Preparation method of stainless steel aluminum coating

A kind of stainless steel and aluminum coating technology, applied in coating, metal material coating process, solid diffusion coating and other directions, can solve the complex operation process of hot dip aluminum process, poor high temperature performance of products, low efficiency of aluminizing process, etc. problems, to achieve the effect of simple and feasible preparation method, low shape requirements, easy operation and control

Inactive Publication Date: 2018-10-09
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The actual technical problem to be solved by the present invention is to overcome the defects of the prior art, such as the complicated operation process of the hot-dip aluminum process, the poor high-temperature performance of the obtained product, the low efficiency of the powder embedding aluminizing process, and environmental pollution, etc., and provides A kind of preparation method of stainless steel aluminum coating

Method used

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  • Preparation method of stainless steel aluminum coating
  • Preparation method of stainless steel aluminum coating
  • Preparation method of stainless steel aluminum coating

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The molten salt system in this embodiment is the FLiNaK molten salt system.

[0033] ① Pretreatment of 316L stainless steel

[0034] Cut the 316L stainless steel into a sample with a size of 15mm×5mm×1mm by wire cutting method, and punch a hole with a diameter of φ2mm on the sample. The surface of all samples was polished step by step with SiC sandpaper to 2000 mesh, then ultrasonically cleaned with deionized water and absolute ethanol in sequence, and dried with a hair dryer and cold air.

[0035] ② 316L stainless steel aluminized in FLiNaK molten salt at 700 °C

[0036] Add the pretreated 316L stainless steel sample into a stainless steel crucible, weigh 200g of solid LiF-KF-NaF (46.5-11.5-42mol%, FLiNaK) salt, then add 5000ppm of aluminum powder (200 mesh, 4N )well mixed. Add the mixed salt into the crucible, put it into an atmosphere-protected muffle furnace, and keep it at a constant temperature of 700°C for 48h. In order to avoid impurities such as oxygen and ...

Embodiment 2

[0038] The molten salt system in this example is NaCl-KCl-MgCl 2 (33-21.6-45.4mol%) system.

[0039] ① Pretreatment of 316L stainless steel

[0040] Cut the 316L stainless steel into a sample with a size of 15mm×5mm×1mm by wire cutting method, and punch a hole with a diameter of φ2mm on the sample. The surface of all samples was polished step by step with SiC sandpaper to 2000 mesh, then ultrasonically cleaned with deionized water and absolute ethanol in sequence, and dried with a hair dryer and cold air.

[0041] ② 316L stainless steel is aluminized in chlorine salt at 700 °C

[0042] Add the pretreated 316L stainless steel sample into a stainless steel crucible, weigh 200g of solid NaCl-KCl-MgCl 2 (33-21.6-45.4mol%) salt, then add 2000ppm of aluminum powder (100 mesh particle size) to the chloride salt and mix well. Add the mixed salt into the crucible, put it into an atmosphere-protected muffle furnace, and keep it at a constant temperature of 700°C for 48h. In order t...

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Abstract

The invention discloses a preparation method of a stainless steel aluminum coating. The method comprises the step that pre-processed stainless steel reacts in a mixture of 'fluoride melting salt and / or molten chloride melt' and aluminum in an inert atmosphere; and the reaction temperature is 500-700 DEG C. The method is simple, feasible, safe, environmentally friendly, and easy to operate and control; the equipment manufacturing and processing costs are decreased; a stable metallurgic combination structure can be formed; the combination strength of an aluminum layer and a substrate is high; in addition, the coating structure is uniform, and the thickness is controllable; small requirements are provided to the product shape; complex parts can be processed; and industrial production can becarried out.

Description

technical field [0001] The invention relates to the field of material surface modification, in particular to a method for preparing a stainless steel aluminum coating. Background technique [0002] Aluminized steel parts have many excellent properties, including weather resistance, corrosion resistance, wear resistance, high temperature oxidation resistance, carburization resistance, light (heat) reflectivity and hydrogen / tritium resistance, etc. Therefore, it is widely used in various fields, such as petroleum, chemical industry, metallurgy, machinery, light industry, transportation, construction, electric power communication, aviation, solar energy, ocean engineering, nuclear energy, etc. [0003] The aluminizing technologies developed at home and abroad mainly include mechanical energy assisted aluminizing, slurry aluminizing, gas phase aluminizing, hot dip aluminizing, glow ion aluminizing, embedding aluminizing, molten salt aluminizing, thermal spray aluminizing, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/24
Inventor 刘崎俞国军刘华剑
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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