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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 process and its equipment, can solve the problems of semi-solid slurry rapid quantitative transportation forming equipment docking problem has not been well solved, and achieve the expansion of manufacturing channels , Simple device and low cost input

Inactive Publication Date: 2007-08-08
TSINGHUA UNIV
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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

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preparation example Construction

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

[0038] The preparation of AZ31 magnesium alloy semi-solid billet with uniform composition, structure and performance and round and fine particles is the prerequisite for rheological extrusion forming of sacrificial magnesium anode. The present invention uses a resistance furnace to heat the dried block commercial AZ31 magnesium alloy ingots, at the same time uses argon as a protective gas, and uses a foamed magnesium alloy covering agent to protect the molten magnesium alloy liquid. After reaching the complete melting temperature of 632°C, the temperature was kept for 30 minutes.

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

[0040] Design and process a half-open stainless steel crucible, the volume of the crucible is equal to the volume of the magnesium anode. Fix two half-open crucibles on both sides of a clamp that is convenient for manual operation, which can solve the problem of r...

Embodiment 1

[0048] Now take the AZ31 sacrificial magnesium anode with a rheological extrusion diameter of 21.34mm (0.84″) and a length of 100mm as an example to illustrate the production process. The internal iron core material is Q235C low carbon steel, and the diameter size is 3.43mm( 0.135"). First, use a resistance furnace to heat and melt the dried commercial AZ31 magnesium alloy ingots that have been dried (dry at 100°C). At the same time, argon is used as a protective gas, and a foamed magnesium alloy covering agent is used to protect the molten magnesium alloy liquid. After reaching the complete melting temperature of 632°C, the temperature was kept for 30 minutes. Design and process the stainless steel for storing magnesium alloy liquid can be divided into a crucible, the volume of which is equal to the volume of the produced magnesium anode. To ensure uniform heat dissipation of the slurry, the inner diameter of the stainless steel crucible is approximately equal to its depth. F...

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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 of a sacrificial magnesium anode and a device thereof, and belongs to the technical field of semi-solid forming. Background technique [0002] Corrosion is a destructive corrosion caused by chemical or electrochemical reactions between metals and the surrounding environment. The direct or indirect loss of metal materials caused by corrosion is huge, and there are many methods to prevent metal corrosion. Among them, the sacrificial magnesium anode protection method is the most important one. This is due to the high chemical activity of magnesium and magnesium alloys. It is directly connected with the protected metal to form a current loop, which makes the metal cathodic polarization and achieves the protective effect. At present, with the exception of a small amount of sacrificial magnesium anodes using AZ63 cast magnesium alloy for casting, the vast majority of sacrificial magnesiu...

Claims

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Application Information

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Patent Type & Authority Applications(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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