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Corrosion protection method for movable guide vane of seawater pump turbine

A technology of water pump turbine and movable guide vane, which is applied in metal material coating process, melt spraying, coating and other directions, can solve the problems of galvanic corrosion, crevice corrosion, short service time of movable guide vane, etc., and achieve high wear resistance. The effect of damage and erosion resistance, good shielding effect, uniform and dense organization

Active Publication Date: 2021-06-25
哈动国家水力发电设备工程技术研究中心有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that crevice corrosion and galvanic corrosion are prone to occur between the lower shoulder of the movable guide vane and the seat ring, the upper shoulder and the top cover in the traditional anti-corrosion method, and the service time of the movable guide vane is short , and provide a corrosion protection method for movable guide vanes of seawater pump turbines

Method used

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  • Corrosion protection method for movable guide vane of seawater pump turbine
  • Corrosion protection method for movable guide vane of seawater pump turbine
  • Corrosion protection method for movable guide vane of seawater pump turbine

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specific Embodiment approach 1

[0015] Specific implementation mode 1: In this implementation mode, a corrosion protection method for movable guide vanes of seawater pump turbines is completed according to the following steps:

[0016] 1. Clean the surfaces of the upper shoulder 1 and the lower shoulder 3 of the movable guide vane: polish the surfaces of the upper shoulder 1 and the lower shoulder 3 of the movable guide vane, then use an organic solvent to clean and dry to obtain the The treated active guide vane;

[0017] 2. Arc spraying of upper shoulder 1 and supersonic flame spraying of lower shoulder 3: Spray the surface of upper shoulder 1 of the pretreated movable guide vane with arc spraying equipment to form NiCr coating 2 and NiCr coating 2 The thickness is less than the distance between the upper shoulder 1 and the top cover 5; the surface of the lower shoulder 3 is sprayed with supersonic flame spraying equipment to form Cr 2 C 3 -25% NiCr coating 4, Cr 2 C 3 The thickness of the -25% NiCr co...

specific Embodiment approach 2

[0021] Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 1, the surface roughness of the upper shoulder of the movable guide vane is polished to 3.2-6.3.

[0022] Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0023] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in Step 1, the surface roughness of the lower shoulder of the movable guide vane is polished to 1.6-3.2.

[0024] Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a corrosion protection method for a movable guide vane of a seawater pump turbine, and relates to the technical field of movable guide vane corrosion protection. The method aims at solving the problems that crevice corrosion and galvanic corrosion are prone to occurring between a lower shaft shoulder and a seat ring and between an upper shaft shoulder and a top cover of the movable guide vane in a traditional anti-corrosion method, and the service time of the movable guide vane is short. The method comprises the following steps of grinding the surfaces of the upper shaft shoulder and the lower shaft shoulder of the movable guide vane, cleaning by using an organic solvent, and conducting blow-drying; spraying the pretreated surface of the upper shaft shoulder of the movable guide vane through electric arc spraying equipment to form a NiCr coating, wherein the thickness of the NiCr coating is smaller than the distance between the upper shaft shoulder and the top cover; and spraying the surface of the lower shaft shoulder through supersonic flame spraying equipment to form a Cr2C3-25% NiCr coating so as to complete corrosion protection of the movable guide vane of the seawater pump turbine. The corrosion protection method for the movable guide vane of the seawater pump turbine can be obtained.

Description

technical field [0001] The invention relates to the technical field of corrosion protection of movable guide vanes, in particular to a corrosion protection method for movable guide vanes of seawater pump turbines. Background technique [0002] The movable guide vane of the sea water pump turbine has been serving in seawater or in the air filled with salt spray for a long time. The upper and lower journals of the movable guide vane are provided with two water sealing seals, and the journal and the self-lubricating bearing bush are relatively rotated. There is a small gap between the top cover and the bottom ring, and the shaft shoulder is prone to crevice corrosion and galvanic corrosion. Therefore, the strong corrosiveness of seawater makes the corrosion protection of movable guide vanes a key factor for the safe and stable operation of the unit. In the strongly corrosive environment of seawater, the traditional method of oiling the shaft shoulders cannot meet the corrosion...

Claims

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Application Information

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IPC IPC(8): C23C4/131C23C4/134C23C4/08C23C4/06C23C4/02
CPCC23C4/131C23C4/134C23C4/08C23C4/06C23C4/02Y02E10/20
Inventor 李定林贾朋刚霍岩李景文道维侯世璞刘毅彭鹏刘玉鑫葛光男程广福
Owner 哈动国家水力发电设备工程技术研究中心有限公司
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