Cleaning liquor and treatment method for removing residual magnesium alloys in die

A technology of cleaning solution and processing method, applied in the field of cleaning solution for removing residual magnesium alloy in molds, can solve problems such as complicated operation, difficult cleaning, mold corrosion, etc., and achieve the effects of low solution cost, easy control, and simple operation

Inactive Publication Date: 2013-12-25
TIANJIN DONGYI MAGNESIUM PROD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extrusion die is not the case. Due to the complex design structure and the limitation of the forming principle, it is quite troublesome to clean the inside of the mold cavity. In addition, after the magnesium alloy is heated at high temperature, some alloys adhere to the mold, making it even more difficult to clean.
[0005] At present, the solution used by some enterprises is complicated to prepare, cumbersome to operate, and the cleaning effect is not good. At the same time, it will cause certain corrosion to the mold during the cleaning process. After a long period of use, it will cause a large change in the size of the mold, shorten the life of the mold, and increase production costs.

Method used

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  • Cleaning liquor and treatment method for removing residual magnesium alloys in die

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Effect test

Embodiment 1

[0027] Firstly, in step (1), the extrusion die is pretreated, for example, using a hammer or other equipment to chisel out or punch out the large magnesium alloy in the split hole, so as to reduce the consumption of the magnesium alloy on the treatment solution.

[0028] Next, in step (2), put the pretreated mold into the prepared cleaning solution to clean the residual magnesium alloy in the mold.

[0029] In this embodiment, the concentration of the solution used to clean the residue in the magnesium alloy mold is 80 ml of hydrochloric acid, 2 g of ammonium citrate, 0.8 g of EDTA, 20 g of corrosion inhibitor, and 880 g of water. The temperature of the cleaning solution is 50°C, and the cleaning time is 1 hour.

[0030] In step (3), rinse the black film on the surface of the cleaned mold with tap water.

[0031] Rinse the black film on the surface of the mold with water, then flush the mold with 100°C hot water for 30 minutes according to step (4), and let the heat generated...

Embodiment 2

[0033] In this embodiment, the treatment method for cleaning the residues in the magnesium alloy mold is the same as that of the first embodiment above. Only the differences from the first embodiment will be described below.

[0034] In this embodiment, in the cleaning treatment of step (2), the concentrations used for cleaning are 100 ml of hydrochloric acid, 4 g of ammonium citrate, 1.2 g of EDTA, 18 g of corrosion inhibitor, and 950 g of water. The temperature of the cleaning solution is 60°C, and the cleaning time is 30 minutes.

[0035] In step (4), the mold is rinsed with hot water, the temperature of the water used is controlled at 80° C., and the time is 40 minutes.

Embodiment 3

[0037] In this embodiment, the concentration of the solution used to clean the residue in the magnesium alloy mold is 60 g of hydrochloric acid, 1 g of ammonium citrate, 0.5 g of EDTA, 1 g of corrosion inhibitor, and 800 g of water. The temperature of the cleaning solution is 100°C, and the cleaning time is 1.5 hours.

[0038] In step (3), rinse the black film on the surface of the cleaned mold with tap water.

[0039] Rinse the black film on the surface of the mold with water, then flush the mold with 100°C hot water for 40 minutes according to step (4), and let the heat generated by the mold dry itself.

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Abstract

The invention provides cleaning liquor for removing residual magnesium alloys in a die. The cleaning liquor comprises the following components in percentage by weight: 60-240g of hydrochloric acid, 1-10g of ammonium citrate, 0.5-2g of EDTA (Ethylene Diamine Tetraacetic Acid), 5-55g of a corrosion inhibitor and 750-950g of water. Meanwhile, the invention provides a treatment method for cleaning the residual magnesium alloys by using the cleaning liquor according to the following four steps: pretreatment, cleaning, removing black films and washing by hot water. The cleaning liquor and treatment method have the benefits that damages cannot caused to the die and no influence is made on dimensional precision of the die, and configuration and operating method are simple and feasible, so that the surface roughness Ra1.0-1.5 of the die is effectively guaranteed. Referring to standards of GB8923-1988 Rusting Grade on Surface of Steel Products and Derusting Grade before Coating, according to the method, the surface rusting condition of the die is improved from grade D to grade A, and the grade Sa 3 of compressed-air blast cleaning is realized, so that one grade is raised relative to that of existing die cleaning liquor in the existing market.

Description

technical field [0001] The invention relates to a cleaning solution and a treatment method for removing residual magnesium alloy in a mold. Background technique [0002] Due to the advantages of low density, high specific strength and specific modulus, shock absorption and resistance to electromagnetic radiation, magnesium alloys have broad application prospects in aviation, aerospace, transportation, electronics, electrical appliances and other fields. But so far, the research on the extrusion technology of magnesium alloy profiles with complex sections is still in its infancy. [0003] At present, most magnesium alloy products are castings, especially die castings, and there are very few plastic processed products. However, the mechanical properties, product shape and size of die castings have certain limitations, so the research on wrought magnesium alloys has become an important direction in the development of the world's magnesium industry. Extrusion molding technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/04C23G1/08
Inventor 穆锦辉李国壮陈利红崔妍
Owner TIANJIN DONGYI MAGNESIUM PROD
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