A method for anti-corrosion inside and outside of a dry-type gas tank

A technology for gas cabinets and cabinets, which is applied to anti-corrosion coatings, devices for coating liquid on the surface, coatings, etc., and can solve problems such as accelerated corrosion of the inner wall and bottom plate of the gas cabinet, inability to exert anti-corrosion effects, light and thermal instability, etc. , achieving important economic and social benefits, improving primer adhesion, and low life cycle cost

Active Publication Date: 2016-06-01
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although chlorinated rubber coatings have high chemical stability and good permeability resistance, as a halogen-containing resin, it is unstable to light and heat, and its service temperature is lower than 60 ° C. It cannot play a very good role in harsh environments such as coastal areas. Good anti-corrosion effect, and based on the concept of environmental protection, it is gradually restricted as an anti-corrosion finish
The epoxy coal tar pitch coating has poor corrosion resistance, and usually local coating peeling occurs within two years, while the epoxy zinc-rich primer has poor acid resistance. After the topcoat is damaged, the primer is quickly destroyed, and then Accelerated the corrosion of the inner wall and bottom plate of the gas cabinet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]The internal and external steel structure of the rubber model dry gas cabinet adopts the method of sandblasting to remove rust products on the surface. The surface cleanliness of the treated steel structure is Sa2.5, and the surface roughness is Rz25~100μm. The outer surface of the cabinet is coated with polyurethane modified epoxy zinc-rich primer coating, in which the polyurethane content is 9wt%, the zinc powder content is 80wt%, and the dry film thickness of the coating is 60 μm; after the primer coating is applied, it is naturally dried at room temperature After 24 hours, apply the epoxy mica iron intermediate paint coating, and the dry film thickness of the coating is 80 μm; after the intermediate paint coating is naturally dried at room temperature for 24 hours and the paint film is completely dry, the surface of the intermediate paint coating is cleaned and removed. Surface dirt and dust, coated with nano-titanium dioxide composite epoxy polyurethane, the dry film...

Embodiment 2

[0040] The internal and external steel structure of the rubber model dry gas cabinet adopts the method of sandblasting to remove rust products on the surface. The surface cleanliness of the treated steel structure is Sa2.5, and the surface roughness is Rz25~100μm. The outer surface of the cabinet is coated with polyurethane modified epoxy zinc-rich primer coating, in which the polyurethane content is 9wt%, the zinc powder content is 85wt%, and the dry film thickness of the coating is 100 μm; after the primer coating is applied, it is naturally dried at room temperature After 24 hours, apply an epoxy mica iron intermediate paint coating, wherein the mica iron oxide content is 20%, and the dry film thickness of the coating is 100 μm; after the intermediate paint coating is naturally dried at room temperature for 24 hours and the paint film is dry, the The surface of the intermediate paint coating is cleaned to remove surface dirt and dust, and then coated with nano-titanium dioxi...

Embodiment 3

[0042] The internal and external steel structure of the rubber model dry gas cabinet adopts the method of sandblasting to remove rust products on the surface. The surface cleanliness of the treated steel structure is Sa2.5, and the surface roughness is Rz25~100μm. The outer surface of the cabinet is coated with polyurethane modified epoxy zinc-rich primer coating, in which the polyurethane content is 9wt%, the zinc powder content is 80wt%, and the dry film thickness of the coating is 60 μm; after the primer coating is applied, it is naturally dried at room temperature After 24 hours, apply an epoxy mica iron intermediate paint coating, wherein the mica iron oxide content is 25%, and the dry film thickness of the coating is 80 μm; after the intermediate paint coating is naturally dried at room temperature for 24 hours and the paint film is dry, the Clean the surface of the intermediate paint coating to remove surface dirt and dust, and apply silicone-modified acrylic polyurethan...

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Abstract

The invention discloses a cabinet body internal and external corrosion-prevention method used for a converter coal gas cabinet. An epoxy type primer coat, an epoxy micaceous iron intermediate paint coat, and a modified polyurethane type topcoat are sequentially coated from inside to surface on the external surface of the cabinet body. Organosilicon-modified phenolic epoxy primer and topcoat are coated in the cabinet on a part contacting coal gas. Epoxy polyurethane type primer and topcoat are coated in the cabinet on a part which does not contact coal gas. The coat system provided by the invention has excellent weatherability under harsh marine climate or inland climate and industrial environments. The coat system inside the gas cabinet has excellent corrosion resistance, high-temperature resistance, and acidity resistance. With one coating process, the coat is relatively thick. The coat has long anti-corrosion service life, and short service life cycle cost. The coat satisfies environment-protection standards. With the method, the duration of the anti-corrosion property of a rubber-film-type dry converter coal gas cabinet can be guaranteed to reach 8-15 years.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion paint construction, and in particular relates to an anti-corrosion method inside and outside the cabinet used for converter gas cabinets. Background technique [0002] With the increasingly standardized development of gas recovery in iron and steel enterprises, rubber membrane dry gas holders are widely used in the metallurgical industry due to their simple structure, convenient operation, mature application, safety and reliability, and low construction and maintenance costs, and their market potential is huge. At present, it is widely used in China for storage of converter gas and system pressure stabilization. However, with the wide application of this gas holder, some disadvantages in operation gradually appear. There are many corrosion problems inside and outside the gas cabinet. Since most of the steel mills are located in coastal areas, the harsh marine climate and high dust, high hum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/10C09D5/08C09D163/00C09D175/04B05D1/36B05D3/12
Inventor 李闽黄永红邵远敬邵同平
Owner WISDRI ENG & RES INC LTD
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