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Spraying process of water erosion resisting coating for water turbine vanes

A blade and maneuvering technology, applied in the field of spraying process of blade anti-corrosion coating, can solve problems such as poor effect and complicated process, and achieve the effect of reducing production cost and high bonding strength

Inactive Publication Date: 2003-05-14
MUDANJIANG AIDI ELECTRICAL POWER TECHN
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

In order to solve this problem, the steam turbine factories mostly adopt the method of electric spark strengthening and welding stelling alloy sheet to prevent corrosion, which makes the process complicated and the effect is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] Process steps:

[0023] A. Repair welding: first repair the blade with severe water erosion on the inlet and outlet sides of the blade to repair the blade profile;

[0024] B. Sand blasting: hoist the rotor to the zero-meter platform, place it horizontally on the bracket, and protect the journal with a soft cloth, then put about 60 mesh emery into the container, and turn on the air compressor (rated pressure is 0.6mpa ), use the sandblasting gun to sweep the corundum on the edge of the water-eroded blade to remove the water-eroded part, and at the same time, the sandblasting also "activates" the surface of the blade into a frosted surface;

[0025] C. Blade protection:

[0026] Before the blade is sprayed with coating, it can be protected by applying anti-smearing glycerin on the surface of the non-sprayed part, so as not to change the original surface due to the sprayed coating;

[0027] D. Spray the transition layer: According to the blades of different materials, c...

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Abstract

The spraying process of water erosion resisting coating for water turbine vanes includes repair welding, sand blasting, spraying transition layer, applying pore sealing agent and vane protecting steps. It has high binding strength between the coating and vane surface resulting in coating life as long as four years and without peeling, leads to low use cost and is suitable for vanes operating in wet steam area and last stage vanes operating in low load condition.

Description

Technical field: [0001] The invention relates to a multi-stage blade device of a steam turbine or a nuclear power unit, in particular to a spraying process of a blade anti-corrosion coating. Background technique: [0002] The last stage of the steam turbine and the multistage blades of the nuclear power unit all work in the wet steam area. When the wet steam flows to the stationary blades, a small part of water droplets accumulate on the surface of the blades due to the inertial force, especially in the The inner arc of the leading edge of the vane. The water droplets accumulated on the surface of the stationary blade will form a water film, which will continue to flow from the surface of the blade to the steam outlet edge, forming large water droplets with a thickness equivalent to the steam outlet edge. Accelerating to different speeds impacts the moving blades, causing water erosion on the steam inlet side of the moving blades. [0003] At present, turbogenerators often...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/02C23C4/06C23C4/131
Inventor 范文献
Owner MUDANJIANG AIDI ELECTRICAL POWER TECHN
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