Method for cleaning residual graphite lubricant on surface of hot-drawn magnesium alloy wire

Abstract

The invention relates to the technical field of magnesium alloy wire surface treatment, in particular to a method for cleaning residual graphite lubricant on the surface of a hot-drawn magnesium alloy wire, which comprises the following steps: firstly, immersing the magnesium alloy wire into a pickling solution for pickling; washing the pickled magnesium alloy wire with water; immersing the washed magnesium alloy wire in an alkali washing solution for alkali washing; and the magnesium alloy wire after alkali washing is washed with water and then dried, cleaning of the residual graphite lubricant on the surface of the hot-drawn magnesium alloy wire can be completed, and in this way, the technical problems that in the prior art, an existing mode for removing a graphite lubricating layer on the surface of the magnesium alloy wire is poor in treatment effect, and the smoothness of the wire is affected are solved.

Description

Technical Field

[0001] The invention relates to the technical field of magnesium alloy wire surface treatment, and in particular to a method for cleaning graphite lubricant residue on the surface of a hot-drawn magnesium alloy wire. Background Art

[0002] Magnesium alloy wires are lightweight, high-strength, and have good biocompatibility, making them widely used in medical devices, welding materials, microelectronic packaging, aerospace equipment parts, arc spraying, and other fields. Hot drawing is an ideal process for forming magnesium alloy wires. It has the advantages of uniform product size, high dimensional accuracy, the ability to produce ultra-fine diameter wires, and the ability to achieve high-speed continuous production. However, during drawing, in order to reduce the friction between the blank and the forming rod, high-temperature resistant graphite must be used as a lubricant. Therefore, a layer of graphite lubrication layer adheres to and embeds on the surface of the pulled magnesium alloy wire. Therefore, removing the graphite lubrication layer on the surface of the magnesium alloy wire is the key to ensuring its application.

[0003] At present, the commonly used surface treatment methods for magnesium alloy wires are polishing and physical stripping. However, when polishing is used, since magnesium alloy wires are relatively soft and thin, and the graphite lubricating layer is embedded in the wire, it is very easy to cause excessive wear or graphite residue during the treatment process. At the same time, the fine graphite powder produced sticks to the surface of the wire and is not easy to remove, affecting the brightness and cleanliness of the wire. Although the physical stripping method can remove the surface layer, the graphite lubricating layer embedded in the surface of the wire is difficult to remove cleanly, and the surface finish is not good enough, which limits the application of magnesium alloy wires.

[0004] In summary, the existing method for removing the graphite lubricating layer on the surface of magnesium alloy wire has the problem of poor treatment effect and affects the smoothness of the wire. Summary of the invention

[0005] The object of the present invention is to provide a method for cleaning graphite lubricant residue on the surface of hot-drawn magnesium alloy wire, aiming to solve the technical problem that the existing method of removing the graphite lubricating layer on the surface of magnesium alloy wire in the prior art has poor treatment effect and affects the smoothness of the wire.

[0006] To achieve the above object, the present invention adopts a method for cleaning graphite lubricant residue on the surface of hot-drawn magnesium alloy wire, comprising the following steps:

[0007] Step 1: First, immerse the magnesium alloy wire in a pickling solution for pickling;

[0008] Step 2, washing the pickled magnesium alloy wire with water;

[0009] Step 3, immersing the water-washed magnesium alloy wire into an alkaline washing solution for alkaline washing;

[0010] Step 4: The alkali-washed magnesium alloy wire is washed with water and then dried to complete the cleaning of the graphite lubricant residue on the surface of the hot-drawn magnesium alloy wire.

[0011] Wherein, in step one, the pickling solution used includes 5-60g / L of component A, 5-60g / L of component B, 1-5g / L of penetrant, 0.01-5g / L of scale inhibitor, 0.5-2g / L of corrosion inhibitor and 0.01-5g / L of adsorbent.

[0012] Wherein, the component A is at least one of sulfuric acid, phosphoric acid, boric acid, carbonic acid, benzenesulfonic acid, sodium benzenesulfonate, sodium sulfate, ammonium sulfate, ammonium persulfate, potassium dihydrogen phosphate, sodium borate, sodium bicarbonate, and sodium carbonate;

[0013] The component B is at least one of citric acid, tartaric acid, lactic acid, formic acid, acetic acid, oxalic acid, sodium citrate, sodium tartrate, sodium potassium tartrate, sodium acetate, sodium oxalate, ammonium oxalate, and potassium titanium oxalate;

[0014] The penetrant is at least one of JFC, JFC-1, JFC-2, JFCE, sodium aminosulfonate, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and polyether;

[0015] The scale inhibitor is at least one of hydroxyethylidene diphosphonic acid, disodium ethylenediaminetetraacetate, aminotrimethylenephosphonic acid, diethylenetriaminepentamethylenephosphonic acid, and methylbenzotriazole;

[0016] The corrosion inhibitor is at least one of rhodamine, thiourea, sodium metasilicate pentahydrate, glycerol, ethylene glycol and sodium gluconate;

[0017] The adsorbent is at least one of bentonite, activated carbon, diatomaceous earth, silica gel and polyacrylamide.

[0018] Among them, in step 1, the specific method of first immersing the magnesium alloy wire in the pickling solution for pickling is:

[0019] At room temperature, the magnesium alloy wire is immersed in a pickling solution and pickled for 20-40 seconds under the assistance of ultrasonic waves;

[0020] Turn off the ultrasound and then pickle for 10-30 seconds. The magnesium alloy wire should be slightly swung during cleaning.

[0021] Wherein, in step three, the content of the alkaline washing solution used is 0.5-3g / L, and the alkaline washing solution is at least one of potassium hydroxide, sodium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate, sodium acetate, diethylenetriamine, and triethanolamine.

[0022] Among them, in step 3, the specific method of immersing the water-washed magnesium alloy wire in an alkaline washing solution for alkaline washing is:

[0023] At room temperature, the magnesium alloy wire is immersed in an alkaline cleaning solution for 2-10 seconds, and the magnesium alloy wire is slightly swung during the alkaline cleaning.

[0024] Among them, in step 4, the method of washing and drying the magnesium alloy wire after alkali washing is:

[0025] Blow dry with high pressure air and then dry at 60-80℃.

[0026] The invention discloses a method for cleaning residual graphite lubricant on the surface of hot-drawn magnesium alloy wire. The method comprises the following steps: firstly immersing the magnesium alloy wire in a pickling solution for pickling; then washing the pickled magnesium alloy wire with water; then immersing the washed magnesium alloy wire in an alkaline washing solution for alkaline washing; and then washing the alkaline washed magnesium alloy wire with water and drying it to complete the cleaning of residual graphite lubricant on the surface of the hot-drawn magnesium alloy wire. In this way, the technical problem that the existing method for removing the graphite lubricating layer on the surface of the magnesium alloy wire has poor treatment effect and affects the smoothness of the wire is solved.

[0027] The present invention first removes the graphite lubricating layer on the surface of the magnesium alloy wire, and then pickles it with the assistance of ultrasonic waves. On the one hand, the acid liquid penetrates the gaps of the graphite lubricating layer and reacts violently with magnesium, and the generated hydrogen gas impacts the graphite lubricating layer on the surface of the magnesium alloy wire, causing the graphite on the surface of the magnesium wire to loosen and fall off. On the other hand, the mechanical energy of the ultrasonic vibration can generate many vacuum holes in the solution. These holes generate strong vibrations when they are formed and closed, which have a violent impact on the graphite lubricating layer on the surface of the magnesium alloy wire, which is conducive to the penetration of the acid liquid, and promotes the destruction and peeling of the graphite lubricating layer adhered to and embedded on the surface of the magnesium wire. The sound pressure generated by the reflection of the ultrasonic wave in the solution also promotes the stirring and flow of the acid liquid, accelerates the replacement of the acid liquid on the surface of the magnesium alloy wire, and the nano-graphite that falls off quickly diffuses into the surrounding solution. The combined action of the ultrasonic wave and the acid liquid accelerates the removal process of the graphite lubricating layer, thereby reducing the corrosion of the magnesium alloy wire as much as possible, and ensuring that the graphite embedded on the surface of the magnesium alloy wire is cleanly removed.

[0028] After all the graphite embedded in the surface of the magnesium alloy wire is removed, many pits appear on its surface. At this time, the ultrasonic wave is stopped, and under the action of the pickling liquid, the dissolution rate of the magnesium wire surface is uneven, and the dissolution rate of the microscopic protrusions is greater than that of the concave parts, thereby flattening the surface of the magnesium alloy wire.

[0029] Then the residual acid on the surface of the magnesium wire is neutralized to prevent it from corroding the magnesium alloy wire. Finally, the magnesium wire with a bright surface and a silvery white metallic texture is obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 The diagram is a schematic diagram of the magnesium alloy wire before cleaning according to the method for cleaning graphite lubricant residue on the surface of the hot-drawn magnesium alloy wire of the present invention.

[0032] Figure 2 The present invention is a schematic diagram of a magnesium alloy wire after cleaning the graphite lubricant residue on the surface of a hot-drawn magnesium alloy wire according to the present invention. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0034] See also Figure 1 and Figure 2 ,in Figure 1 1 is a schematic diagram of the magnesium alloy wire before cleaning the graphite lubricant residue on the surface of the hot-drawn magnesium alloy wire according to the present invention, Figure 2 The present invention is a schematic diagram of a magnesium alloy wire after cleaning the graphite lubricant residue on the surface of a hot-drawn magnesium alloy wire according to the present invention.

[0035] The present invention provides a method for cleaning graphite lubricant residue on the surface of a hot-drawn magnesium alloy wire, comprising the following steps:

[0036] Step 1: At room temperature, immerse the magnesium alloy wire in a pickling solution, pickle it for 20-40 seconds with the assistance of ultrasound, turn off the ultrasound, and pickle it for another 10-30 seconds. The magnesium alloy wire should be slightly swung during cleaning.

[0037] Step 2, washing the pickled magnesium alloy wire with water;

[0038] Step 3: At room temperature, immerse the magnesium alloy wire in an alkaline cleaning solution for 2-10 seconds, and the magnesium alloy wire is slightly swung during the alkaline cleaning;

[0039] Step 4: After the alkali-washed magnesium alloy wire is washed with water, it is blown dry with high-pressure air, and then dried at 60-80° C. to complete the cleaning of the graphite lubricant residue on the surface of the hot-drawn magnesium alloy wire.

[0040] The pickling solution used includes 5-60g / L of component A, 5-60g / L of component B, 1-5g / L of penetrant, 0.01-5g / L of scale inhibitor, 0.5-2g / L of corrosion inhibitor and 0.01-5g / L of adsorbent.

[0041] The component A is at least one of sulfuric acid, phosphoric acid, boric acid, carbonic acid, benzenesulfonic acid, sodium benzenesulfonate, sodium sulfate, ammonium sulfate, ammonium persulfate, potassium dihydrogen phosphate, sodium borate, sodium bicarbonate, and sodium carbonate;

[0042] The component B is at least one of citric acid, tartaric acid, lactic acid, formic acid, acetic acid, oxalic acid, sodium citrate, sodium tartrate, sodium potassium tartrate, sodium acetate, sodium oxalate, ammonium oxalate, and potassium titanium oxalate;

[0043] The penetrant is at least one of JFC, JFC-1, JFC-2, JFCE, sodium aminosulfonate, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and polyether;

[0044] The scale inhibitor is at least one of hydroxyethylidene diphosphonic acid, disodium ethylenediaminetetraacetate, aminotrimethylenephosphonic acid, diethylenetriaminepentamethylenephosphonic acid, and methylbenzotriazole;

[0045] The corrosion inhibitor is at least one of rhodamine, thiourea, sodium metasilicate pentahydrate, glycerol, ethylene glycol and sodium gluconate;

[0046] The adsorbent is at least one of bentonite, activated carbon, diatomaceous earth, silica gel and polyacrylamide.

[0047] The content of the alkaline washing liquid used is 0.5-3g / L, and the alkaline washing liquid is at least one of potassium hydroxide, sodium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate, sodium acetate, diethylenetriamine, and triethanolamine.

[0048] First, the magnesium alloy wire is immersed in a pickling solution for pickling; the pickled magnesium alloy wire is washed with water; the washed magnesium alloy wire is immersed in an alkaline washing solution for alkaline washing; the alkaline washed magnesium alloy wire is washed with water and then dried to complete the cleaning of the graphite lubricant residue on the surface of the hot-drawn magnesium alloy wire, thereby solving the technical problem that the existing method of removing the graphite lubricating layer on the surface of the magnesium alloy wire in the prior art has poor treatment effect and affects the smoothness of the wire.

[0049] The present invention first removes the graphite lubricating layer on the surface of the magnesium alloy wire, and then pickles it with the assistance of ultrasonic waves. On the one hand, the acid liquid penetrates the gaps of the graphite lubricating layer and reacts violently with magnesium, and the generated hydrogen gas impacts the graphite lubricating layer on the surface of the magnesium alloy wire, causing the graphite on the surface of the magnesium wire to loosen and fall off. On the other hand, the mechanical energy of the ultrasonic vibration can generate many vacuum holes in the solution. These holes generate strong vibrations when they are formed and closed, which have a violent impact on the graphite lubricating layer on the surface of the magnesium alloy wire, which is conducive to the penetration of the acid liquid, and promotes the destruction and peeling of the graphite lubricating layer adhered to and embedded on the surface of the magnesium wire. The sound pressure generated by the reflection of the ultrasonic wave in the solution also promotes the stirring and flow of the acid liquid, accelerates the replacement of the acid liquid on the surface of the magnesium alloy wire, and the nano-graphite that falls off quickly diffuses into the surrounding solution. The combined action of the ultrasonic wave and the acid liquid accelerates the removal process of the graphite lubricating layer, thereby reducing the corrosion of the magnesium alloy wire as much as possible, and ensuring that the graphite embedded on the surface of the magnesium alloy wire is cleanly removed.

[0050] After all the graphite embedded in the surface of the magnesium alloy wire is removed, many pits appear on its surface. At this time, the ultrasonic wave is stopped, and under the action of the pickling liquid, the dissolution rate of the magnesium wire surface is uneven, and the dissolution rate of the microscopic protrusions is greater than that of the concave parts, thereby flattening the surface of the magnesium alloy wire.

[0051] Then the residual acid on the surface of the magnesium wire is neutralized to prevent it from corroding the magnesium alloy wire. Finally, the magnesium wire with a bright surface and a silvery white metallic texture is obtained.

[0052] When using the method for cleaning graphite lubricant residue on the surface of hot-drawn magnesium alloy wire of this embodiment,

[0053] Embodiment 1:

[0054] The present invention provides a method for cleaning graphite lubricant residue on the surface of a hot-drawn magnesium alloy wire, comprising the following steps:

[0055] Step 1: At room temperature, immerse the AZ31 magnesium alloy wire in a pickling solution, pickle it for 26 seconds under the assistance of ultrasound, turn off the ultrasound, and pickle it for another 20 seconds. The magnesium alloy wire should be slightly swung during cleaning;

[0056] Step 2, washing the pickled magnesium alloy wire with water;

[0057] Step 3: At room temperature, immerse the magnesium alloy wire in an alkaline cleaning solution for 2-10 seconds, and the magnesium alloy wire is slightly swung during the alkaline cleaning;

[0058] Step 4: After washing the alkali-washed magnesium alloy wire with water, blow dry it with high-pressure air, and dry it at 80° C. for 30 minutes to complete the cleaning of the graphite lubricant residue on the surface of the hot-drawn magnesium alloy wire.

[0059] In this embodiment, the pickling solution used includes 30 g / L sulfuric acid, 5 g / L sodium citrate, 1 g / L JFC, 0.02 g / L disodium ethylenediaminetetraacetate, 2 g / L glycerol, and 0.001 g / L activated carbon.

[0060] The alkaline washing solution used includes 2g / L sodium hydroxide and 1g / L sodium carbonate.

[0061] Embodiment 2:

[0062] The present invention provides a method for cleaning graphite lubricant residue on the surface of a hot-drawn magnesium alloy wire, comprising the following steps:

[0063] Step 1: At room temperature, immerse the WE43 magnesium alloy wire in a pickling solution, pickle it for 20 seconds with the assistance of ultrasound, turn off the ultrasound, and pickle it for another 25 seconds. The magnesium alloy wire should be slightly swung during cleaning.

[0064] Step 2, washing the pickled magnesium alloy wire with water;

[0065] Step 3: At room temperature, immerse the magnesium alloy wire in an alkaline cleaning solution for 2-10 seconds, and the magnesium alloy wire is slightly swung during the alkaline cleaning;

[0066] Step 4: After washing the alkali-washed magnesium alloy wire with water, blow dry it with high-pressure air, and dry it at 80° C. for 30 minutes to complete the cleaning of the graphite lubricant residue on the surface of the hot-drawn magnesium alloy wire.

[0067] In this embodiment, the pickling solution used includes 26 g / L sulfuric acid, 15 g / L oxalic acid, 12 g / L sodium tartrate, 0.5 g / L sodium aminosulfonate, 1 g / L hydroxyethylidene diphosphonic acid, 0.5 g / L thiourea and 1 g / L sodium metasilicate pentahydrate.

[0068] The alkaline wash solution used included 3 g / L potassium hydroxide.

[0069] Embodiment 3:

[0070] The present invention provides a method for cleaning graphite lubricant residue on the surface of a hot-drawn magnesium alloy wire, comprising the following steps:

[0071] Step 1: At room temperature, immerse the AZ80 magnesium alloy wire in a pickling solution, pickle it for 30 seconds with the assistance of ultrasound, turn off the ultrasound, and pickle it for another 15 seconds. The magnesium alloy wire should be slightly swung during cleaning.

[0072] Step 2, washing the pickled magnesium alloy wire with water;

[0073] Step 3: At room temperature, immerse the magnesium alloy wire in an alkaline cleaning solution for 2-10 seconds, and the magnesium alloy wire is slightly swung during the alkaline cleaning;

[0074] Step 4: After washing the alkali-washed magnesium alloy wire with water, blow dry it with high-pressure air, and dry it at 80° C. for 30 minutes to complete the cleaning of the graphite lubricant residue on the surface of the hot-drawn magnesium alloy wire.

[0075] In this embodiment, the pickling solution used includes 45 g / L formic acid, 20 g / L oxalic acid, 5 g / L sodium citrate, 1 g / L JFC-2, 0.3 g / L disodium ethylenediaminetetraacetate, 1 g / L ethylene glycol and 0.001 g / L diatomaceous earth.

[0076] The alkaline washing solution used includes 1 g / L sodium carbonate and 2 mL / L triethanolamine.

[0077] The diameters of the magnesium wires after cleaning in Example 1, Example 2 and Example 3 are shown in the following table:

[0078] Example Magnesium wire diameter before cleaning Magnesium wire diameter after cleaning Example 1 1.19mm 1.08mm Example 2 1.20mm 1.10mm Example 3 1.38mm 1.26mm

[0079] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A method for cleaning graphite lubricant residue on the surface of hot-drawn magnesium alloy wire, It is characterized in that The following steps are involved: Step 1: First, immerse the magnesium alloy wire in a pickling solution for pickling; Step 2, washing the pickled magnesium alloy wire with water; Step 3, immersing the water-washed magnesium alloy wire into an alkaline washing solution for alkaline washing; Step 4: The alkali-washed magnesium alloy wire is washed with water and then dried to complete the cleaning of the graphite lubricant residue on the surface of the hot-drawn magnesium alloy wire.

2. The method for cleaning graphite lubricant residue on the surface of hot-drawn magnesium alloy wire according to claim 1, characterized in that: In step 1, the pickling solution used includes 5-60 g / L of component A, 5-60 g / L of component B, 1-5 g / L of penetrant, 0.01-5 g / L of scale inhibitor, 0.5-2 g / L of corrosion inhibitor and 0.01-5 g / L of adsorbent.

3. The method for cleaning graphite lubricant residue on the surface of hot-drawn magnesium alloy wire according to claim 2, characterized in that: The component A is at least one of sulfuric acid, phosphoric acid, boric acid, carbonic acid, benzenesulfonic acid, sodium benzenesulfonate, sodium sulfate, ammonium sulfate, ammonium persulfate, potassium dihydrogen phosphate, sodium borate, sodium bicarbonate, and sodium carbonate; The component B is at least one of citric acid, tartaric acid, lactic acid, formic acid, acetic acid, oxalic acid, sodium citrate, sodium tartrate, sodium potassium tartrate, sodium acetate, sodium oxalate, ammonium oxalate, and potassium titanium oxalate; The penetrant is at least one of JFC, JFC-1, JFC-2, JFCE, sodium aminosulfonate, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and polyether; The scale inhibitor is at least one of hydroxyethylidene diphosphonic acid, disodium ethylenediaminetetraacetate, aminotrimethylenephosphonic acid, diethylenetriaminepentamethylenephosphonic acid, and methylbenzotriazole; The corrosion inhibitor is at least one of rhodamine, thiourea, sodium metasilicate pentahydrate, glycerol, ethylene glycol and sodium gluconate; The adsorbent is at least one of bentonite, activated carbon, diatomaceous earth, silica gel and polyacrylamide.

4. The method for cleaning graphite lubricant residue on the surface of hot-drawn magnesium alloy wire according to claim 3, characterized in that: In step 1, the magnesium alloy wire is first immersed in a pickling solution and pickled in the following specific manner: At room temperature, the magnesium alloy wire is immersed in a pickling solution and pickled for 20-40 seconds under the assistance of ultrasonic waves; Turn off the ultrasound and then pickle for 10-30 seconds. The magnesium alloy wire should be slightly swung during cleaning.

5. The method for cleaning graphite lubricant residue on the surface of hot-drawn magnesium alloy wire according to claim 4, characterized in that: In step three, the content of the alkaline washing solution used is 0.5-3g / L, and the alkaline washing solution is at least one of potassium hydroxide, sodium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate, sodium acetate, diethylenetriamine, and triethanolamine.

6. The method for cleaning graphite lubricant residue on the surface of hot-drawn magnesium alloy wire according to claim 5, characterized in that: In step 3, the magnesium alloy wire after water washing is immersed in an alkaline washing solution for alkaline washing in the following specific manner: At room temperature, the magnesium alloy wire is immersed in an alkaline cleaning solution for 2-10 seconds, and the magnesium alloy wire is slightly swung during the alkaline cleaning.

7. The method for cleaning graphite lubricant residue on the surface of hot-drawn magnesium alloy wire according to claim 6, characterized in that: In step 4, the magnesium alloy wire after alkali washing is washed with water and then dried as follows: Blow dry with high pressure air and then dry at 60-80℃.

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