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Surface treatment method for aluminum alloy die casting and product thereof

A technology of surface treatment and surface treatment agent, which is applied in the direction of surface coating liquid device, metal material coating process, liquid chemical plating, etc. Anode dyeing, magnesium alloy chemical properties live wave and other problems, to achieve the effect of simple surface treatment method, dense alloy layer and good corrosion resistance

Inactive Publication Date: 2016-10-26
HANSHAN ZHAOXIA CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when die-casting parts are applied to exterior decoration parts, there are mainly the following two problems: First, the alloy material used for die-casting determines that die-casting parts cannot be treated with high-quality surface treatment, such as magnesium alloys with active chemical properties and poor corrosion resistance. The surface treatment of exterior parts must be done by spraying paint or filming, and the workpiece will have no metallic texture after treatment; for another example, commonly used die-casting aluminum alloys cannot be anodized
Second, die castings have inherent and inevitable casting defects, such as pores, cracks, inclusions, local depressions or flow marks, etc. These defects make the post-manufacturing process very difficult, and also make the yield of die casting products low

Method used

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  • Surface treatment method for aluminum alloy die casting and product thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] A method for surface treatment of an aluminum alloy die casting, comprising the steps of:

[0028] S1. Pretreatment of die castings:

[0029] a. Shot blasting treatment: Use stainless steel projectiles with a size of 0.25-0.4mm at a projectile speed of 55m / s to perform shot blasting treatment on the die-casting parts to remove the oxide skin on the surface of the die-casting parts; It is ultrasonically cleaned;

[0030] b. Wax removal: Dip the die-casting parts with descaled surface into 10 parts of triethanolamine oleic acid soap, 3 parts of polyacrylamide, 0.5 parts of coconut oleic acid diethanolamide, 5 parts of tetrasodium edetate, iso 1 part of glycidyl caprylic acid, 6 parts of borosilicate, 2 parts of Tween, 6 parts of trimethyl metasilicate, and 0.5 parts of sodium citrate in a wax remover solution to remove surface wax;

[0031] c. Degreasing: Soak the above-mentioned die-casting parts after dewaxing in alkaline cleaning agent for 30 minutes to remove surfac...

Embodiment 2

[0037] A method for surface treatment of an aluminum alloy die casting, comprising the steps of:

[0038] S1. Pretreatment of die castings:

[0039] a. Shot blasting treatment: Use stainless steel projectiles with a size of 0.25-0.4mm, at a projectile speed of 60m / s, to perform shot blasting treatment on the die-casting parts to remove the oxide skin on the surface of the die-casting parts; after the shot blasting, use ultrasonic equipment to It is ultrasonically cleaned;

[0040] b. Wax removal: Dip the die-casting parts with descaled surfaces into 12 parts of triethanolamine oleic acid soap, 2 parts of polyacrylamide, 2.5 parts of coconut oleic acid diethanolamide, 4 parts of tetrasodium edetate, iso 1 part of glycidyl caprylic acid, 6 parts of borosilicate, 3 parts of Tween, 4 parts of trimethyl metasilicate, and 1 part of sodium citrate in a wax remover solution to remove surface wax;

[0041] c. Degreasing: Soak the above-mentioned die-casting parts after dewaxing in al...

Embodiment 3

[0047] A method for surface treatment of an aluminum alloy die casting, comprising the steps of:

[0048] S1. Pretreatment of die castings:

[0049] a. Shot blasting treatment: Use stainless steel projectiles with a size of 0.25-0.4mm at a projectile speed of 55m / s to perform shot blasting treatment on the die-casting parts to remove the oxide skin on the surface of the die-casting parts; It is ultrasonically cleaned;

[0050]b. Waxing removal: Dip the die-casting parts with descaled surfaces into 15 parts of triethanolamine oleic acid soap, 1 part of polyacrylamide, 4 parts of coconut oleic acid diethanolamide, 3 parts of tetrasodium edetate, iso 2 parts of glycidyl caprylic acid, 5 parts of borosilicate, 6 parts of Tween, 1 part of trimethyl metasilicate, and 2.5 parts of sodium citrate in a wax remover solution to remove surface wax;

[0051] c. Degreasing: Soak the above-mentioned die-casting parts after wax removal in alkaline cleaning agent for 15 minutes to remove sur...

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Abstract

The invention relates to the technical field of die casting production, in particular to a surface treatment method for an aluminum alloy die casting. The surface treatment method includes the three steps of die casting pretreatment, chemical alloy solution treatment and electrostatic coating. The step of die casting pretreatment includes the procedures of shot blasting treatment, wax removal, deoiling, grinding treatment, three times of washing and the like. The surface treatment method for the aluminum alloy die casting is high in work efficiency and good in treatment effect; and the obtained surface-treated die casting is uniform, fine and smooth in texture, high in strength and good in corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of die casting production, in particular to a method for surface treatment of aluminum alloy die castings and the obtained product. Background technique [0002] Die casting is a metal casting process that uses a mold cavity to apply high pressure to molten metal for casting. Die-casting is suitable for manufacturing a large number of small and medium-sized castings. Compared with other casting technologies, the metal surface of die-casting molded workpieces is smoother and has a high degree of dimensional consistency, so it has become the most widely used in various casting processes. With the rapid progress and development of science and technology, modern technology products are required to have fashionable appearance and rich texture while pursuing rich functions. As a widely used forming technology, die casting is widely used in the production of various complex components, and it also has the advantag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/48C23C18/18C23G5/036B05D7/14
CPCB05D7/14B05D2202/25B05D2506/20C23C18/1806C23C18/1837C23C18/48C23G5/036
Inventor 黄远霞
Owner HANSHAN ZHAOXIA CASTING
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