD
- Filing Date
- 2023-05-15
- Publication Date
- 2026-06-12
AI Technical Summary
Existing silver protectants are insufficient in terms of resistance to sulfide discoloration and stability, making it difficult to meet the high requirements of electronic component applications. Moreover, most water-soluble protectants on the market can only maintain their color for a short time in potassium sulfide, and their performance deteriorates significantly after storage.
A dense hydrophobic protective layer is formed by combining alkyl thiols, organic corrosion inhibitors, phosphine-containing compounds, film-forming agents, surfactants, and ether solvents in a specific ratio. A complex film is formed on the silver surface by alkyl thiols and organic corrosion inhibitors, which, combined with the chemical adsorption of oleoylsarcosine, enhances the anti-discoloration ability and maintains stability.
The prepared silver protective agent maintains excellent anti-discoloration ability after 2 months, does not affect the contact resistance and solderability of the silver plating layer, is suitable for high-requirement electronic components, and the process is simple, safe and environmentally friendly.
Abstract
Description
Technical Field
[0001] This invention relates to the field of surface treatment, classified under C23C22 / 02, and specifically to a silver protective agent, its preparation method, and its application. Background Technology
[0002] Silver plating possesses excellent electrical and thermal conductivity, solderability, stability, and adhesion, making it widely used in communication, electronic, and electrical products. However, when silver plating is exposed to air and comes into contact with sulfur-containing substances, sulfur oxides, halides, etc., it easily forms insoluble substances such as silver halides, silver sulfate, and silver sulfides. This causes the silver plating to discolor into black or dark brown hues, affecting not only its appearance but also reducing its electrical, thermal, and solderability properties.
[0003] Most silver protectants currently on the market are water-soluble. The silver-plated devices prepared with them can generally only remain unchanged for about 1-4 minutes in 5% potassium sulfide. Furthermore, after half a month of storage, the resistance to discoloration is significantly reduced, limiting their application in the field of electronic components where the resistance to discoloration is extremely important. Therefore, this invention proposes a silver protectant that can effectively prevent oxidation / sulfidation discoloration of the silver plating layer, while maintaining high stability and not affecting the contact resistance and solderability of the silver layer.
[0004] Chinese patent CN102766871A discloses a silver plating anti-discoloration protective agent composition, which is a composition made of octadecyl mercaptan, benzoazole rust inhibitor, solvent and solubilizer. When applied to workpieces, it has an anti-sulfurization ability of up to 10 minutes, but the stability of the composition has not been tested.
[0005] Chinese patent CN108193209A discloses a highly stable water-based silver plating protectant and its preparation method. The silver protectant, made of octadecyl mercaptan, emulsifier, stabilizer, graphene and other substances, can maintain the potassium sulfide resistance of electronic products for more than 12 minutes. However, after one day, the potassium sulfide resistance drops to 10 minutes, and its stability needs to be improved. Summary of the Invention
[0006] To address the aforementioned problems, a first aspect of the present invention provides a silver protectant, comprising, by weight, the following raw materials: 15-30 parts of alkyl thiol, 1-10 parts of organic corrosion inhibitor, 1-8 parts of phosphine-containing compound, 10-30 parts of film-forming agent, 30-50 parts of surfactant, and 1-10 parts of ether solvent.
[0007] More preferably, the silver protectant, by weight, comprises the following raw materials: 18-25 parts alkyl thiols, 3-5 parts organic corrosion inhibitors, 3-6 parts phosphine-containing compounds, 15-25 parts film-forming agents, 35-45 parts surfactants, and 2-5 parts ether solvents.
[0008] More preferably, the silver protectant, by weight, comprises the following raw materials: 21 parts alkyl thiols, 4.5 parts organic corrosion inhibitors, 4.5 parts phosphine-containing compounds, 20 parts film-forming agents, 41 parts surfactants, and 4 parts ether solvents.
[0009] More preferably, the phosphine-containing compound is octylphosphonic acid, the film-forming agent is paraffin, and the ether solvent is ethylene glycol phenyl ether.
[0010] Preferably, the organic corrosion inhibitor includes at least one of benzotriazole, methylbenzotriazole, 2-mercaptobenzothiazole, 2-hydroxybenzothiazole, 2-methylbenzothiazole, and 2-mercaptobenzoimidazolium.
[0011] Preferably, the weight ratio between the alkyl thiol and the organic corrosion inhibitor is (18-22):(2-5).
[0012] More preferably, the weight ratio between the alkyl thiol and the organic corrosion inhibitor is (20-22):(3-5).
[0013] More preferably, the weight ratio between the alkyl thiol and the organic corrosion inhibitor is 21:4.5.
[0014] More preferably, the alkyl thiol is octadecyl thiol.
[0015] Preferably, the organic corrosion inhibitor is benzotriazole and 2-hydroxybenzothiazole in a weight ratio of (1-3):(2-5).
[0016] More preferably, the organic corrosion inhibitor is benzotriazole and 2-hydroxybenzothiazole, with a weight ratio of (2-3):(2-4).
[0017] More preferably, the organic corrosion inhibitor is benzotriazole and 2-hydroxybenzothiazole in a weight ratio of 2:2.5.
[0018] Preferably, the surfactant is a quaternary ammonium-based cationic surfactant or a polyoxyethylene-type nonionic surfactant.
[0019] More preferably, the quaternary ammonium-based cationic surfactant is dodecyl dimethyl benzyl ammonium chloride, and the polyoxyethylene nonionic surfactant includes at least one of lauryl alcohol polyoxyethylene ether, isotretinoin polyoxyethylene ether, octylphenol polyoxyethylene ether, and nonylphenol polyoxyethylene ether.
[0020] More preferably, the quaternary ammonium-based cationic surfactant is dodecyl dimethyl benzyl ammonium chloride, and the polyoxyethylene-type nonionic surfactant is nonylphenol polyoxyethylene ether.
[0021] Preferably, the weight ratio between the quaternary ammonium-based cationic surfactant and the polyoxyethylene nonionic surfactant is (0.5-2):(35-45).
[0022] More preferably, the weight ratio between the quaternary ammonium-based cationic surfactant and the polyoxyethylene-type nonionic surfactant is (0.5-1.5):(38-41).
[0023] More preferably, the weight ratio between the quaternary ammonium-based cationic surfactant and the polyoxyethylene-type nonionic surfactant is 1:40.
[0024] Preferably, the raw materials of the silver protectant also include 3-10 parts of amino acid derivative compounds.
[0025] More preferably, the raw materials of the silver protective agent also include 4-6 parts of amino acid derivative compounds.
[0026] More preferably, the raw materials of the silver protective agent also include 5 parts of an amino acid derivative compound.
[0027] Preferably, the amino acid-derived compound is oleoylsarcosine.
[0028] The second aspect of the present invention provides a method for preparing a silver protectant, comprising the following steps: first, placing a surfactant in a liquid mixer, and adding alkyl thiols, organic corrosion inhibitors, phosphine-containing compounds, film-forming agents, and ether solvents at 800-900 rpm / min, and continuing to stir for 20-25 min to obtain the silver protectant.
[0029] The present invention also provides a method for using a silver protectant, comprising the following steps: adding a certain volume of water to a working tank, heating to 55-85°C, then adding 10-100 mL / L of silver protectant and stirring, then continuing to add water and stirring, then cooling to 50-60°C to obtain a protective solution, immersing the silver-plated device in the protective solution for 0.5-5 minutes, cleaning, and drying.
[0030] A third aspect of this invention provides the application of a silver protective agent in electronic components.
[0031] This application specifies that when the weight ratio of octadecyl mercaptan and the organic corrosion inhibitor is (18-22):(2-5), and the weight ratio of benzotriazole and 2-hydroxybenzothiazole is (1-3):(2-5), the two interact to form a thin silver complex film on the silver surface, which hinders the reaction of silver ions with sulfur components in the environment and improves its anti-discoloration ability. On this basis, 7 parts by weight of oleylsarcosine are added. The three work together, and the polar groups of oleylsarcosine form a chemical adsorption with the metal surface, making... The film is denser, and the nonpolar groups are oriented away from the metal surface to form a dense hydrophobic protective layer, which further improves the anti-discoloration ability. However, excessive addition of oleoyl sarcosine may affect its stability. In order to maximize its anti-discoloration ability while ensuring its stability, dodecyl dimethyl benzyl ammonium chloride and nonylphenol polyoxyethylene ether are added, and the weight ratio of the two is limited to (0.5-1.5):(38-41), so that its anti-discoloration ability is still excellent after 2 months.
[0032] Beneficial effects: The silver protective agent prepared by this invention effectively prevents the silver plating layer from undergoing sulfidation and discoloration. Even after two months of storage, the protective agent still exhibits excellent anti-discoloration ability and does not change the contact resistance and solderability of the silver plating layer. It can be applied to the field of electronic components where anti-discoloration ability is extremely important, solving the problem of low stability of silver protective agents in the prior art. In addition, the method of this invention is simple and easy to operate, and the formed protective layer is non-toxic and non-irritating, greatly improving its safety and environmental friendliness. Example
[0033] Example 1
[0034] A silver protectant, by weight, comprises the following raw materials: 21 parts alkyl thiols, 4.5 parts organic corrosion inhibitors, 4.5 parts phosphine-containing compounds, 20 parts film-forming agents, 41 parts surfactants, 4 parts ether solvents, and 5 parts amino acid derivative compounds.
[0035] The alkyl mercaptan is octadecyl mercaptan, and the weight ratio of octadecyl mercaptan to the organic corrosion inhibitor is 21:4.5.
[0036] The organic corrosion inhibitor is benzotriazole and 2-hydroxybenzothiazole in a weight ratio of 2:2.5.
[0037] The phosphine-containing compound is octylphosphonic acid.
[0038] The film-forming agent is paraffin.
[0039] The surfactant is dodecyl dimethyl benzyl ammonium chloride and nonylphenol polyoxyethylene ether, with a weight ratio of 1:40. The dodecyl dimethyl benzyl ammonium chloride was purchased from Lanabai, and the nonylphenol polyoxyethylene ether was purchased from Haishihua, model OP-10.
[0040] The ether solvent is ethylene glycol phenyl ether.
[0041] The amino acid derivative compound is oleylsarcosine, purchased from Ausenyu, with a purity of 90%, an acid value of 153-163 mgKOH / g, and a density of 0.94-0.97 g / cm³ at 20°C. 3 .
[0042] This embodiment also provides a method for preparing and using a silver protectant. The preparation method includes the following steps: First, place the surfactant in a liquid mixer, and add alkyl thiols, organic corrosion inhibitors, phosphine-containing compounds, film-forming agents, and ether solvents at 900 rpm / min. Continue stirring for 20 min to obtain the silver protectant.
[0043] The method of use includes the following steps: add 75% volume of water to the working tank, heat to 60°C, add 50 mL / L of silver protectant and stir, then add 10% volume of water and stir again, then cool to 55°C to obtain a protective solution. Immerse the silver-plated device in the protective solution for 3 minutes, clean it, and then dry it.
[0044] This embodiment also provides an application of silver protective agent in electronic components.
[0045] Example 2
[0046] A silver protectant, by weight, comprises the following raw materials: 21 parts alkyl thiols, 4.5 parts organic corrosion inhibitors, 4.5 parts phosphine-containing compounds, 20 parts film-forming agents, 32 parts surfactants, 4 parts ether solvents, and 10 parts amino acid derivative compounds.
[0047] The alkyl mercaptan is octadecyl mercaptan, and the weight ratio of octadecyl mercaptan to organic corrosion inhibitor is 21:4.5.
[0048] The organic corrosion inhibitor is benzotriazole and 2-hydroxybenzothiazole in a weight ratio of 2:2.5.
[0049] The phosphine-containing compound is octylphosphonic acid.
[0050] The film-forming agent is paraffin.
[0051] The surfactant is dodecyl dimethyl benzyl ammonium chloride and nonylphenol polyoxyethylene ether, with a weight ratio of 1:40. The dodecyl dimethyl benzyl ammonium chloride was purchased from Lanabai, and the nonylphenol polyoxyethylene ether was purchased from Haishihua, model OP-10.
[0052] The ether solvent is ethylene glycol phenyl ether.
[0053] The amino acid derivative compound is oleylsarcosine, purchased from Ausenyu, with a purity of 90%, an acid value of 153-163 mgKOH / g, and a density of 0.94-0.97 g / cm³ at 20°C. 3 .
[0054] This embodiment also provides a method for preparing and using a silver protectant. The preparation method includes the following steps: First, place the surfactant in a liquid mixer, and add alkyl thiols, organic corrosion inhibitors, phosphine-containing compounds, film-forming agents, and ether solvents at 900 rpm / min. Continue stirring for 20 min to obtain the silver protectant.
[0055] The method of use includes the following steps: add 75% volume of water to the working tank, heat to 60°C, add 50 mL / L of silver protectant and stir, then add 10% volume of water and stir again, then cool to 55°C to obtain a protective solution. Immerse the silver-plated device in the protective solution for 3 minutes, clean it, and then dry it.
[0056] This embodiment also provides an application of silver protective agent in electronic components.
[0057] Example 3
[0058] A silver protectant, by weight, comprises the following raw materials: 18 parts alkyl thiols, 2 parts organic corrosion inhibitors, 4.5 parts phosphine-containing compounds, 20 parts film-forming agents, 41 parts surfactants, 4 parts ether solvents, and 3 parts amino acid derivative compounds.
[0059] The alkyl mercaptan is octadecyl mercaptan, and the weight ratio of octadecyl mercaptan to the organic corrosion inhibitor is 18:2.
[0060] The organic corrosion inhibitor is benzotriazole and 2-hydroxybenzothiazole in a weight ratio of 2:2.5.
[0061] The phosphine-containing compound is octylphosphonic acid.
[0062] The film-forming agent is paraffin.
[0063] The surfactant is dodecyl dimethyl benzyl ammonium chloride and nonylphenol polyoxyethylene ether, with a weight ratio of 1:40. The dodecyl dimethyl benzyl ammonium chloride was purchased from Lanabai, and the nonylphenol polyoxyethylene ether was purchased from Haishihua, model OP-10.
[0064] The ether solvent is ethylene glycol phenyl ether.
[0065] The amino acid derivative compound is oleylsarcosine, purchased from Ausenyu, with a purity of 90%, an acid value of 153-163 mgKOH / g, and a density of 0.94-0.97 g / cm³ at 20°C. 3 .
[0066] This embodiment also provides a method for preparing and using a silver protectant. The preparation method includes the following steps: First, place the surfactant in a liquid mixer, and add alkyl thiols, organic corrosion inhibitors, phosphine-containing compounds, film-forming agents, and ether solvents at 900 rpm / min. Continue stirring for 20 min to obtain the silver protectant.
[0067] The method of use includes the following steps: add 75% volume of water to the working tank, heat to 60°C, add 50 mL / L of silver protectant and stir, then add 10% volume of water and stir again, then cool to 55°C to obtain a protective solution. Immerse the silver-plated device in the protective solution for 3 minutes, clean it, and then dry it.
[0068] This embodiment also provides an application of silver protective agent in electronic components.
[0069] Comparative Example 1
[0070] A silver protectant, by weight, comprises the following raw materials: 25 parts alkyl thiol, 4.5 parts organic corrosion inhibitor, 4.5 parts phosphine-containing compound, 20 parts film-forming agent, 50 parts surfactant, and 4 parts ether solvent.
[0071] The alkyl mercaptan is octadecyl mercaptan, and the weight ratio of octadecyl mercaptan to the organic corrosion inhibitor is 25:4.5.
[0072] The organic corrosion inhibitor is benzotriazole and 2-hydroxybenzothiazole in a weight ratio of 2:2.5.
[0073] The phosphine-containing compound is octylphosphonic acid.
[0074] The film-forming agent is paraffin.
[0075] The surfactant is dodecyl dimethyl benzyl ammonium chloride and nonylphenol polyoxyethylene ether, with a weight ratio of 1:40. The dodecyl dimethyl benzyl ammonium chloride was purchased from Lanabai, and the nonylphenol polyoxyethylene ether was purchased from Haishihua, model OP-10.
[0076] The ether solvent is ethylene glycol phenyl ether.
[0077] This embodiment also provides a method for preparing and using a silver protectant. The preparation method includes the following steps: First, place the surfactant in a liquid mixer, and add alkyl thiols, organic corrosion inhibitors, phosphine-containing compounds, film-forming agents, and ether solvents at 900 rpm / min. Continue stirring for 20 min to obtain the silver protectant.
[0078] The method of use includes the following steps: add 75% volume of water to the working tank, heat to 60°C, add 50 mL / L of silver protectant and stir, then add 10% volume of water and stir again, then cool to 55°C to obtain a protective solution. Immerse the silver-plated device in the protective solution for 3 minutes, clean it, and then dry it.
[0079] This embodiment also provides an application of silver protective agent in electronic components.
[0080] Comparative Example 2
[0081] A silver protectant, by weight, comprises the following raw materials: 21 parts alkyl thiols, 4.5 parts organic corrosion inhibitors, 4.5 parts phosphine-containing compounds, 20 parts film-forming agents, 40 parts surfactants, 4 parts ether solvents, and 5 parts amino acid derivative compounds.
[0082] The alkyl mercaptan is octadecyl mercaptan, and the weight ratio between the octadecyl mercaptan and the organic corrosion inhibitor is 21:4.5.
[0083] The organic corrosion inhibitor is benzotriazole and 2-hydroxybenzothiazole in a weight ratio of 2:2.5.
[0084] The phosphine-containing compound is octylphosphonic acid.
[0085] The film-forming agent is paraffin.
[0086] The surfactant is nonylphenol polyoxyethylene ether, which was purchased from Hai Shi Hua and is model OP-10.
[0087] The ether solvent is ethylene glycol phenyl ether.
[0088] The amino acid derivative compound is oleylsarcosine, purchased from Ausenyu, with a purity of 90%, an acid value of 153-163 mgKOH / g, and a density of 0.94-0.97 g / cm³ at 20°C. 3 .
[0089] This embodiment also provides a method for preparing and using a silver protectant. The preparation method includes the following steps: First, place the surfactant in a liquid mixer, and add alkyl thiols, organic corrosion inhibitors, phosphine-containing compounds, film-forming agents, and ether solvents at 900 rpm / min. Continue stirring for 20 min to obtain the silver protectant.
[0090] The method of use includes the following steps: add 75% volume of water to the working tank, heat to 60°C, add 50 mL / L of silver protectant and stir, then add 10% volume of water and stir again, then cool to 55°C to obtain a protective solution. Immerse the silver-plated device in the protective solution for 3 minutes, clean it, and then dry it.
[0091] This embodiment also provides an application of silver protective agent in electronic components.
[0092] Comparative Example 3
[0093] A silver protectant, by weight, comprises the following raw materials: 21 parts alkyl thiols, 4.5 parts organic corrosion inhibitors, 4.5 parts phosphine-containing compounds, 20 parts film-forming agents, 51 parts surfactants, 4 parts ether solvents, and 15 parts amino acid derivative compounds.
[0094] The alkyl mercaptan is octadecyl mercaptan, and the weight ratio of octadecyl mercaptan to organic corrosion inhibitor is 21:4.5.
[0095] The organic corrosion inhibitor is benzotriazole and 2-hydroxybenzothiazole in a weight ratio of 2:2.5.
[0096] The phosphine-containing compound is octylphosphonic acid.
[0097] The film-forming agent is paraffin.
[0098] The surfactant is dodecyl dimethyl benzyl ammonium chloride and nonylphenol polyoxyethylene ether, with a weight ratio of 1:40. The dodecyl dimethyl benzyl ammonium chloride was purchased from Lanabai, and the nonylphenol polyoxyethylene ether was purchased from Haishihua, model OP-10.
[0099] The ether solvent is ethylene glycol phenyl ether.
[0100] The amino acid derivative compound is oleylsarcosine, purchased from Ausenyu, with a purity of 90%, an acid value of 153-163 mgKOH / g, and a density of 0.94-0.97 g / cm³ at 20°C. 3 .
[0101] This embodiment also provides a method for preparing and using a silver protectant. The preparation method includes the following steps: First, place the surfactant in a liquid mixer, and add alkyl thiols, organic corrosion inhibitors, phosphine-containing compounds, film-forming agents, and ether solvents at 900 rpm / min. Continue stirring for 20 min to obtain the silver protectant.
[0102] The method of use includes the following steps: add 75% volume of water to the working tank, heat to 60°C, add 50 mL / L of silver protectant and stir, then add 10% volume of water and stir again, then cool to 55°C to obtain a protective solution. Immerse the silver-plated device in the protective solution for 3 minutes, clean it, and then dry it.
[0103] This embodiment also provides an application of silver protective agent in electronic components.
[0104] Comparative Example 4
[0105] A silver protectant, by weight, comprises the following raw materials: 40 parts alkyl thiols, 2 parts organic corrosion inhibitors, 4.5 parts phosphine-containing compounds, 20 parts film-forming agents, 41 parts surfactants, 4 parts ether solvents, and 5 parts amino acid derivative compounds.
[0106] The alkyl thiol is octadecyl thiol, and the weight ratio of the alkyl thiol to the organic corrosion inhibitor is 40:2.
[0107] The organic corrosion inhibitor is benzotriazole and 2-hydroxybenzothiazole in a weight ratio of 2:2.5.
[0108] The phosphine-containing compound is octylphosphonic acid.
[0109] The film-forming agent is paraffin.
[0110] The surfactant is dodecyl dimethyl benzyl ammonium chloride and nonylphenol polyoxyethylene ether, with a weight ratio of 1:40. The dodecyl dimethyl benzyl ammonium chloride was purchased from Lanabai, and the nonylphenol polyoxyethylene ether was purchased from Haishihua, model OP-10.
[0111] The ether solvent is ethylene glycol phenyl ether.
[0112] The amino acid derivative compound is oleylsarcosine, purchased from Ausenyu, with a purity of 90%, an acid value of 153-163 mgKOH / g, and a density of 0.94-0.97 g / cm³ at 20°C. 3 .
[0113] This embodiment also provides a method for preparing and using a silver protectant. The preparation method includes the following steps: First, place the surfactant in a liquid mixer, and add alkyl thiols, organic corrosion inhibitors, phosphine-containing compounds, film-forming agents, and ether solvents at 900 rpm / min. Continue stirring for 20 min to obtain the silver protectant.
[0114] The method of use includes the following steps: add 75% volume of water to the working tank, heat to 60°C, add 50 mL / L of silver protectant and stir, then add 10% volume of water and stir again, then cool to 55°C to obtain a protective solution. Immerse the silver-plated device in the protective solution for 3 minutes, clean it, and then dry it.
[0115] This embodiment also provides an application of silver protective agent in electronic components.
[0116] Performance Evaluation
[0117] (1) Potassium sulfide color change experiment: The silver-plated devices obtained in the examples and comparative examples were immersed in a potassium sulfide solution with a temperature of 25°C and a solution concentration of 5% for a period of time, and the time of color change was recorded.
[0118] (2) Stability test: The silver protectants obtained in the examples and comparative examples were placed at 25°C for 2 months and then potassium sulfide color change test was performed. The time of color change was recorded.
[0119] Table 1
[0120] Example Color change time (min) Stability (min) Example 1 30 27 Example 2 30 26 Example 3 28 25 Comparative Example 1 22 18 Comparative Example 2 27 20 Comparative Example 3 27 19 Comparative Example 4 25 22
[0121] Compared with Example 1, Comparative Example 1 did not contain oleylsarcosine, which mainly affected its anti-discoloration ability. Comparative Example 2 did not contain dodecyl dimethyl benzyl ammonium chloride, which reduced the stability of the silver protectant. Comparative Example 3 had a larger amount of oleylsarcosine added, which affected the stability of the silver protectant. Comparative Example 4 changed the weight ratio of octadecyl alcohol and organic corrosion inhibitor, which affected the anti-discoloration ability of the silver protectant.
Claims
1. A silver protective agent, characterized in that, By weight, its raw materials include: 15-30 parts of alkyl thiol, 1-10 parts of organic corrosion inhibitor, 1-8 parts of phosphine-containing compound, 10-30 parts of film-forming agent, 30-50 parts of surfactant, and 1-10 parts of ether solvent. The weight ratio between the alkyl thiol and the organic corrosion inhibitor is (20-22):(3-5); the organic corrosion inhibitor is benzotriazole and 2-hydroxybenzothiazole, and the weight ratio between the two is (2-3):(2-4). The surfactant is a quaternary ammonium-based cationic surfactant and a polyoxyethylene-based nonionic surfactant, and the weight ratio between the quaternary ammonium-based cationic surfactant and the polyoxyethylene-based nonionic surfactant is (0.5-1.5):(38-41). The raw materials of the silver protectant also include 3-10 parts of an amino acid derivative compound; the amino acid derivative compound is oleoylsarcosine.
2. A method for preparing the silver protective agent according to claim 1, characterized in that, The process includes the following steps: mixing alkyl thiols, organic corrosion inhibitors, phosphine-containing compounds, film-forming agents, surfactants, ether solvents, and amino acid derivative compounds to obtain the final product.
3. The application of the silver protective agent according to claim 1 in electronic components.