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Magnesium alloy metal-mold low-pressure casting lift-tube coatings and preparation method thereof

A technology of low-pressure casting and riser tubes, which is applied in casting molding equipment, metal processing equipment, coatings, etc., can solve the problems of water glass loss of cohesion, decrease of water glass cohesion, loss of cohesion, etc., to achieve Good adhesion, prolonging the average life, and the effect of preventing corrosion

Inactive Publication Date: 2011-01-12
FENGYANG L S NET FORMING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage as a riser coating is that water glass has a bonding effect below 800 °C, and above 800 °C, due to the appearance of a liquid phase, the water glass cohesion decreases or even loses cohesion (Li Yuancai. Casting coatings and their application [M]. Beijing: Machinery Industry Press, 2007: 66), while the melting temperature of molten magnesium is 650-850 ° C, in this temperature range, water glass is easy to lose cohesion, resulting in coating failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The weight percent of the prepared magnesium alloy low-pressure casting rising pipe paint is: 14% of magnesium oxide, 5% of bentonite, 3% of sodium hexametaphosphate, 3% of boric acid, and the balance is water.

[0020] Mix 12g sodium hexametaphosphate and 12g boric acid, add water to make A, wherein the quality of water is three times of the total weight of sodium hexametaphosphate and boric acid; get 20g bentonite and add water to make B, wherein the quality of water is equal to the quality of bentonite; Add 56g of magnesium oxide powder to A to make C; then mix B and C, add the rest of the water, and stir evenly.

[0021] When in use, the riser pipe does not need to be heated, and it is coated by brushing or dipping, and a 0.2mm thick coating is applied to the inner wall and outer wall of the riser pipe, and it can be used after drying.

[0022] The coating can effectively prevent the iron from polluting the molten magnesium and prolong the life of the riser by 0.5 t...

Embodiment 2

[0024] The weight percent of the prepared magnesium alloy low-pressure casting rising pipe paint is: 20% of magnesium oxide, 4% of bentonite, 5% of sodium hexametaphosphate, 1% of boric acid, and the balance is water.

[0025] Mix 15g sodium hexametaphosphate and 3g boric acid, add water to make A, wherein the quality of water is three times of the total weight of sodium hexametaphosphate and boric acid; get 12g bentonite and add water to make B, wherein the quality of water is equal to the quality of bentonite; Add 60g of magnesium oxide powder to A to make C; then mix B and C, add the rest of the water, and stir evenly.

[0026] When in use, the riser pipe does not need to be heated, and it is coated by brushing or dipping, and a 0.25mm thick coating is applied to the inner and outer walls of the riser pipe, and it can be used after drying.

[0027] The coating can effectively prevent the iron from polluting the molten magnesium and prolong the life of the riser by 0.4 times...

Embodiment 3

[0029] The weight percent of the prepared magnesium alloy low-pressure casting rising pipe paint is: 30% of magnesium oxide, 9% of bentonite, 8% of sodium hexametaphosphate, 4% of boric acid, and the balance is water.

[0030] Mix 20g sodium hexametaphosphate and 10g boric acid, add water to make A, wherein the quality of water is three times of the total weight of sodium hexametaphosphate and boric acid; get 22.5g bentonite and add water to make B, wherein the quality of water is equal to the quality of bentonite; Take 75g of magnesium oxide powder and add it to A to make C; then mix B and C, add the rest of the water, and stir evenly.

[0031] When in use, the riser pipe does not need to be heated, and it is coated by brushing or dipping, and a 0.3mm thick coating is applied to the inner wall and outer wall of the riser pipe, and it can be used after drying.

[0032] The coating can effectively prevent the iron from polluting the molten magnesium and prolong the life of the ...

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Abstract

The invention relates to a magnesium alloy low-pressure casting riser tube coating as well as a preparation method thereof, belonging to the metallic material field. The coating has the compositions and weight percentages: magnesium oxide: 14 to 30 percent, bentonite: 3 to 10 percent, sodium hexametaphosphate: 3 to 8 percent, boric acid: 1 to 5 percent, and water: 49 to 75 percent. The method comprises: mixing sodium hexametaphosphate and boric acid, and adding water thereto for preparing A, wherein, the weigh of water is three times of the gross weight of the sodium hexametaphosphate and boric acid; adding water into the bentonite to prepare B, wherein, the weigh of water is equal to the weight of the bentonite; adding magnesium oxide powder to A for preparing C; and then mixing B and C,and adding balance water into the mixture which is agitated evenly. The invention coating has advantages of simple compositions, convenient preparation, rather strong cohesiveness, good suspension property, fire resistance property, stability and coating property, and solves the problems that the common coating is easy to react with magnesium alloys, and the high-temperature failure of the coating is easy to take place, and the invention can effectively prevent the corrosion of riser tubes by magnesium liquid, reduce the pollution of the magnesium liquid, protect the riser tubes, and prolong the service life of the riser tubes.

Description

technical field [0001] The invention relates to a paint in the technical field of metal materials and a preparation method thereof, in particular to a magnesium alloy low-pressure casting riser paint and a preparation method thereof. Background technique [0002] The chemical properties of magnesium are very active, and it is very easy to react with oxygen and water vapor in the atmosphere during the high temperature process. The heat released by the reaction will cause the local temperature to be too high, which will cause the paint to react with the magnesium liquid and fall off. [0003] The riser refers to the pipe that guides the liquid metal in the sealed crucible into the mold during low-pressure casting. The low-pressure casting riser of magnesium alloy is generally made of cast iron or steel. For a long time, there is no special paint for the riser pipe, but it is replaced by general metal casting paint. [0004] Found through document retrieval to prior art, provi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00
Inventor 张亮彭立明王迎新丁文江陈广森
Owner FENGYANG L S NET FORMING CO LTD