Method for plating tin-copper alloys on surfaces of TC4 titanium alloys and TC4 titanium alloy module

A technology of titanium alloy and tin-plated copper, which is applied in the field of steel pipe manufacturing, can solve the problems of poor bonding force of the coating, and achieve the effects of easy operation, excellent wear resistance and stable process

Inactive Publication Date: 2020-03-27
HENGYANG VALIN STEEL TUBE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for plating tin-copper alloy on the surface of TC4 titanium alloy and TC4 titani...

Method used

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  • Method for plating tin-copper alloys on surfaces of TC4 titanium alloys and TC4 titanium alloy module
  • Method for plating tin-copper alloys on surfaces of TC4 titanium alloys and TC4 titanium alloy module
  • Method for plating tin-copper alloys on surfaces of TC4 titanium alloys and TC4 titanium alloy module

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A method for copper-tin alloy plating of TC4 titanium alloy oil casing collars, the process is as follows figure 1 As shown, the method includes the following steps:

[0042] (1) High-temperature chemical degreasing: immerse the titanium alloy oil casing coupling in an alkaline degreasing solution at a temperature of about 70°C for chemical degreasing, wherein the alkaline solution includes 12g / L sodium hydroxide, 21g / L triphosphate Sodium and 25mL / L BH-7 multifunctional alkaline degreaser, of which BH-7 multifunctional alkaline degreaser is provided by Guangzhou Erqing Research Institute.

[0043] (2) Ultrasonic degreasing: immerse the coupling in an alkaline degreasing liquid with a temperature of about 60°C for ultrasonic degreasing.

[0044] (3) Water washing: wash the degreasing coupling in running water.

[0045] (4) Neutralization: immerse the washed coupling in 5% sulfuric acid solution for 30 seconds to neutralize the residual alkali on the surface.

[0046]...

Embodiment 2

[0078] The difference with Example 1 is: in the pre-nickel treatment step, the current density is 4 amperes / square decimeter, the time is 5 min, and in the titanium alloy pre-nickel solution, the volume content of the titanium alloy pre-nickel agent is 33%.

[0079] The test results show that the coating of the oil casing coupling is blistered, and the copper coating on the thread and sealing surface is peeled off after six times of make-up and break-up experiments (make-up torque 11000N×M).

Embodiment 3

[0081] The difference from Example 1 is that steps (9) to (12) are not performed.

[0082] The test results show that the coating of the oil casing coupling is blistered, and the copper coating on the thread and sealing surface has fallen off after three times of make-up and break-up experiments (make-up torque 11000N×M).

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Abstract

The invention provides a method for plating tin-copper alloys on surfaces of TC4 titanium alloys and a TC4 titanium alloy module. The method comprises the steps that the surfaces of TC4 titanium alloytarget modules are treated to remove oil stains on the surfaces of the target modules; a first electroplating process is adopted to preplate tin on the surface-treated target modules to form nickel pre-plated layers on the surfaces of the target modules; the target modules are heated after the nickel preplating treatment; a second electroplating process is adopted to perform the nickel impact treatment on the heated target modules to form nickel impacted layers; and a third electroplating process is adopted to plate the copper-tin alloys on the surfaces of the nickel impacted layers to form copper-tin alloy layers. The method can be adopted to prepare the uniform and compact copper-tin alloy layers with excellent wear resistance on the surfaces of the TC4 titanium alloy target modules; and the process is stable in process and convenient to operate, so that the application field of the TC4 titanium alloy target modules can be greatly widened.

Description

technical field [0001] The invention relates to the field of steel pipe manufacturing, in particular to a method for plating tin-copper alloy on the surface of a TC4 titanium alloy and a TC4 titanium alloy component. Background technique [0002] TC4 titanium alloy is a widely used titanium alloy, which can also be expressed as Ti-6Al-4V, mainly including 5.5-6.75wt% Al, 3.5-4.5wt% V, and the balance of titanium. The oil field has strict requirements on the adhesion of the oil casing coupling, and usually adopts phosphating or electroplating to modify the surface of the internal thread of the coupling. Electroplated copper-tin alloy has excellent wear resistance and sticking resistance, and is widely used in the surface modification treatment of the internal thread of the oil casing coupling. Titanium alloy is a good choice for high-strength corrosion-resistant oil casing, but titanium alloy has strong self-passivation performance, and a dense oxide film will be formed imme...

Claims

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Application Information

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IPC IPC(8): C25D5/14C25D3/12C25D5/38C25D5/48C25D3/56
CPCC25D3/12C25D3/56C25D5/14C25D5/38C25D5/50
Inventor 田研周勇付强李小兵
Owner HENGYANG VALIN STEEL TUBE
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