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Method of preventing sulfide corrosion, high-temperature member with resistance to sulfide corrosion, and method of repairing heat-transfer tube

An anti-vulcanization and heat-conducting tube technology, applied in chemical instruments and methods, liquid chemical plating, solid-state chemical plating, etc., can solve the problems of high coating cost and coating peeling.

Active Publication Date: 2010-01-27
CENTRAL RESEARCH INSTITUTE OF ELECTRIC POWER INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in order to improve the sulfidation corrosion resistance of such a coating composed of titanium oxide particles, the coating needs to be thickened, and there are problems that the coating is easily peeled off and the cost of coating formation becomes high.

Method used

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  • Method of preventing sulfide corrosion, high-temperature member with resistance to sulfide corrosion, and method of repairing heat-transfer tube
  • Method of preventing sulfide corrosion, high-temperature member with resistance to sulfide corrosion, and method of repairing heat-transfer tube
  • Method of preventing sulfide corrosion, high-temperature member with resistance to sulfide corrosion, and method of repairing heat-transfer tube

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

figure 1 It is a schematic diagram showing a sulfide corrosion-resistant high-temperature component according to the present embodiment. Such as figure 1 As shown, the sulfide corrosion-resistant high-temperature component 1 is a component in which a silicon oxide layer 20 and a first titanium oxide layer 30 are sequentially formed on the surface of a base material 10 .

[0053] The silicon oxide layer 20 is not particularly limited as long as it can be densely formed on the surface of the substrate 10 , and is preferably in an amorphous state. By making the silicon oxide layer 20 in an amorphous state, which will be described in detail later, it is possible to prevent cracks from occurring in the first titanium oxide layer 30 when forming the first titanium oxide layer 30, and to form a dense layer with very few cracks. uniform first titanium oxide layer 30.

[0054] As the silicon oxide constituting the silicon oxide layer 20, for example, SiO, SiO 2 or a mixture of them....

Embodiment approach 2

figure 2 It is a schematic diagram showing the sulfide corrosion-resistant high-temperature component of the present embodiment. The sulfidation corrosion resistant high temperature component 1A of the present embodiment is as figure 2 As shown, a carbon layer 40 and a second titanium oxide layer 50 are further provided on the first titanium oxide layer 30 . That is, the sulfide corrosion-resistant high-temperature component 1A of the present embodiment is composed of a silicon oxide layer 20, a first titanium oxide layer 30, a carbon layer 40, and a second titanium oxide layer 50 sequentially provided on the surface of a base material 10. A 5-layer structure is formed.

[0070] The carbon layer 40 is not particularly limited as long as it can be provided on the first titanium oxide layer 30 . In addition, the thickness of the carbon layer 40 is not particularly limited, but is preferably in the range of 10 to 30 μm. The carbon layer 40 having a thickness in this range ca...

Embodiment approach 3

In Embodiments 1 and 2, the silicon-containing coating liquid and the titanium-containing coating liquid were applied separately and thermally oxidized, but the present invention is not limited thereto, and thermal oxidation may be performed collectively.

[0078] For example, a silicon-containing coating liquid is coated on the substrate 10 and dried to form a silicon-containing coating layer (first coating step).

[0079] Next, a titanium-containing coating liquid is applied on the silicon-containing coating layer, and dried to form a first titanium-containing coating layer (second coating step).

[0080] Next, a carbon layer 40 is formed on the first titanium-containing coating layer (carbon layer forming step).

[0081] Next, a titanium-containing coating liquid is applied on the carbon layer 40 and dried to form a second titanium-containing coating layer (third coating step).

[0082] Finally, the silicon-containing coating layer, the first and second titanium-containing ...

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Abstract

A method of sulfide corrosion prevention by which a base is protected from sulfide corrosion; and a high-temperature member which has excellent resistance to sulfide corrosion. Also provided is a method of repairing a cracked heat-transfer tube which comprises: forming a silicon oxide layer on the surface of the base; applying a titanium-containing coating fluid containing titanium metal or a titanium compound to the silicon oxide layer and thermally oxidizing the coating to form a first titanium oxide layer; forming a carbon layer on the first titanium oxide layer; and applying a titanium-containing coating fluid to the carbon layer and thermally oxidizing the coating to form a second titanium oxide layer, whereby the base is protected or repaired with the silicon oxide layer, first titanium oxide layer, carbon layer, and second titanium oxide layer.

Description

technical field [0001] The present invention relates to a sulfidation corrosion prevention method for high-temperature parts such as hydrogen sulfide-induced corrosion and sulfide corrosion cracking, and a repair method for sulfide-resistant high-temperature parts and heat transfer pipes. Background technique [0002] Conventionally, in thermal power generation equipment and the like, corrosion of structural materials constituting these equipment has been a major problem due to gas generated during fuel combustion. [0003] That is, as an example of a structural material, the wall thickness of boiler water wall tubes (substrate: ferritic steel) and high temperature heat transfer tubes such as superheater tubes and reheater tubes of thermal power boilers, which are an example of structural materials, has a thickness greater than that specified in the design due to sulfidation corrosion. The problem of lower limit wall thickness. In addition, there is also a problem of occurr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/12B05D5/00C23C20/08C23C28/04
CPCC23C28/048C23C18/1208C23C28/042C23C18/127C23C18/1241C23C8/02C23C18/122C23C26/00C23C28/04C23C18/1225C23C18/1216B32B18/00Y10T428/30
Inventor 河瀬诚森永雅彦
Owner CENTRAL RESEARCH INSTITUTE OF ELECTRIC POWER INDUSTRY
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