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Manufacturing process for rheologic extrusion molding of sacrificial magnesium anode and device thereof

A preparation process and extrusion forming technology, which is applied in the field of rheological extrusion forming preparation technology and its devices, can solve the problems of rapid quantitative transportation of semi-solid slurry and the docking of forming equipment has not been well solved, and can expand manufacturing methods. , The effect of simple installation and low cost investment

Inactive Publication Date: 2008-12-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the most important reasons is that the problem of rapid quantitative transportation of semi-solid slurry and the docking with forming equipment has not been well resolved.
So far, except for NRP technology and double-helix rheological deformation technology and other literature reports, the use of rheological extrusion technology for sacrificial magnesium anode preparation has not been reported in the literature

Method used

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  • Manufacturing process for rheologic extrusion molding of sacrificial magnesium anode and device thereof
  • Manufacturing process for rheologic extrusion molding of sacrificial magnesium anode and device thereof

Examples

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preparation example Construction

[0037] (1) Preparation of AZ31 magnesium alloy slurry

[0038] Preparation of AZ31 magnesium alloy semi-solid billet with uniform composition, microstructure and performance, round and fine particles is the prerequisite for rheoextrusion forming sacrificial magnesium anode. The invention uses a resistance furnace to heat the dry-processed bulk commercial AZ31 magnesium alloy ingot, uses argon as a protective gas, and uses a foaming magnesium alloy covering agent to protect the molten magnesium alloy liquid. After reaching the complete melting temperature of 632°C, keep the temperature for 30 minutes.

[0039] (2) Device design for rapid quantitative delivery of semi-solid slurry

[0040] Design and process a stainless steel crucible that can be opened in half. The volume of the crucible is equal to the volume of the magnesium anode. Two pairs of half-open crucibles are respectively fixed on both sides of a clamp that is convenient for manual operation, which can solve the pr...

Embodiment 1

[0048] Now the rheological extrusion diameter is ( ), AZ31 sacrificial magnesium anode with a length of 100mm is taken as an example to illustrate its production process. The inner core material is Q235C low carbon steel, the diameter size is ( ). First, the block commercial AZ31 magnesium alloy ingot that has been dried (dried at 100°C) is heated and melted in a resistance furnace, and argon is used as a protective gas at the same time, and the molten magnesium alloy liquid is protected by a foamed magnesium alloy covering agent. After reaching the complete melting temperature of 632°C, keep the temperature for 30 minutes. Design and process a stainless steel crucible for storing magnesium alloy liquid, which can be divided into two parts, and its volume is equal to the volume of the produced magnesium anode. In order to ensure uniform heat dissipation of the slurry, the inner diameter of the stainless steel crucible is approximately equal to its depth. Fix (weld) t...

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Abstract

The invention relates to the making of a fluid compression molding of a sacrificial magnesium anode. It heats the magnesium ingot with argon as the protective gas, foaming magnesium alloy coating the smelt alloy solution till the complete smelting temperature of 632deg.C and keeping 30 minutes, preheating the split copple till 250deg.C-280deg.C, pouring the magnesium alloy solutin into the copple and controlled for cooling, getting 20% semi solid blanks when the temperature drops to 618deg.C, preheating the extrusion mold to 250-300deg.C and opening the split copple, dropping the semi solid blank into the extrusion mold, extruding the semi solid blank till the acquisition of AZ31 sacrificial magnesium positive electrode. It expands the making ways of sacrificial magnesium positive electrode with reduced energy consumption and improved quality.

Description

technical field [0001] The invention relates to a rheological extrusion forming preparation process and a device for sacrificial magnesium anodes, and belongs to the technical field of semi-solid forming. Background technique [0002] Corrosion is a destructive erosion caused by chemical or electrochemical reactions between metals and the surrounding environment. The direct or indirect losses caused by corrosion to metal materials are huge, and there are many methods to prevent metal corrosion, among which the sacrificial magnesium anode protection method is the most important one. This is due to the high chemical activity of magnesium and magnesium alloys, which are directly connected to the protected metal to form a current loop, which makes the metal cathodically polarized and achieves the protective effect. At present, except for a small amount of AZ63 cast magnesium alloy casting and forming sacrificial magnesium anodes, most of the sacrificial magnesium anodes are pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C31/00B21C23/32B21C23/22B21C23/21B21C26/00B21C25/02B21C29/04C22B9/16C10M103/02
Inventor 王开坤
Owner TSINGHUA UNIV
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