A Micro-arc Oxidation Process of mg‑gd‑y‑zr Cast Magnesium Alloy

A casting magnesium alloy, micro-arc oxidation technology, applied in anodic oxidation and other directions, can solve the problem of high alloy cost, achieve the effect of dense and uniform structure, good corrosion resistance, and protection from corrosion

Inactive Publication Date: 2017-09-29
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high cost of the alloy after adding rare earth elements, rare earth magnesium alloys were mainly used in military fields such as aerospace and missiles in the past, but with the development of society and economy, military and civilian fields have been greatly expanded.

Method used

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  • A Micro-arc Oxidation Process of mg‑gd‑y‑zr Cast Magnesium Alloy
  • A Micro-arc Oxidation Process of mg‑gd‑y‑zr Cast Magnesium Alloy
  • A Micro-arc Oxidation Process of mg‑gd‑y‑zr Cast Magnesium Alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of micro-arc oxidation treatment process of Mg-Gd-Y-Zr cast magnesium alloy provided by the invention, its steps are as follows:

[0025] 1) Preparation of electrolytes for each process:

[0026] Prepare pre-treatment solution: prepare 50g / L NaOH solution and 5g / L Y(NO 3 ) 3 solution;

[0027] Preparation of micro-arc oxidation electrolyte: Na 2 SiO 3 10g / L, Na 2 B 4 o 4 10g / L, Na 3 PO 4 10g / L, (NaPO 4 ) 6 10g / L, Ni(CH 3 COO) 2 0.5g / L, NaOH 5g / L;

[0028] Preparation of subsequent treatment solution: Na 2 SiO 3 10g / L, NaOH 40g / L, NaF 20g / L.

[0029] 2) Mg-Gd-Y-Zr cast magnesium alloy pretreatment process:

[0030] Put the Mg-Gd-Y-Zr cast magnesium alloy sample into 50g / L NaOH solution, keep it warm at 60°C for 10min, wash it with deionized water, and then put the treated sample into 5g / L Y(NO 3 ) 3 solution, soak for 5 minutes at room temperature, take it out, wash it with deionized water, and dry it in the air.

[0031] 3) Micro-arc oxidation...

Embodiment 2

[0038] A kind of micro-arc oxidation treatment process of Mg-Gd-Y-Zr cast magnesium alloy provided by the invention, its steps are as follows:

[0039] 1) Preparation of electrolytes for each process:

[0040] Prepare pre-treatment solution: prepare 65g / L NaOH solution and 10g / L Y(NO 3 ) 3 solution;

[0041] Preparation of micro-arc oxidation electrolyte: Na 2 SiO 3 15g / L, Na 2 B 4 o 4 20g / L, Na 3 PO 4 15g / L, (NaPO 4 ) 6 20g / L, Ni(CH 3 COO) 2 1.0g / L, NaOH 10g / L;

[0042] Preparation of subsequent treatment solution: Na 2 SiO 3 15g / L, NaOH 50g / L, NaF 30g / L.

[0043] 2) Mg-Gd-Y-Zr cast magnesium alloy pretreatment process:

[0044] Put the Mg-Gd-Y-Zr cast magnesium alloy sample into 65g / L NaOH solution, keep it warm at 70°C for 15min, wash it with deionized water, then put the treated sample into 10g / L Y(NO 3 ) 3 solution, soak for 5 minutes at room temperature, take it out, wash it with deionized water, and dry it in the air.

[0045] 3) Micro-arc oxidation ...

Embodiment 3

[0052] A kind of micro-arc oxidation treatment process of Mg-Gd-Y-Zr cast magnesium alloy provided by the invention, its steps are as follows:

[0053] 1) Preparation of electrolytes for each process:

[0054] Prepare pre-treatment solution: prepare 80g / L NaOH solution and 15g / L Y(NO 3 ) 3 solution;

[0055] Preparation of micro-arc oxidation electrolyte: Na 2 SiO 3 20g / L, Na 2 B 4 o 4 30g / L, Na 3 PO 4 20g / L, (NaPO 4 ) 6 30g / L, Ni(CH 3 COO) 2 1.5g / L, NaOH 15g / L;

[0056] Preparation of subsequent treatment solution: Na 2 SiO 3 20g / L, NaOH 60g / L, NaF 30g / L.

[0057] 2) Mg-Gd-Y-Zr cast magnesium alloy pretreatment process:

[0058] Put the Mg-Gd-Y-Zr cast magnesium alloy sample into 80g / L NaOH solution, keep it warm at 80°C for 20min, wash it with deionized water, and then put the treated sample into 15g / L Y(NO 3 ) 3 solution, soak for 5 minutes at room temperature, take it out, wash it with deionized water, and dry it in the air.

[0059] 3) Micro-arc oxidat...

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Abstract

The invention belongs to the field of magnesium alloy surface treatment, and particularly relates to a micro-arc oxidation treatment technology of an Mg-Gd-Y-Zr casting magnesium alloy. The micro-arc oxidation treatment technology of the Mg-Gd-Y-Zr casting magnesium alloy comprises specific steps as follows: (1), preparing solutions required by treatment processes; (2), performing high rare earth casting magnesium alloy pretreatment process; (3), performing staging micro-arc oxidation treatment process of the Mg-Gd-Y-Zr casting magnesium alloy; (4), performing follow-up treatment process of the Mg-Gd-Y-Zr casting magnesium alloy, wherein a micro-arc oxidation electrolyte comprises components of 10-20 g / L of Na2SiO3, 10-30 g / L of Na2B4O4, 10-20 g / L of Na3PO4, 10-30 g / L of (NaPO4)6, 0.5-1.5 g / L of Ni (CH3COO)2 and 5-15 g / L of NaOH, and a follow-up treatment solution comprises components of 10-20 g / L of Na2SiO3, 40-60 g / L of NaOH and 20-40 g / L of NaF. The micro-arc oxidation process adopts staging treatment, so that the Mg-Gd-Y-Zr casting magnesium alloy can obtain a uniform brown film layer with good corrosion resistance through surface treatment, and further application of the high rare earth casting magnesium alloy becomes possible.

Description

technical field [0001] The invention relates to a micro-arc oxidation treatment process for Mg-Gd-Y-Zr cast magnesium alloy, which belongs to the technical field of magnesium alloy surface treatment. Background technique [0002] Mg-Gd-Y-Zr series alloy, as a high-strength and heat-resistant magnesium alloy, has received more and more attention in practical applications, because the solid solubility of Gd and Y in the magnesium matrix increases with the increase of temperature , so under the condition that the alloy composition has been determined, its optimal performance can be developed by optimizing the solid solution process parameters and aging process parameters; and different heat treatment process schemes can be formulated according to the use requirements. Due to the high cost of the alloy after adding rare earth elements, rare earth magnesium alloys were mainly used in military fields such as aerospace and missiles in the past, but with the development of society a...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C25D11/30
CPCC25D11/30
Inventor毛红奎杨晓禹徐宏张国伟
OwnerZHONGBEI UNIV