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Thermal diffusing permeation method of inorganic rare earth molten salt on surface of magnesium alloy

A magnesium alloy, thermal diffusion and infiltration technology, applied in the direction of metal material coating process, can solve the problems of thin diffusion layer and slow infiltration rate, and achieve the effect of simple operation, low cost and improved microstructure.

Inactive Publication Date: 2012-02-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] By searching the prior art documents, it can be known that Hu Wenbin's disclosed "method for protection against diffusion of inorganic molten salt on the surface of magnesium alloy" (publication number is CN 101058875A, published dated October 24, 2007), it was introduced that the surface of magnesium alloy is thermally diffused in the AlCl3-NaCl or AlCl3-NaCl-KCl system to form a highly efficient Mg-Al intermetallic compound layer with anti-corrosion properties, but this method has a slow penetration rate and a thinner diffusion layer

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  • Thermal diffusing permeation method of inorganic rare earth molten salt on surface of magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The material is cast AZ91D magnesium alloy, and the specific operation steps are:

[0021] (l) Carry out surface cleaning pretreatment to the magnesium alloy sample: successively use the sandpaper of different order number to polish smooth, then clean with alcohol and acetone, dry and set aside;

[0022] (2) anhydrous AlCl 3 , NaCl, KCl and CeCl 3 The powder is mixed evenly according to the following ratio, AlCl 3 The mass fraction is 66%, CeCl 3 The mass fraction is 5%, and the mass fraction ratio of NaCl and KCl is 1:1, forming an anhydrous inorganic rare earth molten salt system;

[0023] (3) Put the anhydrous inorganic rare earth molten salt system and the pretreated magnesium alloy sample into a stainless steel tank, so that the sample is embedded in the anhydrous inorganic rare earth molten salt system, and ensure that the magnesium alloy does not touch the stainless steel tank wall , seal the mouth of the jar with aluminum foil;

[0024] (4) Put the stainles...

Embodiment 2

[0028]The material is cast AZ91D magnesium alloy, and the specific operation steps are:

[0029] (l) Carry out surface cleaning pretreatment to the magnesium alloy sample: successively use the sandpaper of different order number to polish smooth, then clean with alcohol and acetone, dry and set aside;

[0030] (2) anhydrous AlCl 3 , NaCl, KCl and CeCl 3 The powder is mixed evenly according to the following ratio, AlCl 3 The mass fraction is 66%, CeCl 3 The mass fraction is 15%, and the mass fraction ratio of NaCl and KCl is 1:1, forming an anhydrous inorganic rare earth molten salt system;

[0031] (3) Put the anhydrous inorganic rare earth molten salt system and the pretreated magnesium alloy sample into a stainless steel tank, so that the sample is embedded in the anhydrous inorganic rare earth molten salt system, and ensure that the magnesium alloy does not touch the stainless steel tank wall , seal the mouth of the jar with aluminum foil;

[0032] (4) Put the stainles...

Embodiment 3

[0036] The material is cast AZ91D magnesium alloy, and the specific operation steps are:

[0037] (l) Carry out surface cleaning pretreatment to the magnesium alloy sample: successively use the sandpaper of different order number to polish smooth, then clean with alcohol and acetone, dry and set aside;

[0038] (2) anhydrous AlCl 3 , NaCl, KCl and CeCl 3 The powder is mixed evenly according to the following ratio, AlCl 3 The mass fraction is 66%, CeCl 3 The mass fraction is 5%, and the mass fraction ratio of NaCl and KCl is 1:1, forming an anhydrous inorganic rare earth molten salt system;

[0039] (3) Put the anhydrous inorganic rare earth molten salt system and the pretreated magnesium alloy sample into a stainless steel tank, so that the sample is embedded in the anhydrous inorganic rare earth molten salt system, and ensure that the magnesium alloy does not touch the stainless steel tank wall , seal the mouth of the jar with aluminum foil;

[0040] (4) Put the stainles...

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Abstract

The invention provides a thermal diffusing permeation method of an inorganic rare earth molten salt on the surface of a magnesium alloy. The method is characterized in that the magnesium alloy of which surface is cleaned is placed in an anhydrous inorganic rare earth molten salt system AlCl3-NaCl-KCl-CeCl3, the molten salt system is heated and the temperature is maintained, and a cerium-containing magnesium-aluminum intermetallic compound diffusion-permeation layer with high corrosion resistance is formed on the surface of the magnesium alloy through diffusing permeation. The method has the following advantages: on one hand, the rare earth element Ce in the molten salt system has the function of promoting permeation, thus the permeation of Al atom into the surface of the magnesium alloy is promoted; on the other hand, the rare earth element Ce has the function of microalloying, thus the microstructure of the diffusion-permeation layer can be improved and the corrosion resistance can be further increased. The metallurgical bonding of the diffusion-permeation layer and the matrix is realized, thus the surface cracking or peeling is not easy to generate. The thermal diffusing permeation method has simple operations, short production cycle, low cost and no pollution; and by the method, the corrosion resistance of the magnesium alloy can be obviously increased.

Description

technical field [0001] The invention relates to a method in the technical field of metal surface anticorrosion, in particular to a method for thermal diffusion and infiltration of inorganic rare earth molten salt on the surface of a magnesium alloy. Background technique [0002] Magnesium alloy is currently the lightest metal structure material in application and has many excellent properties, but the poor corrosion resistance of magnesium alloy hinders its further development and application. Therefore, surface treatment of magnesium alloys to improve their corrosion resistance is an effective way to promote the wide application of magnesium alloys in various fields. At present, the surface treatment technologies of magnesium alloys mainly include: conversion coating technology, anodic oxidation technology, electrochemical coating technology, vapor deposition technology, laser surface modification technology, organic coating technology, chemical heat treatment technology, e...

Claims

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Application Information

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IPC IPC(8): C23C22/70
Inventor 刘生发缪花明韩辉王硕黎吕程
Owner WUHAN UNIV OF TECH