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Surface composite treatment method of valve workpiece

A treatment method and surface composite technology, applied in the field of wear-resistant and corrosion-resistant valve surface treatment, valve surface composite treatment field, can solve the problems of poor protection performance of protective layer, unenvironmental protection, low cost, etc., and achieve broad market promotion and application prospects. Effect

Inactive Publication Date: 2019-10-08
SHAANXI TIANYUAN MATERIALS PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the commonly used surface treatment techniques, spraying such as thermal spraying and laser cladding, although the prepared protective layer has better protection performance, due to its special spraying design, it is not suitable for surfaces with too complex shapes or diameters less than 90 mm inner hole, and the cost is higher
Electroplating and chemical plating are low in cost, adopt liquid deposition methods, have good filling properties, and can meet the surface treatment requirements of various shapes, especially for slender holes, which have unique advantages, but their protective layer protection performance is poor , and not environmentally friendly
Galvanizing and Alloy Atomic Infiltration (ADA) are similar in performance to electroplating and electroless plating, and can protect the surface of parts with complex shapes at low cost, but the protective layer has poor wear resistance and only has corrosion resistance

Method used

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  • Surface composite treatment method of valve workpiece
  • Surface composite treatment method of valve workpiece
  • Surface composite treatment method of valve workpiece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Combination valves (such as figure 1 ) is a key wearing part of the water injection pump used in oil fields. During use, the flow channel is corroded by underground water containing high concentrations of chloride ions and sulfide ions, and the sealing surface is corroded and worn. Due to the unique and complex structure of the combined valve, it is a suitable surface strengthening method to use the present invention to perform surface treatment on valves and different parts of the valves in different working conditions.

[0080] The combined valve is made of 35 steel. First, the sealing surface of the combined valve is treated with laser cladding. The main cladding process parameters are as follows: the temperature difference of the substrate during the printing process is less than 50°C, the laser power is 1000W, and the printing distance (the distance between the cladding head and the workpiece surface Distance) 15 mm, powder feeding amount 20g / min, lap rate 60%, wor...

Embodiment 2

[0090] figure 2 It is an ordinary low-pressure oil pipeline valve. The tapered sealing surface of the valve stem is treated by laser cladding to enhance its wear resistance and corrosion resistance. Require.

[0091] The material of the valve is carbon steel. The specific laser cladding process is as follows: the temperature difference of the substrate during the printing process is less than 50°C, the laser power is 1000W, the printing distance (the distance between the cladding head and the surface of the workpiece) is 15 mm, and the powder feeding rate is 20g / min. The layer overlap rate is 60%, the moving line speed of the workpiece is 15 mm / s, the printing angle is 90, and printing is performed 4 times. The powder used is nickel-based self-fluxing alloy Ni60A with a particle size of 50-75 microns. The specific composition is as follows:

[0092]

[0093] After the cladding is completed and the sphere is completely cooled, the thickness of the cladding layer is tested ...

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Abstract

The invention provides a surface composite treatment method of a valve workpiece. The method includes the following steps that firstly, a laser cladding technology is adopted for performing surface treatment on the sealing face of the valve workpiece, and a laser cladding layer in a preset thickness is formed on the sealing face; secondly, an alloy atom permeating technology is adopted for treating other surfaces, except the sealing face, of the valve workpiece, and alloy atom permeating coatings are formed on the other surfaces; and thirdly, after-treatment is performed on the laser claddinglayer formed in the first step. According to the method, based on long-time industrial practice and application experience, directing at the current condition that different portions of a valve are different in abrasion resisting and corrosion resisting requirements under different using work conditions, the surface treatment technology that laser cladding treatment and alloy atom permeating treatment are combined is put forwards firstly, the abrasion resisting and corrosion resisting requirements of valve type products under different using work conditions are met, the comprehensive requirements of manufacturability and economical efficiency are both taken into consideration very well, important reference significance is provided for treatment of the surface of the workpiece under other similar requirements, and the market prospect is broad.

Description

technical field [0001] The invention relates to a processing method for a valve surface, in particular to a wear-resistant and corrosion-resistant treatment method for a valve surface, and more specifically to a composite treatment method for a valve surface under different operating conditions. Background technique [0002] The valve is a control component in the fluid delivery system, which has functions such as cut-off, adjustment, flow diversion, reverse flow prevention, pressure stabilization, flow diversion or overflow pressure relief. It can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media, and is widely used in various fields of industrial production. According to the difference of working conditions, valves are also divided into cast iron valves, cast steel valves, stainless steel valves (201, 304, 316, etc.), chrome-molybdenum steel valves, etc. [0003] Through ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C23C10/52F16K27/00
CPCC23C10/52C23C24/106F16K27/00
Inventor 霍会宾苏成明
Owner SHAANXI TIANYUAN MATERIALS PROTECTION TECH
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