Electrodeposition cobalt plate surface cleaning method

Abstract

The invention discloses an electrodeposition cobalt plate surface cleaning method, and relates to the field of metal surface treatment.The electrodeposition cobalt plate surface cleaning method comprises the following steps that an electrodeposition cobalt plate is placed in acid liquor to be soaked, then cold water soaking, hot water soaking and drying are conducted in sequence, and the acid liquor comprises one or more of hydrochloric acid, ascorbic acid and formic acid. The surface of the electrodeposited cobalt plate is cleaned through acid pickling, cold water washing and hot water washing, ascorbic acid and hydrochloric acid in a specific proportion are added in the acid pickling process, and the cleaned surface of the electrodeposited cobalt plate is silver gray and free of residual oil spots under the combined action.

Description

Technical Field

[0001] The present application relates to the field of metal surface treatment, and in particular to a method for cleaning the surface of an electrolytic cobalt plate. Background Art

[0002] Electrolytic cobalt plates are usually made by electrochemically depositing a cobalt salt solution, causing cobalt to precipitate at the cathode to form a cobalt plate. Contaminants such as organic dirt, anode mud, cobalt salt crystals, and mechanical impurities usually remain on the surface of the electrolytic cobalt plate.

[0003] At present, the electrolytic cobalt plates are cleaned by pickling after production and then rinsed with water and dried. However, the high-priced metal impurities and dirt remaining on the surface of the electrolytic cobalt plates still adhere to the surface of the electrolytic cobalt plates, resulting in residual oil spots on the surface of the electrolytic cobalt plates and yellowing. Summary of the invention

[0004] In view of the shortcomings of the above-mentioned related technologies, the present application provides a method for cleaning the surface of an electrolytic cobalt plate. The present application cleans the surface of the electrolytic cobalt plate by pickling, cold water washing and hot water washing, and adds a specific proportion of ascorbic acid and hydrochloric acid during the pickling process. Under the combined effect, the surface of the electrolytic cobalt plate after cleaning does not turn yellow, but is silver-gray and free of oil spots.

[0005] The present application provides a method for cleaning the surface of an electrolytic cobalt plate using the following technical solution: A method for cleaning the surface of an electrolytic cobalt plate comprises the following steps: soaking the electrolytic cobalt plate in an acid solution, then soaking it in cold water, soaking it in hot water and drying it in sequence, wherein the acid solution comprises one or more of hydrochloric acid, ascorbic acid and formic acid.

[0006] Preferably, the acid solution comprises hydrochloric acid and ascorbic acid.

[0007] Preferably, the molar concentration of the hydrochloric acid is 11%-19%, and the mass concentration of the ascorbic acid is 0.35%-0.45%.

[0008] Preferably, the molar concentration of the hydrochloric acid is 15%, and the mass concentration of the ascorbic acid is 0.4%.

[0009] Preferably, the amount-to-mass ratio of the hydrochloric acid to the ascorbic acid in the acid solution is 35-40 mol:1 g.

[0010] Preferably, the amount-to-mass ratio of the hydrochloric acid to the ascorbic acid in the acid solution is 37.5 mol:1 g.

[0011] Preferably, the soaking time in the acid solution is 25-60 min.

[0012] Preferably, the soaking time in the acid solution is 30 minutes.

[0013] Preferably, the cold water soaking time is 5-15 minutes.

[0014] Preferably, the cold water soaking time is 10 minutes.

[0015] Preferably, the hot water soaking time is 25-50 minutes.

[0016] Preferably, the hot water soaking time is 30 minutes.

[0017] The ratio of the duration of immersion in the acid solution, immersion in cold water and immersion in hot water is 2.5-3.5:1:2.5-3.5.

[0018] The ratio of the duration of immersion in the acid solution, immersion in cold water and immersion in hot water is 3:1:3.

[0019] Preferably, the temperature of the cold water is 5-30°C.

[0020] Preferably, the temperature of the hot water is not less than 90°C.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. This application requires the surface of the electrolytic cobalt plate to be cleaned by pickling, cold water washing and hot water washing, and multiple acids are selected during the pickling process. Under the comprehensive effect, the surface of the electrolytic cobalt plate after cleaning is silver-gray and free of oil spots.

[0022] 2. The present application improves the cleaning effect of the surface of the electrolytic cobalt plate by using hydrochloric acid and ascorbic acid in a specific ratio as the acid solution; 3. The present application improves the cleaning effect on the surface of the electrolytic cobalt plate by controlling the duration of cold water immersion and hot water immersion. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a surface condition diagram of the electrolytic cobalt plate obtained by the cleaning method of Example 1 of the present application.

[0024] Figure 2 This is a surface condition diagram of the electrolytic cobalt plate obtained by the cleaning method of Example 2 of the present application.

[0025] Figure 3 This is a surface condition diagram of the electrolytic cobalt plate obtained by the cleaning method of Comparative Example 1 of the present application.

[0026] Figure 4 This is a surface condition diagram of the electrolytic cobalt plate obtained by the cleaning method of Comparative Example 2 of the present application.

[0027] Figure 5This is a surface condition diagram of the electrolytic cobalt plate obtained by the cleaning method of Comparative Example 3 of the present application.

[0028] Figure 6 This is a surface condition diagram of the electrolytic cobalt plate obtained by the cleaning method of Comparative Example 4 of the present application.

[0029] Figure 7 This is a surface condition diagram of the electrolytic cobalt plate obtained by the cleaning method of Comparative Example 5 of the present application.

[0030] Figure 8 This is a surface condition diagram of the electrolytic cobalt plate obtained by the cleaning method of Comparative Example 6 of the present application.

[0031] Fig. 9 This is a surface condition diagram of the electrolytic cobalt plate obtained by the cleaning method of Comparative Example 7 of the present application. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with examples. The following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. In the following examples, if specific conditions are not specified, they are carried out according to normal conditions or conditions recommended by the manufacturer. The methods used are conventional methods known in the art unless otherwise specified, and the consumables and reagents used are commercially available unless otherwise specified. Unless otherwise specified, the professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any method or material similar or equivalent to the recorded content may also be applied to the present invention.

[0033] The raw materials used in the examples and comparative examples can all be obtained commercially.

[0034] Example 1 Embodiment 1 of the present application provides a method for cleaning the surface of an electrolytic cobalt plate, and the specific steps are as follows: placing the electrolytic cobalt plate in an acid washing tank, soaking it in the acid solution for 30 minutes, then transferring it to a water washing tank, soaking it in 20°C cold water for 10 minutes, and finally scalding it with 92-95°C hot water and soaking it for 30 minutes; The acid solution used in this embodiment has a hydrochloric acid molar concentration of 15% and an ascorbic acid mass concentration of 0.4%.

[0035] Example 2 Example 2 of the present application provides a method for cleaning the surface of an electrolytic cobalt plate. The difference between Example 2 and Example 1 is that the cold water immersion time in Example 2 is 5 minutes.

[0036] Comparative Example 1 Comparative Example 1 provides a method for cleaning the surface of an electrolytic cobalt plate. The difference between Comparative Example 1 and Example 1 is that the mass concentration of ascorbic acid in the acid solution used in Comparative Example 1 is 0.3%.

[0037] Comparative Example 2 Comparative Example 2 provides a method for cleaning the surface of an electrolytic cobalt plate. The difference between Comparative Example 2 and Comparative Example 1 is that the molar concentration of hydrochloric acid in the acid solution used in Comparative Example 2 is 10%.

[0038] Comparative Example 3 Comparative Example 3 provides a method for cleaning the surface of an electrolytic cobalt plate. The difference between Comparative Example 3 and Comparative Example 1 is that the molar concentration of hydrochloric acid in the acid solution used in Comparative Example 3 is 20%.

[0039] Comparative Example 4 Comparative Example 4 provides a method for cleaning the surface of an electrolytic cobalt plate. The difference between Comparative Example 4 and Comparative Example 2 is that the mass concentration of ascorbic acid in the acid solution used in Comparative Example 4 is 0.5%, and the cold water immersion time is 20 minutes.

[0040] Comparative Example 5 Comparative Example 5 provides a method for cleaning the surface of an electrolytic cobalt plate. The difference between Comparative Example 5 and Comparative Example 2 is that the molar concentration of hydrochloric acid in the acid solution used in Comparative Example 5 is 5%, the immersion time during the pickling process is 20 minutes, the immersion time in cold water is 20 minutes, and the immersion time in hot water is 20 minutes.

[0041] Comparative Example 6 Comparative Example 6 provides a method for cleaning the surface of an electrolytic cobalt plate. The difference between Comparative Example 6 and Comparative Example 5 is that the mass concentration of ascorbic acid in the acid solution used in Comparative Example 6 is 0.2%, and the immersion time in cold water is 10 minutes.

[0042] Comparative Example 7 Comparative Example 7 provides a method for cleaning the surface of an electrolytic cobalt plate. The difference between Comparative Example 7 and Example 1 is that the mass concentration of sulfuric acid in the acid solution used in Comparative Example 7 is 20%, and the mass concentration of ascorbic acid is 0.4%.

[0043] Test and Inspection The surface of the electrolytic cobalt plate after cleaning obtained by the electrolytic cobalt plate surface cleaning method of Examples 1-2 and Comparative Examples 1-7 was photographed. Figure 1-9 Results Analysis The following combination Figure 1-8 The experimental results provided are used to explain this application in detail.

[0044] Reference Figure 1 The surface of the electrolytic cobalt plate cleaned by the surface cleaning method of the electrolytic cobalt plate in Example 1 is in good condition overall, with no residual oil spots, and no yellowing or dullness. Figure 2The surface of the electrolytic cobalt plate cleaned by the surface cleaning method of the electrolytic cobalt plate in Example 2 is in good condition overall, with no residual oil spots, no yellowing, and darkening in a small area in the middle.

[0045] Taking Example 1 as a reference, Comparative Example 1 shows the effect of the ascorbic acid concentration in the acid solution and the weight ratio of hydrochloric acid to ascorbic acid in the acid solution on the degree of yellowing, dullness and residual oil spots on the surface of the electrolytic cobalt plate after cleaning. Figure 3 , there are oil spots in a small area in the middle of the surface of the electrolytic cobalt plate cleaned by the surface cleaning method of the electrolytic cobalt plate in Comparative Example 1, and there is yellowing at the edge, indicating that when the amount and mass ratio of hydrochloric acid to ascorbic acid in the acid solution is 37.5:1 and the concentration of ascorbic acid in the acid solution is 0.4%, it is beneficial to improve the cleaning effect on the surface of the electrolytic cobalt plate and reduce the degree of residual oil spots and yellowing on the surface of the electrolytic cobalt plate.

[0046] Taking Example 1 and Comparative Example 1 as reference, Comparative Examples 2 and 3 show the effects of the hydrochloric acid concentration in the acid solution and the weight ratio of hydrochloric acid to ascorbic acid in the acid solution on the degree of yellowing, dullness and residual oil spots on the surface of the electrolytic cobalt plate after cleaning. Figure 4 The surface of the electrolytic cobalt plate cleaned by the surface cleaning method of the electrolytic cobalt plate of comparative example 2 is obviously yellow. Figure 5 The surface of the electro-deposited cobalt plate cleaned by the surface cleaning method of the electro-deposited cobalt plate of Comparative Example 3 has local yellowing and dulling phenomena, which further illustrates that when the amount and mass ratio of hydrochloric acid to ascorbic acid in the acid solution is 37.5:1 and the concentration of hydrochloric acid in the acid solution is 15%, it is beneficial to improve the cleaning effect of the surface of the electro-deposited cobalt plate, reduce the yellowing degree and yellowing range of the surface of the electro-deposited cobalt plate, and reduce the degree of dullness.

[0047] Taking Comparative Example 2 as a reference, Comparative Examples 4 and 5 show the effects of the soaking time of pickling, cold water soaking and hot water soaking on the yellowing, dullness and residual oil spots on the surface of the electrolytic cobalt plate after cleaning. Figure 6 The surface of the electrolytic cobalt plate cleaned by the surface cleaning method of comparative example 4 is obviously yellowed and has a small amount of oil spots. Figure 7 The surface of the electro-deposited cobalt plate cleaned by the surface cleaning method of the electro-deposited cobalt plate in Comparative Example 5 is yellowed and dull as a whole, indicating that in the process of cleaning the electro-deposited cobalt plate, the ratio of the pickling immersion time, the cold water immersion time and the hot water immersion time is 3:1:3, and the pickling immersion time is 30 minutes, the cold water immersion time is 10 minutes and the hot water immersion time is 30 minutes, which is beneficial to improve the cleaning effect of the surface of the electro-deposited cobalt plate, reduce the yellowing degree and yellowing range of the surface of the electro-deposited cobalt plate and reduce the degree of dullness.

[0048] Reference Figure 8In the surface cleaning method of the electrolytic cobalt plate of Comparative Example 6, the hydrochloric acid concentration is 5%, the ascorbic acid concentration is 0.2%, the pickling immersion time is 20 minutes, the cold water immersion time is 10 minutes, and the hot water immersion time is 20 minutes. There are a large number of oil spots on the surface of the electrolytic cobalt plate after cleaning, indicating that the hydrochloric acid and ascorbic acid in the acid solution are not randomly mixed in proportion and concentration. The pickling immersion time, the cold water immersion time, and the hot water immersion time can be randomly selected to achieve the effect of cleaning the oil spots and reducing the yellowing and dullness of the electrolytic cobalt plate in Example 1.

[0049] Taking Example 1 as a reference, Comparative Example 7 shows the effect of the type of acid in the pickling process on the degree of yellowing, dullness, and residual oil spots on the surface of the electrolytic cobalt plate after cleaning. Fig. 9 The surface of the electro-deposited cobalt plate cleaned by the surface cleaning method of the electro-deposited cobalt plate in Comparative Example 7 showed darkening over a large area and yellowing at the edges, indicating that the specific combination of hydrochloric acid and ascorbic acid is beneficial to reducing the degree and range of yellowing and darkening of the electro-deposited cobalt plate.

[0050] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A method for cleaning the surface of an electrolytic cobalt plate, characterized in that: The following steps are involved: The electrolytic cobalt plate is immersed in an acid solution, and then immersed in cold water, immersed in hot water and dried in sequence. The acid solution includes one or more of hydrochloric acid, ascorbic acid and formic acid.

2. A method for cleaning the surface of an electrolytic cobalt plate according to claim 1, characterized in that: The acid solution includes hydrochloric acid and ascorbic acid.

3. A method for cleaning the surface of an electrolytic cobalt plate according to claim 2, characterized in that: The molar concentration of the hydrochloric acid is 11%-19%, and the mass concentration of the ascorbic acid is 0.35%-0.45%.

4. A method for cleaning the surface of an electrolytic cobalt plate according to claim 2, characterized in that: The amount-to-mass ratio of the hydrochloric acid to the ascorbic acid in the acid solution is 35-40 mol:1 g.

5. A method for cleaning the surface of an electrolytic cobalt plate according to claim 1, characterized in that: The soaking time in the acid solution is 25-60 minutes.

6. A method for cleaning the surface of an electrolytic cobalt plate according to claim 1, characterized in that: The duration of the cold water soaking is 5-15 minutes.

7. A method for cleaning the surface of an electrolytic cobalt plate according to claim 1, characterized in that: The duration of the hot water soaking is 25-50 minutes.

8. A method for cleaning the surface of an electrolytic cobalt plate according to claim 1, characterized in that: The ratio of the duration of immersion in the acid solution, immersion in cold water and immersion in hot water is 1:0.2-0.4:

1.

9. A method for cleaning the surface of an electrolytic cobalt plate according to claim 1, characterized in that: The temperature of the cold water is 5-30°C.

10. A method for cleaning the surface of an electrolytic cobalt plate according to claim 1, characterized in that: The temperature of the hot water is not less than 90°C.

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