Method for thermally spraying monel metal coating on surface of stainless steel

A technology of alloy coating and stainless steel, applied in metal material coating technology, coating, fusion spraying, etc., can solve problems such as oxide inclusions, cost increase of submersible electric pumps, etc.

Inactive Publication Date: 2013-04-03
上海大豪纳米材料喷涂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of Monel alloy is close to 10 times that of stainless steel, which greatly increases the cost of submersible electric pumps.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1. The method of thermal spraying Monel alloy coating on the surface of stainless steel, the stainless steel is 1Cr18Ni9, and its composition is:

[0027] C≤0.12% Si≤1.0% Mn≤2.0%

[0028] S≤0.03% P≤0.035% Cr: 17.00~19.00%

[0029] Ni: 8.00~11.00% Fe: balance

[0030] The nickel-aluminum primer alloy is: Ni: 95% Al: 5%

[0031] Monel alloy is the standard Monel 400 alloy, and its chemical composition is as follows:

[0032] element content(%) nickel 63min copper 28min~34max iron 2.5max manganese 2.0max carbon 0.3max silicon 0.5max sulfur 0.024max

[0033] The present invention includes the following steps:

[0034] (1) Decontaminate the surface of the stainless steel substrate and wipe it with an organic solvent.

[0035] (2) Sandblasting and texturing the decontaminated stainless steel substrate. Use alumina corundum sand with a grain size of 0.5mm~1.5mm and a sandblasting air pressure of 0.6~0.7Mpa. After sandblasting, the roughness is controlled at 50~120um.

[...

Embodiment 2

[0042] Example 2. According to the parameters in Example 1, the thickness of Monel alloy coating was sprayed to 0.1mm, and the other parameters were the same as in Example 1.

Embodiment 3

[0043] Example 3. According to the parameters in Example 1, the Monel coating was not sealed at the end, and other parameters were the same as in Example 1.

[0044] After observing the metallographic sample, the metallographic image is calculated and analyzed by computer dyeing method, and the porosity is 3.5%, which is higher than the traditional arc thermal spraying process with a porosity of about 5%. Comparing two samples with different Monel alloy coating thickness in Example 1 and Example 2, it is found that the porosity of the coating is basically the same, but the pores and voids of the two coatings are essentially different. In Example 1, the pores in the 0.3mm coating thickness sample were evenly distributed throughout the coating, but the pores in the coating area on the outermost surface were not connected to the underlying stainless steel substrate. After analysis, it is believed that the Monel thermal spray coating is composed of semi-solidified metal particles tha...

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Abstract

The invention relates to a method for thermally spraying a monel metal coating on the surface of the stainless steel. The method comprises the following steps: decontaminating the surface of a stainless steel substrate, sand-blasting and roughing the decontaminated stainless steel substrate, thermally spraying a nickel-aluminum bond coating on the roughed surface, thermally spraying a monel metal work coating to cover the bond coating, and carrying out sealing treatment on the monel metal coating. By adopting the method provided by the invention, the test of metallurgical microscopy and microhardness proves that the monel metal coating prepared on the surface of the stainless steel can effectively reduce the pore and cavity of the coating, and can effectively seal the pore and cavity of the surface by using the hole-sealing filler. As the coating hardness is influenced by the characteristics of the thermal spraying, the coating has material oxide inclusion, and the coating hardness is improved by 1.426 times in comparison with that of the primary monel metal.

Description

technical field [0001] The invention relates to a method for thermally spraying Monel alloy coating on the surface of stainless steel. Background technique [0002] Thermal spraying technology is a fine and dispersed metal or non-metallic coating material, which is deposited on the surface of a prepared substrate in a molten or semi-molten state to form a certain spray deposition layer. It uses some kind of heat source (such as electric arc, plasma spraying or combustion flame, etc.) to heat powdery or filamentous metal or non-metallic materials to a molten or semi-molten state, and then sprays them at a certain speed by means of the flame itself or compressed air. The pretreated substrate surface is deposited to form a surface coating with various functions. [0003] Structural characteristics of thermal spray coating: The formation process of thermal spray coating determines the structural characteristics of the coating. The spray coating is a layered structure with count...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/08C23C4/18C23C4/02C23C4/06C23C4/131
Inventor 赵华明徐文华王耀昇张铭
Owner 上海大豪纳米材料喷涂有限公司
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