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Composite pretreatment agent for cold drawing of titanium and titanium alloys

A pretreatment agent, titanium alloy technology, applied in the direction of metal material coating process, can solve the problems of unsatisfactory effect and high processing cost of titanium and titanium alloy cold drawing processing, to ensure forming efficiency and quality, processing technology Simple, high evaporation temperature effect

Active Publication Date: 2015-10-14
DALIAN SUNNY TITANIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the process is relatively simple, the processing cost is high, and the effect on cold drawing of titanium and titanium alloys is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Mix potassium fluoride 5g / l, sodium oxalate 10g / l and oxalic acid 30g / l to prepare an aqueous solution with a pH value of 2.

[0008] Select TC4 (Ti-6Al-4V) wire with an original diameter of Φ5.50mm, anneal at 760°C for 2 hours, remove scale, and dip-coat with the aqueous solution of Example 1 of the present invention. The dip-coating temperature is 40°C, and the treatment time is for 20min. Drawing at a constant speed on the drawing machine, the drawing speed is 100mm / s, 6 passes of drawing are successfully realized, the total compression rate can reach 62%, and the wire material of Ф3.45mm is obtained by cold deformation. During the cold drawing process, the drawing deformation is smooth, no volatile fumes are produced, no mold sticking and breaking phenomenon, and the metallurgical quality and performance of the formed wire are good.

Embodiment 2

[0010] Mix potassium fluoride 25g / l, sodium oxalate 15g / l and oxalic acid 7g / l to prepare an aqueous solution with a pH value of 3.

[0011] Select TC4 (Ti-6Al-4V ELI) wire with an original diameter of Φ6.50mm, anneal at 780°C for 2 hours, remove scale, and dip-coat with the aqueous solution of Example 2 of the present invention at a dip-coating temperature of 60°C. The time is 15 minutes. On the drawing machine, a constant speed drawing is adopted, and the drawing speed is 80mm / s, and the drawing of 6 passes is successfully realized, and the wire material of Ф4.15mm is obtained by cold deformation. During the cold drawing process, the drawing deformation is smooth, and the metallurgical quality and performance of the formed wire are good.

Embodiment 3

[0013] Mix potassium fluoride 20g / l, sodium oxalate 5g / l and oxalic acid 20g / l to prepare an aqueous solution with a pH value of 3.

[0014] Select the Ф7.0mm TC4 bar material that has been annealed at 800°C for 2 hours and descaled, soaked in the aqueous solution of Example 3 of the present invention, the soaking temperature is 55°C, and the treatment time is 15 minutes. Using a constant drawing speed of 60mm / s, the Ф7.0mm bar is cold drawn for 5 passes to make a Ф5.5mm wire. The cold drawing process does not produce volatile fumes, no sticky molds and pull-off phenomena, and high-quality wires are obtained.

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Abstract

The invention discloses a composite pretreating agent for cold drawing of titanium and a titanium alloy, which is characterized in that: the pretreating agent is an aqueous solution which is prepared by mixing potassium fluoride, sodium oxalate, oxalic acid and water and has the pH value of 2 to 4, wherein each 1l of aqueous solution comprises 5 to 25g of potassium fluoride, 10 to 35g of sodium oxalate, 5 to 30g of oxalic acid and the balance of water. The pretreating agent for the cold drawing of the titanium or the titanium alloy is low in cost; a conversion film layer with the thickness of 2 to 30mu m can be formed on the surface of the titanium or the titanium alloy at one time under the combined action of the components, the lubrication effect is good, a few oxides are generated in the cold drawing process, and the forming efficiency and quality of titanium and titanium alloy bars and wires are ensured; and the treatment process is simple, the production efficiency of products is improved, and the production cost of the products is reduced.

Description

technical field [0001] The invention relates to the field of processing titanium and titanium alloys, in particular to a composite pretreatment agent for cold drawing of titanium and titanium alloys which has low cost, simple process and can improve product quality and production efficiency. Background technique [0002] The rods and wires of titanium and titanium alloys are basically processed by rolling, but for wires with small diameters, drawing processing is required, especially when the uniformity of quality and performance is required, cold drawing is often required. Drawing and forming. Due to the high deformation resistance, low plasticity, and difficulty in processing of titanium and titanium alloys, and the serious hardening effect of cold drawing and difficulty in lubrication, the pretreatment of titanium and titanium alloy cold drawing is mostly carried out in two steps at present, that is, first A modified covering film is formed on the surface of titanium or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C9/02C23C22/46
Inventor 蒋志张久文
Owner DALIAN SUNNY TITANIUM IND