A kind of cold-sprayed aluminum-based corrosion-resistant coating and preparation method thereof

A cold spraying and coating technology, applied in the field of metal surface treatment, to achieve the effects of good wear resistance, low porosity and good mechanical properties

Active Publication Date: 2018-05-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of cold-sprayed aluminum-based corrosion-resistant coating, which is modified by adding rare earth, magnesium and other trace alloy elements to the existing aluminum coating, aiming at improving the corrosion resistance of the new coating

Method used

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  • A kind of cold-sprayed aluminum-based corrosion-resistant coating and preparation method thereof
  • A kind of cold-sprayed aluminum-based corrosion-resistant coating and preparation method thereof
  • A kind of cold-sprayed aluminum-based corrosion-resistant coating and preparation method thereof

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Effect test

Embodiment 1

[0033] The preparation method of described cold-sprayed aluminum-based corrosion-resistant coating comprises the following steps:

[0034] (1) Choose Q235 carbon steel with a thickness of 3mm as the substrate, sandblast and degrease the surface, and then clean it with acetone and absolute ethanol ultrasonically. After cleaning and drying, seal it with a sample bag to avoid surface oxidation;

[0035] (2) Al (spherical particle size 10μm) and Al 2 o 3 The powder (with a particle size of 20 μm) was mixed mechanically, and the Al 2 o 3 The powder volume ratio is 30%; then add aluminum-magnesium alloy powder (particle size is 20 μm), mechanically mix evenly, the addition of aluminum-magnesium alloy powder accounts for 16.65% of the total mass, and the magnesium element accounts for 0.5% of the total mass, and the spray coating is obtained powder;

[0036] (3) Dry the spray powder obtained in step (2) in a vacuum oven at 90°C for 30 minutes;

[0037] (4) Turn on the cold spra...

Embodiment 2

[0040] The preparation method of described cold-sprayed aluminum-based corrosion-resistant coating comprises the following steps:

[0041] (1) Select A32 steel with a thickness of 4mm as the substrate, perform sandblasting and degreasing treatment on the surface, and then use acetone and absolute ethanol to clean it ultrasonically, and seal it with a sample bag after cleaning and drying to avoid surface oxidation ;

[0042] (2) Al (spherical particle size 20μm) and Al 2 o 3 The powder (particle size is 30 μm) is mechanically mixed, and the Al 2 o 3 The powder volume ratio is 30%; then add aluminum-magnesium alloy powder (particle size is 30 μm), mechanically mix evenly, the amount of aluminum-magnesium alloy powder added accounts for 6.5% of the total mass, and the magnesium element accounts for 0.2% of the total mass, and the spray coating is obtained powder;

[0043] (3) Dry the spray powder obtained in step (2) in a vacuum oven at 95°C for 28 minutes;

[0044] (4) Tur...

Embodiment 3

[0046] The preparation method of described cold-sprayed aluminum-based corrosion-resistant coating comprises the following steps:

[0047] (1) Choose Q235 carbon steel with a thickness of 3mm as the substrate, sandblast and degrease the surface, and then clean it with acetone and absolute ethanol ultrasonically. After cleaning and drying, seal it with a sample bag to avoid surface oxidation;

[0048] (2) Al (spherical particle size 30μm) and Al 2 o 3 The powder (with a particle size of 40 μm) was mixed mechanically, and the Al 2 o 3 The powder volume ratio is 30%; then add Al / RE powder (particle size is 10 μm), mechanically mix evenly, the addition of Al / RE powder accounts for 3.5% of the total mass, and the rare earth element accounts for 0.1% of the total mass, and the spray coating is obtained powder;

[0049] (3) Dry the spray powder obtained in step (2) for 35 minutes in a vacuum oven at 85°C;

[0050] (4) Turn on the cold spraying equipment, fix the substrate on th...

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Abstract

The invention relates to a cold-spraying aluminum-base corrosion-resistant coating and a preparation method thereof, and belongs to the technical field of metal surface treatment. The coating comprises Al, Al2O3 and M, wherein M is an aluminum rare earth alloy and / or an aluminum-magnesium alloy; in the Al and the Al2O3, the volume ratio X of the Al2O3 is 10%-35%; when the M is the aluminum-magnesium alloy, the mass ratio of an element Mg in the coating is 0.15%-2.5%; when M is an aluminum rare earth alloy, the mass ratio of an element RE in the coating is 0.02%-0.58%; when the M is a mixture of the aluminum-magnesium alloy and the aluminum rare earth alloy, the total mass ratio of the element Re and the element Mg is 0.02%-2.80% of the coating. The coating prepared by the preparation method has excellent corrosion resistance, and overcomes the defects that the aluminum coating has relatively low strength and relatively low hardness.

Description

technical field [0001] The invention relates to a cold-sprayed aluminum-based corrosion-resistant coating and a preparation method thereof, belonging to the technical field of metal surface treatment. Background technique [0002] With the development of large deep-sea oil and gas fields in my country, the application of deep-sea drilling rigs, drilling platforms, and floating production and storage devices will become increasingly widespread. The superstructure of these offshore oil and gas equipment has long faced the harsh marine atmospheric corrosion environment, and the problem of corrosion failure is extremely prominent, which brings huge risks to the long-term safe operation of the equipment. An inert oxide film can be formed on the surface of the aluminum coating, which has good uniform corrosion resistance and has broad application prospects as an anti-corrosion coating. However, the passive state of the aluminum coating in the marine environment is unstable, and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/04
CPCC23C24/04
Inventor 李焰白杨
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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