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Surface treatment method for titanium alloy ingot blank

A treatment method and surface treatment technology, applied in jewelry and other directions, can solve the problems of reducing product yield and increasing production cost, and achieve the effect of eliminating internal stress, enhancing surface bonding force and uniform distribution.

Active Publication Date: 2022-05-27
WESTERN METAL MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the presence of welds along the axial direction of the ingot outside the copper sheath, the surface of the tube blank obtained after hot extrusion has defects, usually long and deep grooves are formed on the surface along the axial direction of the tube blank , the finished product rate is reduced, and the production cost is increased

Method used

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  • Surface treatment method for titanium alloy ingot blank
  • Surface treatment method for titanium alloy ingot blank
  • Surface treatment method for titanium alloy ingot blank

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preparation example Construction

[0035] The present invention also provides a method for preparing a titanium alloy tube blank. The titanium alloy tube blank is obtained by hot extrusion of the metal double-coated titanium alloy ingot described in the above technical solution.

[0036] In the present invention, the hot extrusion method is preferably as follows: the ingot is heated and kept warm first, and then the ingot is extruded. , more preferably 870-930°C, and the heating and heat preservation time is preferably 120-250 min, more preferably 150-210 min. In a specific embodiment of the present invention, the ingot is preferably placed in a box-type resistance furnace for heating and heat preservation, and after the heat preservation is completed, the heat preservation ingot is taken out and extruded; the extrusion is preferably performed by using a 2000T extruder. .

[0037] In the present invention, after the hot extrusion, the method further includes: straightening and pickling the ingot after the hot ...

Embodiment 1

[0041] Surface treatment of TC4 titanium alloy ingot for extrusion and preparation of tube blank, the steps are:

[0042] Step 1: Chemically remove oil from the TC4 titanium alloy extrusion ingot with a size of Φ215×Φ50×500mm. The degreasing solution used for chemical degreasing is composed of sodium hydroxide, sodium carbonate, sodium phosphate and water. Among them, hydrogen The concentration of sodium oxide is 60g / L, the concentration of sodium carbonate is 30g / L, the concentration of sodium phosphate is 45g / L, the degreasing temperature is 50℃, and the degreasing time is 30min.

[0043] Step 2: pickling the TC4 titanium alloy ingot for extrusion after degreasing, the volume ratio of hydrofluoric acid, nitric acid and water in the pickling solution used is 1:2:5, and the acid treatment is carried out at room temperature for 20s .

[0044] Step 3: Activating the ingot for extrusion of TC4 titanium alloy after pickling, the activation solution used in the activation treatmen...

Embodiment 2

[0061] Surface treatment and preparation of billet for TC19 titanium alloy extrusion, the steps are:

[0062] Step 1: Chemically remove oil from the TC19 titanium alloy extrusion ingot with a size of Φ180×Φ60×430mm. The oil removal solution used for chemical oil removal is composed of sodium hydroxide, sodium carbonate, sodium phosphate and water. Among them, hydrogen The concentration of sodium oxide is 50g / L, the concentration of sodium carbonate is 40g / L, the concentration of sodium phosphate is 50g / L, the degreasing temperature is 60°C, and the degreasing time is 20min.

[0063] Step 2: pickling the TC19 titanium alloy ingot for extrusion after degreasing, the volume ratio of hydrofluoric acid, nitric acid and water in the pickling solution used is 1:2:5, and the acid treatment is carried out at room temperature for 15s .

[0064] Step 3: The ingot for extrusion of TC19 titanium alloy after pickling is subjected to activation treatment, and the activation solution used in...

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Abstract

The invention relates to the technical field of titanium alloy surface treatment, and provides a surface treatment method of a titanium alloy ingot blank. The titanium alloy ingot blank is sequentially subjected to oil removal, acid pickling, activating treatment, nickel electroplating, heat treatment and copper electroplating. According to the method, the surface of the ingot blank is pretreated through oil removal, acid pickling and activating treatment to improve the binding force of a plating layer and the titanium alloy ingot blank, then the nickel plating layer serves as an inner coating layer to prevent the titanium alloy ingot blank from reacting with copper, the internal stress of the nickel plating layer is eliminated through heat treatment, the ductility of the nickel plating layer is improved, the nickel plating layer and a base body are mutually diffused, and the corrosion resistance of the titanium alloy ingot blank is improved. And finally, the copper plating layer is used as an outer coating layer of the titanium alloy ingot blank, and the copper plating layer plays a lubricating role when the titanium alloy ingot blank is extruded. Compared with a conventional copper sheet coating layer, the obtained lubricating layer is more beneficial to uniform distribution of extrusion stress on an ingot blank, and surface defects during subsequent extrusion preparation of a pipe blank are reduced.

Description

technical field [0001] The invention relates to the technical field of titanium alloy surface treatment, in particular to a surface treatment method of a titanium alloy ingot. Background technique [0002] During the process of hot extrusion of titanium alloy ingots to prepare tube blanks, lubrication between the ingots and the molds is required. The main purposes of lubrication are as follows: 1. Reduce the friction between the ingots and the molds and protect the molds from wear on their surfaces. , to improve the service life of the mold and improve the surface quality of the tube blank; 2. Reduce the extrusion force during the forming process to ensure that the hot extrusion of the ingot can be carried out smoothly. [0003] At present, before the hot extrusion of titanium alloy ingots, the surface is usually treated to achieve the effect of lubrication. There are usually three ways: the first is to lubricate with grease. The grease is made of graphite, molybdenum disulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/12C25D7/04C25D7/00C25D5/38
CPCC25D5/12C25D7/04C25D7/00C25D5/38
Inventor 侯鹏葛鹏席锦会刘宇王瑞琴刘姣
Owner WESTERN METAL MATERIAL
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