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Chromizing agent and technology of chromizing coating of chromizing agent

A chromizing and coating technology, which is applied in the field of new chromizing agent and chromizing coating technology, can solve the problems of difficult cleaning, unfavorable crushing, refinement and reuse, so as to improve production efficiency and avoid solidification of chromizing agent knot effect

Active Publication Date: 2018-04-06
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at a high temperature above 900°C, a series of physical and chemical reactions occur in the chromium powder (or ferrochromium), the activator and the workpiece material in the formula. At the same time, the infiltrating agent is easy to absorb water vapor in the air after cooling, and the infiltrating agent is consolidated. Attached to the surface of the workpiece, especially inside the slender tubular parts, it is difficult to clean, and it is not conducive to crushing and refining for reuse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) calcining alumina at 350°C for 3 hours;

[0020] (2) Take by weight percentage 30% of chromium powder, 2% of activator ammonium chloride, 50% of inert filler aluminum oxide, 18% of magnesium oxide) each component powder, stir and mix it, make powder particle size be 150-250 mesh, weigh serpentine asbestos accounting for 14.3% of the total volume of the aforementioned mixture, add it to the mixture, and mix again;

[0021] (3) Fill the above-mentioned chromizing agent into the inner cavity of the steel pipe, seal and weld both ends with end caps with small holes of 5 mm in diameter, carry out embedding and co-infiltration treatment at a temperature of 1050 ° C, and take it out after cooling with the furnace;

[0022] (4) Clean up the infiltrating agent, do sealing and moisture-proof treatment, and use the infiltrating agent as the ingredient of the infiltrating agent for the next chromizing, recycle, seal and store in a dry place.

Embodiment 2

[0024] (1) calcining alumina at 350°C for 3 hours;

[0025] (2) Take by weight percent each component powder of ferrochrome 50% containing chromium 50%, activator sodium chloride 2%, inert filler alumina 48%), stir and mix it evenly, make the powder particle size be 150-250 mesh, weigh expanded perlite accounting for 5% of the total volume of the aforementioned mixture, add it to the mixture, and mix evenly again;

[0026] (3) Fill the above-mentioned chromizing agent into the inner cavity of the steel pipe, seal and weld both ends with end caps with small holes of 5 mm in diameter, carry out embedding and co-infiltration treatment at a temperature of 1050 ° C, and take it out after cooling with the furnace;

[0027] (4) Clean up the infiltrating agent, do sealing and moisture-proof treatment, and use the infiltrating agent as the ingredient of the infiltrating agent for the next chromizing, recycle, seal and store in a dry place.

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PUM

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Abstract

The invention discloses a chromizing agent and a technology of a chromizing coating of the chromizing agent, and belongs to the field of metallic coatings. The chromizing agent comprises a chromium supply agent, an activating agent and an inert filler, and further comprises a foamed inorganic material, wherein the chromium supply agent is chromium powder and / or ferrochromium; the activating agentis ammonium chloride and / or sodium fluoride, the inert filler is aluminum oxide and / or magnesium oxide and the foamed inorganic material is foamed asbestos and / or expanded perlite. By taking corresponding measures like adding the high temperature resistant foamed inorganic material or the high temperature calcination inert filler to an existing chromizing agent, the defects that the chromizing agent in a traditional technology is solidified, the production efficiency is low, the chromizing agent is difficult to clean and the like are overcome.

Description

technical field [0001] The invention belongs to the field of metal coating, in particular, the invention discloses a new chromizing agent and a chromizing coating process thereof. Background technique [0002] Chromizing (Cr) on the metal surface is a chemical heat treatment method that infiltrates chromium into the surface of the workpiece through heating and diffusion to form a non-porous chromium alloy layer. The chrome layer has many advantages: it is thicker than the general electroplating layer, non-porous, firmly combined with the machine body, smoother and denser than the thermal spray layer, and more importantly, it can obtain a uniform infiltration layer on workpieces with complex shapes. High corrosion resistance, oxidation resistance and inertness. Therefore, the chromizing process is widely used in industry. [0003] Due to its simple process and low cost, powder embedded chromizing is one of the industrial production chromizing processes commonly used in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/38
CPCC23C10/38
Inventor 史永红刘京雷徐宏许岩峰
Owner SINOPEC YANGZI PETROCHEM
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