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Welding sealing method for preventing crevice corrosion from being generated between iron anode and copper alloy flange

A technology of welding sealing and crevice corrosion, which is applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of cumbersome installation, water seepage, crevice corrosion of iron anode 1 and copper alloy flange, and achieve the effect of solving crevice corrosion

Active Publication Date: 2016-06-29
SUNRUI MARINE ENVIRONMENT ENG
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Problems solved by technology

This sealing method is not only cumbersome to install, but also if the installation requirements cannot be met, water seepage will occur, causing crevice corrosion between the iron anode 1 and the copper alloy flange 3

Method used

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  • Welding sealing method for preventing crevice corrosion from being generated between iron anode and copper alloy flange
  • Welding sealing method for preventing crevice corrosion from being generated between iron anode and copper alloy flange
  • Welding sealing method for preventing crevice corrosion from being generated between iron anode and copper alloy flange

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Embodiment Construction

[0016] see Figure 2 ~ Figure 4 , The flanged iron anode of the present invention is assembled from a ring-shaped iron anode 1 and a copper (nickel) alloy flange 3 , and the iron anode 1 is embedded in the center hole of the copper alloy flange 3 . The iron anode 1 will preferentially dissolve in seawater, and play a role in protecting the copper pipeline of the ship connected with it. The present invention performs welding and sealing treatment on the contact ring surface (line) between the annular iron anode 1 and the copper alloy flange 3 . The weld 5 mainly plays the role of protection and sealing. Therefore, when selecting welding materials, materials with a natural potential in seawater close to the copper alloy flange should be selected as much as possible, so that the weld 3 will not be corroded by galvanic couples in seawater. Dissolves preferentially. In addition, since the physical properties of the iron anode 1 and the copper flange 3 are very different, defects ...

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Abstract

A welding sealing method for preventing crevice corrosion from being generated between an iron anode and a copper alloy flange comprises the annular iron anode and the copper alloy flange, the peripheral surface of the annular iron anode is embedded into a center hole of the copper alloy flange in a matched mode, and the two ends of the annular iron anode and the two ends of the copper alloy flange are flush with each other. The welding sealing method is characterized in that the contact interfaces of the two ends of the annular iron anode and the copper alloy flange are subjected to welding sealing. The welding sealing method has the advantages that the contact faces between the iron anode and the cooper alloy flange are sealed and protected in a welding mode, the phenomenon of water seepage through the contact faces is avoided, the problem of crevice corrosion is solved thoroughly, it is ensured that the iron anode can reach the required and designed service life, and the dissolving property of the iron anode in seawater and the protection function and effect of the iron anode to a seawater pipeline are not affected in the protection validity period.

Description

technical field [0001] The invention relates to a welding and sealing method for preventing crevice corrosion between an iron anode for cathodic protection of ship pipelines and a copper alloy flange, and belongs to the field of corrosion and protection of ship pipelines. Background technique [0002] Due to the various devices such as elbows, tees, and valves in the ship's seawater piping system, and the small diameter of various pipelines, high seawater flow velocity, and high degree of local turbulence, the pipeline is not only severely corroded and damaged, but also It is also very difficult to defend. At present, sacrificial anodes are mainly used to protect seawater pipelines. There are three kinds of sacrificial anode materials available: zinc alloy anode, aluminum alloy anode and iron alloy anode. When used to protect copper alloy seawater pipelines, iron alloy anodes are usually used, and flanged iron anodes have been widely used. [0003] Existing flanged iron an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K35/30B23K103/22
CPCB23K9/16B23K35/3033B23K2103/22
Inventor 王廷勇杜伟谌洪伟
Owner SUNRUI MARINE ENVIRONMENT ENG
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