Nickel base alloy powder, corresponding corrosion-resisting coating and preparing method thereof

A technology of corrosion-resistant coatings and nickel-based alloys, applied in metal material coating processes, coatings, etc., can solve problems such as inability to meet high-temperature concentrated sulfuric acid corrosion and process requirements, and reduce equipment manufacturing costs. promising effect

Active Publication Date: 2019-07-09
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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Problems solved by technology

[0007] Although the alloy powders for laser cladding given by the above technical scheme can achieve certain technical effects in the preparation / repair of specific equipment parts, they cannot meet and be suitable for other specific substrate laser cladding due to their own process characteristics. The process requirements of cladding, especially the requirements of corrosion resistance of high temperature concentrated sulfuric acid cannot be met

Method used

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  • Nickel base alloy powder, corresponding corrosion-resisting coating and preparing method thereof
  • Nickel base alloy powder, corresponding corrosion-resisting coating and preparing method thereof
  • Nickel base alloy powder, corresponding corrosion-resisting coating and preparing method thereof

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Embodiment 1

[0032] The substrate material selected for laser cladding in this embodiment is 304 stainless steel. The chemical composition of nickel-based alloy powder for laser cladding is: Cr: 30.00%; Fe: 17%; Mo: 3.50%; Si: 3.00%; Mn: 3.00%; Cu: 3.00%; Ti: 3.00%; B : 0.5%; Ni: balance. The surface of the stainless steel is polished with sandpaper, the surface roughness is Ra=0.2μm, and it is cleaned with acetone before cladding. Using semiconductor lasers, the selected laser cladding process parameters are: power: 800~3000W, focal length: 320~400mm, spot size: 2×4mm, scanning speed: 1mm / s~3mm / s, powder placement thickness: 1.0~ 2.0mm.

[0033] After laser cladding, such as figure 1 As shown, the surface of the cladding layer is flat, without macroscopic defects such as pores and cracks, and the hardness is HRC63. The microscopic appearance of the cladding layer is as figure 2 As shown in the figure, it can be seen that the cladding layer is well bonded to the substrate, and the clad...

Embodiment 2

[0040] The substrate used in this embodiment is a ball valve made of 304 stainless steel. The chemical composition of the alloy powder is: Cr: 30.00%; Fe: 17%; Mo: 3.50%; Si: 3.00%; Mn: 3.00%; Cu: 3.00%; Ti%: 3.00%; B: 0.5%; Ni: margin. The surface of the sphere is polished with sandpaper, and the surface roughness is Ra=0.2 μm, and it is cleaned with acetone before cladding. Using semiconductor lasers, the selected laser cladding process parameters are: power: 800~3000W, focal length: 320~400mm, spot size: 2×4mm, scanning speed: 1mm / s~3mm / s, powder thickness: 0.5~ 1.5mm. After laser cladding, the surface is turned, and the samples after cladding are as follows: Figure 5 As shown, the surface of the cladding layer is smooth and dense, without macroscopic defects such as pores and cracks.

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Abstract

The invention discloses nickel base alloy powder, a corresponding corrosion-resisting coating and a preparing method of the nickel base alloy powder and belongs to the technical field of surface engineering. The nickel base alloy powder comprises, by mass percent, 30.00%-35.00% of Cr, 15%-18% of Fe, 3.50%-4.00% of Mo, 1.50%-3.50% of Si, 1.50%-3.50% of Mn, 1.50%-3.50% of Cu, 1.00%-5.00% of Ti, 0.5%-2.0% of B, smaller than or equal to 0.03% of S, smaller than or equal to 0.04% of P, smaller than or equal to 0.04% of C and the balance Ni. By means of the nickel base alloy powder, after fusion covering of the nickel base alloy powder is conducted on a stainless steel and low carbon steel base body, the surface of a fusion covering layer is compact, the microscopic appearance is good, defects of air holes, cracks and the like do not exist, hardness is high, the corrosion resisting performance is good, existing high-temperature-resisting concentrated sulfuric acid alloy steel can be replaced, sulfuric acid manufacturing process equipment cost is effectively reduced, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and relates to a nickel-based alloy powder material suitable for laser cladding, in particular to a nickel-based alloy powder for laser cladding with high-temperature concentrated sulfuric acid corrosion resistance, and a corresponding corrosion-resistant coating and its preparation method. Background technique [0002] Sulfuric acid is a very important basic chemical raw material, which is widely used in chemical fertilizer industry, petroleum industry, non-ferrous smelting industry, chemical fiber industry, plastic industry, dye industry, etc. Therefore, it is no exaggeration to say that the annual output of sulfuric acid reflects the degree of development of a country's national economy and industry. The raw materials for sulfuric acid production mainly include pyrite, sulfur, smelting flue gas, sulfate, etc. Regardless of the raw materials, the process used in the sulfuric acid p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/02B22F9/08B22F1/00C23C24/10
CPCB22F1/0003B22F9/082C22C19/053C22C30/02C23C24/103
Inventor 于月光李正秋杜开平高向宙马尧
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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