Treating agent and application thereof as material for improving surface wettability of plating layer

Abstract

The invention provides a treating agent and application of the treating agent as a material for improving the surface wettability of a plating layer, the treating agent comprises methanol and a surfactant, the surfactant comprises 99-105 parts by volume of methanol, 10-15 parts by volume of 1, 2-octylene glycol, 10-15 parts by volume of alkylphenol polyoxyethylene ether and 10-15 parts by volume of fatty alcohol-polyoxyethylene ether, and the treating agent comprises 10-15 parts by volume of 1, 2-octylene glycol, 10-15 parts by volume of alkylphenol polyoxyethylene ether and 10-15 parts by volume of fatty alcohol-polyoxyethylene ether. 0.2 to 1 part of 1, 2-octylene glycol, 0.05 to 1 part of alkylphenol polyoxyethylene ether and 0.05 to 1 part of fatty alcohol-polyoxyethylene ether. The technical problems that after an existing metal surface is electroplated, the wettability of a plating layer surface is reduced, the strength is insufficient when an electroplated workpiece is bonded with other parts, and the falling risk exists are solved. The method can be widely applied to metal coating surface treatment.

Description

Technical Field

[0001] This invention relates to the field of coating surface treatment, and in particular to a treatment agent and its application as a material for improving the wettability of coating surfaces. Background Technology

[0002] Electroplating forms a protective layer on metal surfaces, enhancing their corrosion resistance and wear resistance, thereby extending the service life of the workpiece. In engineering applications, many electroplated workpieces need to be bonded to components of other equipment. When using the same adhesive, the reliability of the bond largely depends on the wettability (or wettability) of the adhesive on the plating surface. Good wettability ensures the adhesive spreads fully on the plating surface, improving bond strength. However, after post-treatment processes such as cleaning, passivation, and sealing, the wettability of the plating surface decreases, consequently reducing the adhesive's bond strength and posing a risk of detachment. This risk is especially high under conditions of high-speed movement, rotation, or vibration (such as the high-speed rotation of a motor rotor), further impacting the reliability and safety of the equipment.

[0003] Existing technologies include processes that involve immersing the workpiece in a treatment agent before electroplating, which can improve the electroplating effect. However, this does not improve the adhesion of the workpiece after electroplating, and the adhesion strength of the workpiece after electroplating remains low, posing a significant safety hazard to users. Summary of the Invention

[0004] This invention addresses the technical problem that reduced surface wettability of electroplated metal surfaces leads to insufficient bonding strength between electroplated workpieces and other components, posing a risk of detachment. It provides a treatment agent that improves the wettability of the metal surface coating by treating the coating surface, thereby enhancing the bonding strength between electroplated workpieces and other components, and its application as a material for improving coating surface wettability.

[0005] Therefore, the technical solution of the present invention is a treatment agent comprising methanol and a surfactant, wherein the surfactant comprises 1,2-octanediol, alkylphenol polyoxyethylene ether, and fatty alcohol polyoxyethylene ether, and the volume fractions of each component in the treatment agent are: 99-105 parts methanol, 0.2-1 part 1,2-octanediol, 0.05-1 part alkylphenol polyoxyethylene ether, and 0.05-1 part fatty alcohol polyoxyethylene ether.

[0006] Preferably, the volume parts of the substances in the treatment agent are: 105 parts methanol, 0.2 parts 1,2-octanediol, 0.05 parts alkylphenol polyoxyethylene ether, and 0.4 parts fatty alcohol polyoxyethylene ether.

[0007] Application of a treatment agent as a material to improve the wettability of a coating surface.

[0008] Preferably, the application of the treatment agent as a material to improve the wettability of the coating surface includes the following steps: S1: Clean the electroplated workpiece with pure water to remove residual electroplating solution from the workpiece surface; S2: Place the cleaned electroplated workpiece into the treatment agent and immerse it at room temperature; S3: Remove the electroplated workpiece from the treatment agent, let it dry, and the surface treatment of the electroplated workpiece is completed.

[0009] Preferably, in step S2, the soaking time is 20-30 seconds.

[0010] The beneficial effects of this invention are: (1) The surface wettability test of the electroplated workpiece treated by the solution described in this application shows that the reagent spreadability of the electroplated surface is significantly improved after treatment; after bonding with other parts, the shear strength is also significantly improved in the strength test. (2) The treatment agent has simple components and the treatment method is simple and easy to operate, which can greatly improve the reliability of the bonding between electroplated workpieces and other parts. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the partitioning of the workpiece under test in the wettability test of Embodiments 1-3 and Comparative Examples 1-3 of the present invention; Figure 2 These are schematic diagrams of the component structures used in the adhesive strength tests of Embodiments 1-3 and Comparative Examples 1-3 of the present invention. Figure 3 This is a schematic diagram of another component structure used in the adhesive strength test of Embodiments 1-3 and Comparative Examples 1-3 of the present invention.

[0012] Explanation of symbols in the diagram: 1. Sample; 2. Fixing base; 3. Adhesive surface. Detailed Implementation

[0013] The present invention will be further described below with reference to embodiments.

[0014] Example 1 A treatment agent for improving the wettability of a coating surface comprises methanol and a surfactant, wherein the surfactant includes 1,2-octanediol, alkylphenol polyoxyethylene ether, and fatty alcohol polyoxyethylene ether, and the volume parts are: 105 parts methanol, 0.2 parts 1,2-octanediol, 0.05 parts alkylphenol polyoxyethylene ether, and 0.4 parts fatty alcohol polyoxyethylene ether.

[0015] The above-mentioned treatment agent is used to treat the surface of the nickel plating layer. The specific method is as follows: S1: Clean the electroplated workpiece with pure water to remove residual electroplating solution from the workpiece surface; S2: Place the cleaned electroplated workpiece into the treatment agent and immerse it at room temperature for 20-30 seconds; S3: Remove the electroplated workpiece from the treatment agent, let it dry, and the surface treatment of the electroplated workpiece is completed.

[0016] Example 2 A treatment agent for improving the wettability of a coating surface comprises methanol and a surfactant, the surfactant including 1,2-octanediol, alkylphenol polyoxyethylene ether, and fatty alcohol polyoxyethylene ether, in the following volume parts: 102 parts methanol, 0.35 parts 1,2-octanediol, 1 part alkylphenol polyoxyethylene ether, and 0.05 parts fatty alcohol polyoxyethylene ether.

[0017] The above-mentioned treatment agent is used to treat the surface of the nickel plating layer. The specific method is as follows: S1: Clean the electroplated workpiece with pure water to remove residual electroplating solution from the workpiece surface; S2: Place the cleaned electroplated workpiece into the treatment agent and immerse it at room temperature for 20-30 seconds; S3: Remove the electroplated workpiece from the treatment agent, let it dry, and the surface treatment of the electroplated workpiece is completed.

[0018] Example 3 A treatment agent for improving the wettability of a coating surface comprises methanol and a surfactant, wherein the surfactant includes 1,2-octanediol, alkylphenol polyoxyethylene ether, and fatty alcohol polyoxyethylene ether, and the volume parts are: 99 parts methanol, 1 part 1,2-octanediol, 0.25 parts alkylphenol polyoxyethylene ether, and 1 part fatty alcohol polyoxyethylene ether.

[0019] The above-mentioned treatment agent is used to treat the surface of the nickel plating layer. The specific method is as follows: S1: Clean the electroplated workpiece with pure water to remove residual electroplating solution from the workpiece surface; S2: Place the cleaned electroplated workpiece into the treatment agent and immerse it at room temperature for 20-30 seconds; S3: Remove the electroplated workpiece from the treatment agent, let it dry, and the surface treatment of the electroplated workpiece is completed.

[0020] Comparative Example 1 A treatment agent for improving the wettability of a coating surface comprises methanol and a surfactant, wherein the surfactant includes alkylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether, and the volume parts are: 103 parts methanol, 1.8 parts alkylphenol polyoxyethylene ether, and 1.2 parts fatty alcohol polyoxyethylene ether.

[0021] The nickel plating surface was treated with the above-mentioned treatment agent, and the specific method was the same as in Example 1.

[0022] Comparative Example 2 A treatment agent for improving the wettability of a coating surface comprises methanol and a surfactant, wherein the surfactant includes 1,2-octanediol and fatty alcohol polyoxyethylene ether, and the volume parts are: 101.4 parts methanol, 2 parts 1,2-octanediol, and 1.4 parts fatty alcohol polyoxyethylene ether.

[0023] The nickel plating surface was treated with the above-mentioned treatment agent, and the specific method was the same as in Example 1.

[0024] Comparative Example 3 A treatment agent for improving the wettability of a coating surface comprises methanol and a surfactant, the surfactant including 1,2-octanediol and alkylphenol polyoxyethylene ether, in the following volume parts: methanol 99.5 parts, 1,2-octanediol 1.8 parts, and alkylphenol polyoxyethylene ether 2.1 parts.

[0025] The nickel plating surface was treated with the above-mentioned treatment agent, and the specific method was the same as in Example 1.

[0026] Using the German Arcotec 41mN / m reagent, wettability tests were performed on the surfaces of electroplated workpieces treated with the treatment agents in Examples 1-3 and Comparative Examples 1-3, as well as on the surfaces of electroplated workpieces not treated with the treatment agents. The specific method is as follows: Taking Example 1 as an example, such as Figure 1 As shown, six workpiece samples of the same size were randomly selected from the same batch of electroplated cubic workpieces for testing. One face of each sample was divided into three parts: left, middle, and right. The six workpieces were numbered as sample 1#, sample 2#, sample 3#, sample 4#, sample 5#, and sample 6#. Samples 1#, 2#, and 3# were samples treated with the surface treatment agent of this application, while samples 4#, 5#, and 6# were samples not treated with the surface treatment agent of this application. The same amount of reagent was dropped onto different parts of different samples, such as the left part of sample 1#, the middle part of sample 2#, the right part of sample 3#, the left part of sample 4#, the middle part of sample 5#, and the right part of sample 6#. The spread of the reagent on the sample plating surface was observed.

[0027] Examples 2 and 3 use the same method as Example 1 to test the wettability of the samples. Comparative Examples 1 and 3 take three workpiece samples (sample 1, sample 2, and sample 3) according to the above test method and test them.

[0028] Table 1 compares the extent of reagent spread on the coating surface after 1 minute when the reagent was dropped onto the corresponding parts of the samples (sample 1, sample 2, sample 3) in Examples 1-3, Comparative Examples 1-3, and untreated samples (sample 4, sample 5, sample 6). In the table, ☆ indicates that the reagent spread diameter is greater than 7 mm and covers the entire surface, √ indicates that the reagent spread diameter is greater than 7 mm but does not cover the entire surface, and × indicates that the reagent spread diameter is less than 7 mm.

[0029] Table 1 As can be seen from the above wettability tests, the samples treated with the treatment agents in Examples 1-3 showed a significantly greater spread of the reagent on the coating surface compared to the untreated samples, indicating a substantial improvement in the wettability of the treated coating surface. In contrast, the lack of any one of the components—1,2-octanediol, alkylphenol polyoxyethylene ether, or fatty alcohol polyoxyethylene ether—in the surfactants of Comparative Examples 1-3, or excessively high or low volume fractions of any of the components in the treatment agents, negatively impacted the reagent spread diameter, preventing the reagent from spreading evenly across the entire surface.

[0030] like Figures 2-3 The adhesive strength test of the samples is shown below. The specific method is as follows: Using the same samples from the wettability test, apply an equal amount of the same adhesive evenly to any surface of each sample. Adhere the samples to the fixed base and wait for the same amount of time under the same conditions until the adhesive is completely cured. Apply a pushing force to the samples until they detach, record the maximum load applied each time, and calculate the shear strength using the following formula: τ = F / (L·B) Where F is the maximum load, L is the bonding length, and B is the bonding width. In this test, L=B=20mm.

[0031] Table 2 shows a comparison of the results of the adhesive strength test of the samples using the above method.

[0032] Table 2 As shown in Table 2, the samples treated with the treatment agents in Examples 1-3 of this application exhibit significantly better shear strength than the untreated samples, indicating better adhesive strength and further demonstrating superior surface wettability. In contrast, the lack of any one of the components—1,2-octanediol, alkylphenol polyoxyethylene ether, or fatty alcohol polyoxyethylene ether—in the surfactants of Comparative Examples 1-3, or excessively high or low volume fractions of any component in the treatment agents, negatively impacted shear strength, resulting in significantly lower shear strengths compared to the samples in Examples 1-3.

[0033] The test data in Tables 1-2 of this application are all samples with nickel plating. The treatment agents in Examples 1-3 were applied to zinc plating and chromium plating for testing, and the effect was the same as that of nickel plating. When applied to plating of other materials, it can still achieve the effect of improving the wettability of the plating surface.

[0034] However, the above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A treatment agent, characterized in that, It contains methanol and surfactants, the surfactants including 1,2-octanediol, alkylphenol polyoxyethylene ether, and fatty alcohol polyoxyethylene ether. The volume parts of each component in the treatment agent are: 99-105 parts methanol, 0.2-1 part 1,2-octanediol, 0.05-1 part alkylphenol polyoxyethylene ether, and 0.05-1 part fatty alcohol polyoxyethylene ether.

2. The treatment agent according to claim 1, characterized in that, The volume fractions of each component in the treatment agent are as follows: 105 parts methanol, 0.2 parts 1,2-octanediol, 0.05 parts alkylphenol polyoxyethylene ether, and 0.4 parts fatty alcohol polyoxyethylene ether.

3. The application of the treatment agent as described in claim 1 as a material for improving the wettability of the coating surface.

4. The application of the treatment agent according to claim 3 as a material for improving the wettability of the coating surface, characterized in that, Includes the following steps: S1: Clean the electroplated workpiece with pure water to remove residual electroplating solution from the workpiece surface; S2: Place the cleaned electroplated workpiece into the treatment agent and immerse it at room temperature; S3: Remove the electroplated workpiece from the treatment agent, let it dry, and the surface treatment of the electroplated workpiece is completed.

5. The application of the treatment agent according to claim 4 as a material for improving the wettability of the coating surface, characterized in that, In step S2, the soaking time is 20-30 seconds.

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