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Method for plating TC4 titanium alloy threaded surface with copper

A thread surface, titanium alloy technology, applied in the field of copper plating on the TC4 titanium alloy thread surface, can solve the problems of high chemical activity of titanium elements, complex preparation process, poor bonding force, etc., to avoid the risk of serious environmental pollution, and the process is stable and reliable , Good anti-sticking effect

Inactive Publication Date: 2016-11-09
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, most of the thread anti-sticking technologies are lubricated, but few surface modification methods are used. This is because: (1) The chemical activity of titanium is high, and the surface is prone to oxidation, so the surface of titanium alloy is Electroplating or electroless plating is difficult to achieve; (2) The surface bonding force between the coating and the substrate is poor, and the quality of the coating cannot meet the technical requirements of the application
The existing TC4 titanium alloy copper plating process requires pre-plating treatment (such as pre-plating Ni layer first, then Cu plating), and its coating structure is composed of two layers of different components. The preparation process is complicated and the cost is high
There is also a process of using cyanide copper plating on the surface of titanium alloys, but on the one hand, cyanide is a huge poisonous substance, which is harmful to the human body; on the other hand, cyanide copper plating is not environmentally friendly and can easily cause serious environmental pollution.

Method used

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  • Method for plating TC4 titanium alloy threaded surface with copper
  • Method for plating TC4 titanium alloy threaded surface with copper
  • Method for plating TC4 titanium alloy threaded surface with copper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Copper-plated internal thread surface for TC4 titanium alloy 3 1 / 2" oil pipe coupling

[0060] Solution formula: ① Alkali washing solution: NaOH 75g / L; NaOH 3 PO 4 20g / L ②Pickling solution: HF 100ml / L; HNO 3 300ml / L; distilled water 600 ml / L ③Activation solution: Na 2 Cr 2 o 7 180 g / L; HF 50ml / L ④ Plating solution: CuSO 4 • 5H 2 O 150 g / L; H 2 SO 4 60ml / L ⑤passivation solution: CrO 3 80 g / L; NaCl 1.0 g / L; H 2 SO 4 25ml / L.

[0061] Implementation: see Figure 7 , including the following steps, ①alkali washing: place the workpiece in an alkali washing solution with a temperature of 65°C and soak for 15 minutes; ②water washing: rinse the workpiece after alkali washing with running water; ③acid washing: place the workpiece after washing Soak in pickling solution at room temperature for 2 minutes to carry out surface corrosion treatment; ④ Washing: Rinse the pickled workpiece with running water; ⑤ Activation treatment: Soak the washed workpiece in an activ...

Embodiment 2

[0064] Copper-plated internal thread surface for TC4 titanium alloy 3 1 / 2" oil pipe coupling

[0065] Solution formula: ① Alkali washing solution: NaOH 85g / L; NaOH 3 PO 4 22.5g / L ②Pickling solution: HF 150ml / L; HNO 3 350 ml / L; distilled water 500 ml / L ③Activation solution: Na 2 Cr 2 o 7 210 g / L; HF 65ml / L ④ Plating solution: CuSO 4 • 5H 2 O 180 g / L; H 2 SO 4 70ml / L ⑤passivation solution: CrO 3 85 g / L; NaCl 1.5 g / L; H 2 SO 4 27.5ml / L.

[0066] Implementation: see Figure 7 , including the following steps, ①alkali washing: place the workpiece in an alkali washing solution with a temperature of 70°C and soak for 12 minutes; ②water washing: rinse the workpiece after alkali washing with running water; ③acid washing: place the workpiece after washing Soak in pickling solution at room temperature for 1.5 minutes to carry out surface corrosion treatment; ④ Washing: Rinse the pickled workpiece with running water; ⑤ Activation treatment: Soak the washed workpiece in an...

Embodiment 3

[0069] Copper-plated internal thread surface for TC4 titanium alloy 3 1 / 2" oil pipe coupling

[0070] Solution formula: ① Alkali washing solution: NaOH 100g / L; NaOH 3 PO 4 25g / L ②Pickling solution: HF 200ml / L; HNO 3 400 ml / L; distilled water 400 ml / L ③Activation solution: Na 2 Cr 2 o 7 250 g / L; HF 80ml / L ④ Plating solution: CuSO 4 • 5H 2 O 200 g / L; H 2 SO 4 80ml / L ⑤passivation solution: CrO 3 90 g / L; NaCl 2.0 g / L; H 2 SO 4 30ml / L.

[0071] Implementation: see Figure 7 , including the following steps, ①alkali washing: place the workpiece in an alkali washing solution with a temperature of 80°C and soak for 10 minutes; ②water washing: rinse the workpiece after alkali washing with running water; ③acid washing: place the workpiece after washing Soak in pickling solution at room temperature for 1 minute to carry out surface corrosion treatment; ④Water washing: Rinse the pickled workpiece with running water; ⑤Activation treatment: Soak the washed workpiece in an a...

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Abstract

The invention relates to the technical field of metal material surface modification, in particular to a method for plating a TC4 titanium alloy threaded surface with copper. The method sequentially includes the following steps of firstly, alkaline washing, secondly, water washing, thirdly, acid pickling, fourthly, water washing, fifthly, activating treatment, sixthly, water washing, seventhly, electroplating, eighthly, cleaning, ninthly, passivating and tenthly, cleaning and drying, wherein NaOH and Na3PO4 are dissolved in distilled water, and alkaline wash used in the first step is obtained; an acid pickling solution used in the third step comprises HF, HNO3 and H20; Na2Cr2O7 and HF are dissolved in distilled water, and activate fluid used in the fifth step is obtained; and CrO3, NaCl and H2SO4 are dissolved in distilled water, and a passivating solution used in the ninth step is obtained. The method is simple in process, convenient to implement, low in cost, easy to implement and high in production efficiency; and meanwhile, a modified threaded portion has the higher plastic shearing resistance and wear resistance, and the thread sticking problem is solved.

Description

technical field [0001] The invention relates to the technical field of surface modification of metal materials, in particular to a method for copper plating on the surface of TC4 titanium alloy threads. Background technique [0002] Titanium alloy has high strength and its density is generally 4.5g / cm 3 About 60% of steel, about 1 / 2 of nickel-based alloys, the strength of pure titanium is close to that of ordinary steel, and the strength of some high-strength titanium alloys is much higher than that of many alloy structural steels. Therefore, the ratio of titanium alloys The strength is much greater than that of alloy steel and nickel-based alloys. Titanium alloy has high thermal strength, and still has high strength and specific strength in the temperature range not higher than 350 °C. Titanium alloy has good low-temperature performance, and can still maintain good mechanical properties at low and ultra-low temperatures. Titanium alloy has good corrosion resistance. It w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D7/00C25D3/38
CPCC25D7/003C25D3/38
Inventor 姚小飞田伟陈建吕煜坤杨巍
Owner XIAN TECHNOLOGICAL UNIV
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