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Preparation method of zinc-sprayed coating for long-acting corrosion prevention of nuclear waste storage barrel

A long-term anti-corrosion and nuclear waste technology, applied in metal material coating process, coating, fusion spraying, etc., can solve the problems of slow moving speed of spray gun, fast moving speed of spray gun, low spraying efficiency, etc., and achieve anti-stripping performance Good, good reproducibility, good binding effect

Inactive Publication Date: 2012-04-18
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the spraying speed is slow and the spray gun moves fast; the spraying efficiency is low and the spray gun moves slowly

Method used

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  • Preparation method of zinc-sprayed coating for long-acting corrosion prevention of nuclear waste storage barrel
  • Preparation method of zinc-sprayed coating for long-acting corrosion prevention of nuclear waste storage barrel
  • Preparation method of zinc-sprayed coating for long-acting corrosion prevention of nuclear waste storage barrel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Q235 steel plate is used as the base material, and zinc wire with a purity greater than 99.99% is used as the spraying material. Before spraying, copper ore is used to pre-treat the surface of the substrate to fully remove dirt, oil stains and roughen the surface. In order to increase the bonding strength of the coating, arc spraying is then carried out.

[0022] Arc spraying process parameters:

[0023]

[0024] The wire feeding speed is 2 m / min, that is, the beating wheel is 20 rpm.

[0025] The bond between the coating and the substrate material is as figure 1 shown; peel resistance as figure 2 Shown; Corrosion resistance adopts artificial seawater immersion accelerated corrosion test, soaked at room temperature for 720 hours, the measured corrosion rate is 0.0176g / m 2 h.

Embodiment 2

[0027] A3 steel plate is used as the base material, and zinc wire with a purity greater than 99.99% is used as the spraying material. Before spraying, copper ore is used to pre-treat the surface of the substrate to fully remove dirt, oil stains and roughen the surface. In order to increase the bonding strength of the coating, arc spraying is then carried out.

[0028] Arc spraying process parameters:

[0029]

[0030] The wire feeding speed is 2 m / min, that is, the beating wheel is 20 rpm

[0031] The bond between the coating and the substrate material is as image 3 shown; peel resistance as Figure 4 Shown; Corrosion resistance adopts artificial seawater immersion accelerated corrosion test, soaked at room temperature for 720 hours, the measured corrosion rate is 0.0233g / m 2 h.

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Abstract

The invention discloses a process for preparing a zinc-sprayed coating for long-acting corrosion prevention of a nuclear waste storage barrel. The process comprises the step of substrate surface pretreatment, namely removing dirt and oil stain as well as roughening surface, and adjusting and controlling the arc spraying process parameters, such as voltage, current, air pressure, spraying distance, workpiece rotation rate and the like. The process disclosed by the invention has the following technical effects that: 1. the obtained coating has good binding force with a steel substrate and can carry out long-acting and durable protection on the substrate; 2. the coating has an excellent anti-stripping performance; and 3. the process is simple and convenient, has good repeatability and is convenient for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a preparation process of a long-acting anti-corrosion zinc spray coating for nuclear waste storage barrels. Background technique [0002] Some nuclear power plants are built along the coast, and the atmosphere contains a high concentration of chloride ions, which greatly accelerates the corrosion of nuclear waste storage barrels. The corrosion of metal materials has brought huge losses to the national economy. A considerable amount of steel equipment is scrapped due to corrosion every year in the world. 30% of steel production. The deposition of chloride and sulfur dioxide in the atmosphere accelerates the corrosion of steel, so the corrosion protection of steel is particularly important. Zinc is often used as a sacrificial anode coating to protect steel due to its moderate chemical activity and low price. [0003] Thermal spraying technology is a ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/08C23C4/131
Inventor 刘继华钱士强陈国清
Owner SHANGHAI UNIV OF ENG SCI
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