Corrosion-resistant and alkali-resistant treatment method for pipe piece connecting piece of metro

A connecting piece and corrosion-resistant technology, which is applied in the fields of multi-component metal co-infiltration and alkali-resistant treatment, can solve the problems of corrosion, high energy consumption of composite heat treatment technology, and thin coating, so as to improve economy and reduce the frequency of maintenance and replacement Effect

Inactive Publication Date: 2012-04-11
SHANGHAI DACROMET SURFACE TREATMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is that after the subway is completed and put into operation, when the subway train passes through the tunnel, electric stray currents will be generated in the tunnel, which will cause a greater safety hazard to the formation of the train. Therefore, the segment bolts must conduct electricity and pass through the safety structure in time conduct out
Thermal spraying zinc (or aluminum, or zinc-aluminum alloy) has an insurmountable porosity problem. Although it can be controlled at about 1% at present, it cannot be solved fundamentally. Once there are defects in sealing, water, oxygen and salts are very difficult. It is easy to enter the body through pores and corrode
Dacromet technology has strong corrosion resistance and good resistance to neutral salt spray, but the coating is thin, the wear resistance is not good, and it is greatly affected by the construction environment
QPQ composite heat treatment technology has high energy consumption and unfavorable environmental protection factors, and the corrosion resistance life is only 2-3 years

Method used

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  • Corrosion-resistant and alkali-resistant treatment method for pipe piece connecting piece of metro
  • Corrosion-resistant and alkali-resistant treatment method for pipe piece connecting piece of metro
  • Corrosion-resistant and alkali-resistant treatment method for pipe piece connecting piece of metro

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Experimental program
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Effect test

Embodiment 1

[0034] Multi-element metal co-infiltration treatment of segmental joints, through zinc, aluminum and dilute elements at a temperature of 380-430 ° C, with the infiltration aid NH 4 Cl reacts chemically to form a variety of active metal atoms, which interpenetrate with the steel matrix to form a co-infiltration layer with a thickness of 40-50 μm. The co-infiltration layer consists of a small amount of δ phase in the transition layer, the zinc mass percentage of the transition layer is 25%, the middle layer is mainly composed of δ phase and a small amount of ferrite and pearlescent beads in the iron-based material. The mass percentage reaches 80%.

[0035] The outermost layer is dominated by duplex structure (Γ phase + α phase), and the mass percentage of zinc is more than 60%. After the above-mentioned multi-element metal co-infiltration, the joint resistance is 3mΩ, which is lower than the designed upper Limits (Table 1).

Embodiment 2

[0037] The alkali-resistant treatment of the segment connection is mainly to carry out the alkali-resistant treatment on the polished rod part and the middle thread of the bolt in the connection ( image 3 ). It is treated with SDF-202 alkali-resistant coating. Baking at 170-180°C for 15-20 minutes, the coating thickness is 10-12μm (see image 3 and instructions).

Embodiment 3

[0039] Both ends of bolts and nut gaskets are treated with JC-806 black alkali-resistant coating. Baking at 180-200°C for 15-20 minutes, the coating thickness is 10-12μm (see figure 1 , 2 and instructions). in particular figure 1 There is no alkali-resistant treatment in the ring-shaped area of ​​5mm outside the inner circle of the gasket.

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Abstract

The invention relates to a corrosion-resistant and alkali-resistant treatment method for a pipe piece connecting piece of a metro. The method is characterized by comprising the following steps of: performing multi-metal co-diffusion treatment on the pipe piece connecting piece to endow the pipe piece connecting piece with corrosion resistance and electrical conductivity; and performing different alkali-resistant treatment on special parts which may contact alkaline water after the pipe piece connecting piece is assembled, wherein the special parts comprise polished rod parts and middle threads of bolts in the pipe piece connecting piece, five thread parts and end faces at the two ends of each bolt, and exposed parts after nuts and gaskets are assembled. By the corrosion-resistant and alkali-resistant treatment method for the pipe piece connecting piece of the metro, the technical requirements of corrosion resistance, alkali resistance, electrical conductivity and the like of the pipe piece connecting piece of the metro are met, the maintenance and replacement frequency of components and parts in the running of the metro is greatly decreased at the same time, and the running economy of the metro is improved.

Description

technical field [0001] The invention relates to a corrosion-resistant and alkali-resistant method for segment connectors used in subways, and more precisely relates to a method for combining multi-element metal co-infiltration and alkali-resistant treatment for segment connectors used in subways. Background technique [0002] Urban rail transit is one of the important means to solve the traffic problems in our country's cities, especially large and extra-large cities. In recent years, the number of tunnel projects using the deep-buried shield method in rail transit projects has also increased, and higher requirements have been put forward for the anti-corrosion technology of subway segment connectors. [0003] Segment connectors of subway tunnels must meet the durability requirements of the 100-year design service life of subway tunnels. If the segment connectors of the subway tunnel are corroded, since the tunnel segment connectors cannot be replaced, the bearing capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/00B05D5/00
Inventor 黄华清王秀志刘朝明杨勇郑国强
Owner SHANGHAI DACROMET SURFACE TREATMENT
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