Erosion and corrosion-resistant coating system and process therefor

An anti-corrosion and cladding technology, which is applied in the direction of metal material coating process, superimposed layer plating, coating, etc., can solve the problems that may not necessarily show resistance to water drop erosion, and achieve enhanced anti-corrosion pitting and anti-crack Corrosivity, reducing any loss, reducing effect of pitting corrosion

Inactive Publication Date: 2009-07-15
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although blades made of nickel and titanium alloys can exhibit improved corrosion resistance, they do not necessarily exhibit improved water drop erosion resistance

Method used

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  • Erosion and corrosion-resistant coating system and process therefor

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Embodiment Construction

[0012] The present invention provides an erosion and corrosion resistant coating system that is particularly suitable for protecting components formed from iron-based alloys, particularly industrial gas turbine compressor blades formed from martensitic stainless steel and subject to water droplet attack and corrosion pitting. Notable examples include first-stage compressor blades formed from 400 series martensitic stainless steels such as AISI 403 and proprietary formulations such as GTD-450 precipitation hardening martensitic stainless steels. Although the invention will be described with reference to compressor blades formed from stainless steel, it should be understood that the teachings of the invention would apply to other components formed from various iron-based alloys and would benefit from protection against water droplet erosion and corrosion pitting. Improved resistance.

[0013] figure 1 The cladding system 10 of the present invention is schematically represented ...

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Abstract

The present invention relates to a erosion and corrosion-resistance coating system and process thereof. A coating system and process capable of providing erosion and corrosion-resistance to a component, particularly a steel compressor blade of an industrial gas turbine. The coating system includes a metallic sacrificial undercoat on a surface of the component substrate, and a ceramic topcoat deposited by thermal spray on the undercoat. The undercoat contains a metal or metal alloy that is more active in the galvanic series than iron, and electrically contacts the surface of the substrate. The ceramic topcoat consists essentially of a ceramic material chosen from the group consisting of mixtures of alumina and titania, mixtures of chromia and silica, mixtures of chromia and titania, mixtures of chromia, silica, and titania, and mixtures of zirconia, titania, and yttria.

Description

technical field [0001] The present invention generally relates to protective coatings and coating processes for turbomachine components. More particularly, the present invention relates to a cladding system for steel compressor blades for gas turbines to improve the blade's resistance to water droplet erosion and corrosion. Background technique [0002] In-line water washing, misting, and evaporative cooler systems have been used to improve compressor performance in large industrial gas turbines, such as those used in facilities for generating electricity. These systems typically entail the introduction of water droplets at the compressor inlet, causing the blades of the compressor's first stage to be impacted by water droplets falling at high velocity. Compressor blades made of iron-based alloys, including 400 series stainless steel, are susceptible to erosion by water droplets at their leading edges, including their roots where the blade airfoil is attached to the blade p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23F13/00C23C4/10B32B15/04B32B18/00F01D5/28
CPCC23C28/345C23C28/00C23C28/322F05B2260/95F01D5/288F05C2203/08C23C4/18C23C28/3455C23C28/3225C23C28/347C23C28/321C23C4/02F05D2300/21C23C30/00C23C4/105F05D2260/95C23C4/11Y10T428/31678
Inventor S·S·帕布拉J·C·谢菲尔V·K·帕里克D·V·布奇T·穆尔斯J·M·利普金
Owner GENERAL ELECTRIC CO
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