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Surface modification zinc-aluminum rare earth joint-seeping method of steel heat exchanger tube bunch and seeping agent thereof

A technology of surface modification and heat exchanger, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve problems such as corrosion and perforation of heat exchange tube bundles, reduce production costs, improve adhesion, and resist Effect of improving high temperature corrosion performance

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a zinc-aluminum-rare-earth co-infiltration method for surface modification of steel heat exchanger tube bundles and its infiltration agent, which overcomes the above-mentioned deficiencies in the prior art and can effectively solve the problem of corrosion and perforation of heat exchange tube bundles in heat exchangers

Method used

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  • Surface modification zinc-aluminum rare earth joint-seeping method of steel heat exchanger tube bunch and seeping agent thereof
  • Surface modification zinc-aluminum rare earth joint-seeping method of steel heat exchanger tube bunch and seeping agent thereof
  • Surface modification zinc-aluminum rare earth joint-seeping method of steel heat exchanger tube bunch and seeping agent thereof

Examples

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Embodiment 1

[0027] Example 1, the zinc-aluminum-rare-earth co-infiltration method for the surface modification of the steel heat exchanger tube bundle is carried out according to the following steps: the first step, the steel heat exchanger tube bundle is subjected to surface pretreatment; the second step, the treated first step The steel heat exchanger tube bundles are embedded in the infiltrating agent; the third step is to heat the infiltrating agent so that the infiltrating agent is co-infiltrated with Zn-Al-REE at a temperature of 480°C to 580°C, and the co-infiltrate time is not less than 12 hours to form Zinc-aluminum rare earth co-infiltration layer; wherein: the infiltration agent is composed of 40-45 parts of zinc powder, 40-50 parts of zinc-aluminum-cerium alloy powder, 8-12 parts of alumina powder, and 2-4 parts of ammonium chloride by weight. 3 copies.

Embodiment 2

[0028] Example 2, the zinc-aluminum rare earth co-infiltration method for the surface modification of the steel heat exchanger tube bundle is carried out according to the following steps: the first step, the steel heat exchanger tube bundle is subjected to surface pretreatment; The steel heat exchanger tube bundles are embedded in the infiltrating agent; the third step is to heat the infiltrating agent so that the infiltrating agent is co-infiltrated with Zn-Al-REE at a temperature of 480°C or 580°C, and the co-infiltrate time is not less than 12 hours to form Zinc-aluminum rare-earth co-infiltration layer; wherein: the infiltration agent consists of 40 or 45 parts of zinc powder, 40 or 50 parts of zinc-aluminum-cerium alloy powder, 8 or 12 parts of alumina powder, and 2 or 2 parts of ammonium chloride by weight. 3 copies.

Embodiment 3

[0029] Embodiment 3, the difference with embodiment 1 and embodiment 2 is: in embodiment 3, zinc powder is 100 order to 150 order zinc powder or / and zinc-aluminum-cerium alloy powder is 150 order zinc-aluminum-cerium alloy powder or / And alumina powder is 100 mesh to 150 mesh alumina powder.

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Abstract

The invention relates to the technical field of chemical treatment of metal and provides a surface modification zinc-aluminum rare earth joint-seeping method of a steel heat exchanger tube bunch and a seeping agent of the surface modification zinc-aluminum rare earth joint-seeping method. The surface modification zinc-aluminum rare earth joint-seeping method of the steel heat exchanger tube bunch comprises the following steps of: conducting surface pretreatment on the steel heat exchanger tube bunch; and embedding the steel heat exchanger tube bunch processed in the first step in the seeping agent. The steel heat exchanger tube bunch is embedded in the seeping agent, so that base metallic iron obtains a zinc-aluminum rare earth joint-seeping layer with a double-layer structure of rich aluminum on the outer layer and rich zinc on the inner layer, corrosion resistance is obviously improved, adhesive force of the seeping layer is further improved by adding rare-earth elements in the seeping agent, high-temperature corrosion resistance of materials is substantially improved, the cost of the seeping agent is 15% to 30% lower than that for alumetizing and chemical plating, the corrosion problem limiting production run is solved, the obvious antiseptic run effect is achieved, the production cost is reduced, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of metal chemical heat treatment, and relates to a zinc-aluminum-rare-earth co-infiltration method and an infiltration agent for surface modification of steel heat exchanger tube bundles. Background technique [0002] At present, the heat exchange tube bundle of the condensate oil stabilization heat exchanger in the Dalaoba gas gathering and treatment station is made of 20# carbon steel, and the design operating temperature is 195°C. Due to the high salt content (143.95 mg / L ) and high wax content ( 14.68%), high acid value (0.0758mgKOH / g); formation water with high chloride ion (152823.61mg / L), high salinity (247536.91mg / L), low ph value (<6), resulting in corrosion and perforation of the tube bundle , during the 4 years of production and operation, 5 tube bundles were perforated and scrapped successively, and the corrosion rate was 3.14 mm / a. Heat exchangers are the main process equipment in petroleum,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/52
Inventor 文军红羊东明吐依洪江代维贾雷梁根生姚金花陈玉
Owner CHINA PETROLEUM & CHEM CORP