Surface treatment process for improving high-temperature wear resistance of stirring head

Abstract

The invention discloses a surface treatment process for improving the high-temperature wear resistance of a stirring head. The surface treatment process comprises the following steps: 1) cleaning a stirring needle and the bottom of a shaft shoulder for three times by using distilled water, and blow-drying for plating; (2) dipping a plating pen in the composite brush plating solution to carry out electroplating brush treatment on the stirring needle and the bottom surface of the shaft shoulder, wherein the thickness of a plating layer is not less than 80 microns; the composite brush plating solution comprises a nickel-cobalt plating solution, tungsten nitride, chromium nitride and composite powder, wherein the composite powder comprises metal titanium powder, tin powder and chromium powder; by adopting the composite brush plating technology, the stirring needle and the shaft shoulder bottom of the stirring head are subjected to local surface treatment, the hardness of the stirring needle and the shaft shoulder bottom subjected to brush plating is obviously improved, the room-temperature and high-temperature wear resistance is obviously improved, the service life of the stirring head is prolonged, and the production cost of an enterprise is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of friction stir welding, in particular to a surface treatment process of a stirring head for a friction stir welding machine. Background Art

[0002] The stirring tip is the key to friction stir welding (FSW) technology and is often called the heart of FSW. The quality of the stirring tip not only determines the performance of the FSW joint but also the production cost. The stirring tip consists of a shoulder, a clamping element, and a stirring pin. During FSW, the pin is inserted into the interface of the welded materials while rotating and advancing along the weld at a constant speed. The bottom of the shoulder must fit tightly against the surface of the base material, maintaining a certain amount of penetration. Therefore, the working environment of the stirring pin and the bottom of the shoulder during FSW is relatively harsh, requiring high wear resistance, especially at high temperatures. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a surface treatment process for improving the high-temperature wear performance of a stirring head. The surface treatment process for improving the high-temperature wear performance of a stirring head adopts a composite brush plating technology to perform local surface treatment on the stirring needle and the bottom of the shoulder of the stirring head. The hardness of the stirring needle and the bottom of the shoulder after brush plating is significantly improved, and the room temperature and high temperature wear resistance is significantly improved, thereby extending the service life of the stirring head and reducing the production cost of the enterprise.

[0004] In order to achieve the above object, the present invention provides a surface treatment process for improving the high temperature wear performance of a stirring head, the steps of which are as follows: 1) Wash the stirring needle and the bottom of the shoulder with distilled water three times and blow dry before plating. 2) Using a plating pen dipped in a composite brush plating solution, electroplating the stirring pin and the bottom surface of the shoulder is performed on the surface. The thickness of the plating solution layer is set to be not less than 80 μm. The composite brush plating solution includes nickel-cobalt plating solution, tungsten nitride, chromium nitride and composite powder. The composite powder includes metal titanium powder, tin powder and chromium powder.

[0005] Furthermore, in step 2), 0.6-1.0 g of tungsten nitride, 0.1-0.5 g of chromium nitride and 6-20 g of composite powder are added to each liter of nickel-cobalt plating solution.

[0006] Furthermore, in step 2), nickel accounts for 20-35 wt% of the nickel-cobalt plating solution, and the balance is cobalt.

[0007] Furthermore, in step 2), the composite powder contains 20-40 wt% of strontium, 15-25 wt% of indium, and the balance is vanadium.

[0008] Furthermore, in step 2), the composite powder contains 20-40 wt% of strontium, 15-25 wt% of indium, and the balance is vanadium.

[0009] Furthermore, in step 2), the particle size of the composite powder is set to 25-50 μm.

[0010] Furthermore, in step 2), the operating parameters are as follows: temperature: 40-60° C., brush plating time: 10-40 min, brush plating voltage: 5-10 V, and plating pen movement speed: 10-25 m / min.

[0011] The beneficial effects of the present invention are: 1. The surface treatment process of the stirring head of the present invention adopts composite brush plating technology to perform local surface treatment on the stirring needle and the bottom of the shaft shoulder of the stirring head. After brush plating, the hardness of the stirring needle and the bottom of the shaft shoulder is significantly improved, and the wear resistance at room temperature and high temperature is significantly improved, thereby extending the service life of the stirring head and reducing the production cost of the enterprise; 2. The surface treatment process of the stirring head of the present invention is achieved by mixing and adding tungsten nitride, chromium nitride and composite powder into the nickel-cobalt plating solution, wherein the composite powder includes metal titanium powder, tin powder and chromium powder. The wear resistance of the stirring needle electroplating layer is improved by combining tungsten nitride and chromium nitride with the nickel-cobalt plating solution, the high temperature resistance of the stirring needle electroplating layer is improved by combining metal titanium powder with the nickel-cobalt plating solution, the toughness of the stirring head electroplating layer is improved by combining tin powder with the nickel-cobalt plating solution, and the wear resistance and toughness of the stirring needle electroplating layer at medium and low temperatures are improved by combining chromium powder with the nickel-cobalt plating solution. The mechanical properties of the stirring needle are comprehensively improved, the service life of the stirring head is extended, and the production cost of the enterprise is reduced.

[0012] 3. The surface treatment process of the stirring head of the present invention adopts a local surface treatment process of composite brush plating, which effectively avoids the overall surface treatment of the stirring head, saves energy and improves efficiency. DETAILED DESCRIPTION

[0013] The present invention provides a surface treatment process for improving the high-temperature wear performance of a stirring head, comprising the following steps: 1) Wash the stirring needle and the bottom of the shoulder with distilled water three times and blow dry before plating. 2) Brush plating the stirring pin and the bottom surface of the shaft shoulder with a composite brush plating solution dipped in a plating pen, wherein the thickness of the plating solution layer is set to be not less than 80 μm; wherein the composite brush plating solution comprises nickel-cobalt plating solution, tungsten nitride, chromium nitride and composite powder, wherein the composite powder comprises metal titanium powder, tin powder and chromium powder.

[0014] This embodiment adds tungsten nitride, chromium nitride and a composite powder to the nickel-cobalt plating solution, wherein the composite powder includes metal titanium powder, tin powder and chromium powder. The wear resistance of the stirring needle and the bottom of the shoulder is improved by combining tungsten nitride and chromium nitride with the nickel-cobalt plating solution, the high temperature resistance of the stirring needle and the bottom of the shoulder is improved by combining metal titanium powder with the nickel-cobalt plating solution, the toughness of the stirring needle and the bottom of the shoulder is improved by combining tin powder with the nickel-cobalt plating solution, and the wear resistance and toughness of the stirring needle and the bottom of the shoulder are improved by combining chromium powder with the nickel-cobalt plating solution. The performance of the stirring head is comprehensively improved, the service life of the stirring head is extended, and the production cost of the enterprise is reduced.

[0015] Furthermore, in step 2), preferably, 0.6 to 1.0 g of tungsten nitride, 0.1 to 0.5 g of chromium nitride and 6 to 20 g of composite powder are added to each liter of nickel-cobalt plating solution. The proportion of each component in this embodiment is set as the preferred embodiment of this embodiment, and the wear resistance of the stirring needle and the bottom of the shoulder is improved by no less than 30% based on the existing technology.

[0016] Furthermore, in step 2), preferably, nickel accounts for 20-35 wt% of the nickel-cobalt plating solution, and the balance is cobalt.

[0017] Furthermore, in step 2), preferably, the composite powder contains 20-40 wt% of strontium, 15-25 wt% of indium, and the balance is vanadium.

[0018] Furthermore, in step 2), preferably, the composite powder contains 20-40 wt% of strontium, 15-25 wt% of indium, and the balance is vanadium.

[0019] Furthermore, in step 2), the particle size of the composite powder is preferably set to 25-50 μm.

[0020] Further, in step 2), the composite brush plating equipment in this embodiment preferably includes a brush plating power supply, an infusion pump, a rotor, a brush plating pen and a plating solution circulation component, and its operating parameters are as follows: temperature: 40~60℃, brush plating time: 10~40min, the voltage for plating the composite coating is 5V~10V, and the plating pen movement speed is: 10~25 / min.

[0021] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A surface treatment process for improving the high-temperature wear resistance of a stirring head, characterized by: The steps are as follows: 1) Wash the stirring needle and the bottom of the shoulder with distilled water three times and blow dry before plating. 2) Use a plating pen to dip into a composite brush plating solution to perform electroplating brush treatment on the bottom surface of the stirring pin and the shoulder, and the plating thickness is not less than 80μm; the composite brush plating solution includes nickel-cobalt plating solution, tungsten nitride, chromium nitride and composite powder, and the composite powder includes metal titanium powder, tin powder and chromium powder.

2. The surface treatment process for improving the high-temperature wear resistance of a stirring head according to claim 1, characterized in that: In step 2), 0.6-1.0 g of tungsten nitride, 0.1-0.5 g of chromium nitride and 6-20 g of composite powder are added to each liter of nickel-cobalt plating solution.

3. A surface treatment process for improving the high-temperature wear resistance of a stirring head according to claim 1 or 2, characterized in that: In step 2), nickel accounts for 20-35 wt% of the nickel-cobalt plating solution, and the balance is cobalt.

4. A surface treatment process for improving the high-temperature wear resistance of a stirring head according to claim 1 or 2, characterized in that: In step 2), the composite powder contains 20-40 wt% of strontium, 15-25 wt% of indium, and the balance is vanadium.

5. The surface treatment process for improving the high-temperature wear resistance of a stirring head according to claim 4, characterized in that: In step 2), the composite powder contains 20-40 wt% of strontium, 15-25 wt% of indium, and the balance is vanadium.

6. The surface treatment process for improving the high-temperature wear resistance of a stirring head according to claim 1, characterized in that: In step 2), the particle size of the composite powder is 25 to 50 μm.

7. The surface treatment process for improving the high-temperature wear resistance of a stirring head according to claim 1, characterized in that: In step 2), the operating parameters are as follows: temperature: 40-60° C., brush plating time: 10-40 min, brush plating voltage: 5-10 V, and plating pen movement speed: 10-25 m / min.