Magnesium alloy surface corrosion-resistant coating preparation method

A magnesium alloy and coating technology, which is applied in metal material coating process, coating, gaseous chemical plating, etc. Dense bonding, industrial adaptability, difficulty in generating three-dimensional corrosion-resistant layers or step coverage, etc., to achieve the effect of accurate stoichiometry

Inactive Publication Date: 2017-09-15
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned coating technology is generally only suitable for the preparation of one or several kinds of corrosion-resistant coatings, and the types of materials for corrosion-resistant coatings are limited; Combination and industrial adaptability of the substrate; and it is difficult to generate a three-dimensional corrosion-resistant layer or step coverage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The magnesium alloy sample is AZ31 with a size of 90mm×90mm×0.5mm, the surface is mirror polished (less than Ra0.2), and the thickness of Al is plated with 20nm. 2 o 3 The corrosion resistant layer is made of trimethylaluminum (TMA for short), water (H 2 O) is the reaction gas source. The sample was dehydrogenated. ALD chamber preparation. Set the temperature of the heater, purge, heat trap, and pump tube to 150°C, 120°C / 80°C, 400°C, and 100°C respectively; the process pressure is 0.15torr; 2 O gas injection and purging time are 0.02s and 60s, and the coating preparation is completed after 400 cycles. ALD working chamber reduction, sampling. Detected by atom probe characterization (AFM), the thickness of the coating was 20nm; the drop test before and after plating the corrosion resistant layer (dissolved 0.05 g potassium permanganate and 5 ml nitric acid in 95 ml distilled water was dropped on the test The surface of the sample, the time for the solution to change...

Embodiment 2

[0021] The magnesium alloy sample is AZ31 with a size of 90mm×90mm×0.5mm, and the surface is mirror polished (below Ra0.2) and plated with 25nm thick Al 2 o 3 The corrosion resistant layer is made of trimethylaluminum (TMA for short), water (H 2 O) is the reaction gas source. The sample was dehydrogenated. ALD chamber preparation. Set the temperature of the heater, purge, heat trap, and pump tube to 150°C, 120°C / 80°C, 400°C, and 100°C respectively; the process pressure is 0.15torr; 2 O gas injection and purging time are 0.02s and 60s, and the coating preparation is completed after 500 cycles. ALD working chamber reduction, sampling. Detected by atom probe characterization (AFM), the thickness of the coating was 25nm; the drop test before and after plating the corrosion resistance layer (dissolved 0.05 g potassium permanganate and 5 ml nitric acid in 95 ml distilled water was dropped on the test The surface of the sample, the time for the solution to change from purple to...

Embodiment 3

[0023] The magnesium alloy sample is AZ31 with a size of 90mm×90mm×0.5mm, and the surface is mechanically ground (SMAT treatment 3min, Ra10) and plated with 20nm thick Al 2 o 3 The corrosion resistant layer is made of trimethylaluminum (TMA for short), water (H 2 O) is the reaction gas source. The sample was dehydrogenated. ALD chamber preparation. Set the temperature of the heater, purge, heat trap, and pump tube to 150°C, 120°C / 80°C, 400°C, and 100°C respectively; the process pressure is 0.15torr; 2 O gas injection and purging time are 0.02s and 60s, and the coating preparation is completed after 400 cycles. ALD working chamber reduction, sampling. The thickness of the coating is 20nm; drop test before and after plating the anti-corrosion layer (dissolve the purple solution of 0.05 g potassium permanganate and 5 ml nitric acid in 95 ml distilled water on the surface of the sample, and see that the solution changes from purple to colorless The time) is 3.2s and 66s resp...

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Abstract

The invention discloses a magnesium alloy surface corrosion-resistant coating preparation method. The magnesium alloy surface corrosion-resistant coating preparation method comprises the following steps: (1) removing hydrogen from a magnesium alloy; (2) preparing an ALD (Atomic Layer Deposition) working cavity; (3) preparing a corrosion-resistant by adopting ALD; (4) reducing in the ALD working cavity. According to the magnesium alloy surface corrosion-resistant coating preparation method, an Atomic Layer Deposition technology is adopted; the self-limiting properties (adsorption self-limiting property and reaction self-limiting property) of a preparation process are utilized, various types of oxides, nitrides and composite corrosion-resistant coatings which are good in thickness uniformity, precise in component control and high in compactness and have strong combining property with a magnesium alloy substrate are prepared on the surface of the magnesium alloy. In the preparation, the coating can be prepared on a surface of any shape, and the temperature is the only process parameter; the controllability and the process stability are high.

Description

technical field [0001] The invention belongs to the surface modification treatment technology of magnesium alloys, in particular to the preparation of surface corrosion-resistant coatings of magnesium alloys. Background technique [0002] Magnesium alloy is the lightest metal structural material in practical application. It has the advantages of high specific strength, high specific modulus and easy recycling. It is known as "green engineering material in the 21st century". With the depletion of many metal mineral resources, magnesium has been paid more and more attention due to its rich resources, especially the start of large-scale engineering projects such as large aircraft, moon orbiting, high-speed rail transit, and electric vehicles that have high requirements for lightweight structures in my country. , There is a greater demand for magnesium alloys. With the continuous deepening of research on magnesium alloys in our country, great progress has been made in the techni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/455
CPCC23C16/45527
Inventor 罗岚刘勇王雨郭锐丁岩
Owner NANCHANG UNIV
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