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Magnalium special metal coating and preparation method thereof

A technology for dissimilar metals and coatings, which is applied in the field of preparation of dissimilar metal coatings, can solve the problem of not proposing a method for magnesium-aluminum intermetallic compounds, etc., and achieve the effects of improving hardness and corrosion resistance, low cost, and improved corrosion resistance.

Inactive Publication Date: 2010-05-19
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When studying the corrosion resistance of magnesium alloys at home and abroad, it is found that the magnesium-aluminum intermetallic compounds in magnesium alloys not only have high hardness, but also have good corrosion resistance, but it has not been proposed to prepare a large amount of magnesium-aluminum intermetallic compounds. method, nor link it to the preparation of thermal spray coatings

Method used

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  • Magnalium special metal coating and preparation method thereof
  • Magnalium special metal coating and preparation method thereof
  • Magnalium special metal coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Preparation of magnesium-aluminum dissimilar metal coating by arc spraying on the surface of aluminum alloy

[0025] The aluminum-silicon casting alloy ZL102 is selected as the substrate to be protected, and the surface is sandblasted with 30 mesh alumina particles to remove surface oxides and dirt to achieve a cleanliness and roughness suitable for spraying.

[0026] The spraying electrode adopts high-purity magnesium wire with a magnesium content of more than 99.7% and a high-purity aluminum wire with an aluminum content of more than 99.7%, both of which have a diameter of 2.0mm.

[0027] Use the DPT302 high-speed arc spraying machine, the arc spraying process parameters are: spraying voltage 28V, current 150A, spraying distance 150mm, air pressure 0.6MPa.

[0028] Such as figure 1 As shown, the magnesium wire 1 and the aluminum wire 2 are used as two electrodes, which are controlled by the wire feed wheel 5 to enter the contact tip 4 respectively. After th...

Embodiment 2

[0031]Example 2 Preparation of magnesium-aluminum dissimilar metal coatings by arc-spraying magnesium on the surface of aluminum alloy

[0032] The selection of the substrate to be protected and the surface treatment before spraying are the same as in Example 1.

[0033] The spraying electrode adopts magnesium alloy wire (96.8%Mg+3%Al+0.2% impurity) with a diameter of 1.6mm, and aluminum wire (99.7%Al+0.3% impurity) with a diameter of 2.0mm.

[0034] Use the DPT302 high-speed arc spraying machine, the arc spraying process parameters are: spraying voltage 29V, current 160A, spraying distance 160mm, air pressure 0.7MPa.

[0035] The spraying process is the same as in Example 1, and the obtained coating composition and its weight ratio are: Mg22-25%, Al74-77%, other 2-10% (mainly oxygen).

[0036] The coating is heat-treated at 420°C for 50 minutes in an argon-filled heat treatment furnace. According to XRD detection, the coating structure is rich in Al 12 Mg 17 Phase and Al ...

Embodiment 3

[0038] Example 3 Preparation of Magnesium-Al Alloy Dissimilar Metal Coating by Plasma Spraying on Aluminum Alloy Surface

[0039] The selection of the substrate to be protected and the surface treatment before spraying are the same as in Example 1.

[0040] The raw materials for spraying are magnesium powder and aluminum powder with a purity higher than 99.9% and a particle size of 10 μm, and the volume ratio is 1:6.

[0041] Using ZB-80 plasma spraying machine, the process parameters are spraying current 500A, voltage 50V, Ar flow rate 60L / min, H 2 The flow rate is 6L / min, the powder feeding rate is 3.0Kg / h, and the spraying distance is 150mm.

[0042] The magnesium-aluminum mixed powder is sent into the flame flow part through the powder feeding system to generate a plasma flame flow, and an aluminum-magnesium metal coating with high bonding strength and dense coating structure is prepared on the surface of the aluminum alloy substrate. The composition and weight ratio of ...

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Abstract

The invention belongs to the technical field of hot spraying, and relates to a preparation method of a special metal coating. The preparation method comprises the following steps: adopting electric arc spraying, plasma spraying or ultrasonic flame spraying; and performing electric arc spraying on magnesium wire or aluminum wire serving as two electrodes in the diameter ratio of 1:1-1:3, or performing plasma spraying or ultrasonic flame spraying on a mixture of magnesium powder with the particle size between 0.2 and 100mu m and aluminum powder serving as raw materials in a ratio of 1:1-1:9 to obtain the coating, wherein the coating comprises the following components by weight: 5.5 to 40.0 percent of Mg, 55.0 to 93.0 percent of Al and less than or equal to 10 percent of other components. The special coating has the advantages of having good cathode protection effect on steel and metals with lower electrode potential such as aluminum, zinc and the like. After being subjected to heat treatment at the temperature of between 200 and 470 DEG C for 30 to 150 minutes, the coating is rich in Al12Mg17 phase and Al3Mg2 phase, thereby further improving the rigidity and corrosion resistance of the coating.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying and relates to a preparation method of a heterogeneous metal coating. Background technique [0002] Thermal spraying technology is a spraying method developed in the late 1980s. It is a material surface strengthening and surface modification technology. This technology has the characteristics of high efficiency, low cost, and simple operation. [0003] The current research on thermal spraying technology has developed from spraying metal wires or powders of the same material to spraying dissimilar metals and preparing alloy or pseudo-alloy composite coatings. The alloy or pseudo-alloy coating of dissimilar metals can realize the complementary properties of dissimilar metals, reduce the requirements for the surface finish of the substrate, have strong corrosion resistance, and have better overall performance than a single coating. Patent application "High Power Arc Zinc and Aluminum Pseudo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/08C23C4/18C22C21/06C23C4/129C23C4/131C23C4/134
Inventor 刘黎明宋刚张兆栋徐荣正
Owner DALIAN UNIV OF TECH
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