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A kind of surface treatment method of zinc alloy die casting

A surface treatment and die-casting technology, which is applied in the field of zinc alloy die-casting surface treatment, can solve problems such as poor bonding force, difficult electroplating, complicated electroplating process, etc., and achieve the effect of simple operation and dense alloy layer

Active Publication Date: 2016-04-13
GUANGZHOU HONWAY TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, compared with other substrates, the electroplating process of zinc alloy die castings is complicated, especially the cyanide-free electroplating on zinc alloy die castings is more difficult, and the bonding force is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A method for surface treatment of zinc alloy die castings, comprising the steps of:

[0046] (1) Wax removal of zinc alloy die-casting blanks: Soak the zinc alloy die-casting blanks in the BH-20 wax remover solution of Guangzhou Erqing Research Institute at 80°C and a concentration of 30ml / L for 12 minutes to remove the zinc alloy die-castings Wax on the surface of the blank to obtain a zinc alloy die-casting after wax removal.

[0047] (2) Water washing: wash the zinc alloy die-casting parts after wax removal in step (1) three times at 20°C to remove the residual wax remover solution on the surface.

[0048] (3) Chemical degreasing: The zinc alloy die-casting parts cleaned in step (2) are immersed in a degreasing agent solution at 40°C for 12 minutes to remove the grease on the surface of the zinc alloy die-casting parts to obtain the degreasing zinc alloy die-casting parts The concentration of trisodium phosphate in the degreaser solution is 30g / L, the concentration ...

Embodiment 2

[0098] A method for surface treatment of zinc alloy die castings, comprising the steps of:

[0099] (1) Wax removal of zinc alloy die-casting blanks: Soak the zinc alloy die-casting blanks in the BH-20 wax remover solution of Guangzhou Erqing Research Institute at 75°C and a concentration of 50ml / L for 20 minutes to remove the zinc alloy die-castings Wax on the surface of the blank to obtain a zinc alloy die-casting after wax removal.

[0100] (2) Water washing: Wash the zinc alloy die-casting parts after wax removal in step (1) three times at 35°C to remove the residual wax remover solution on the surface.

[0101] (3) Chemical degreasing: The zinc alloy die-casting parts cleaned in step (2) are immersed in a degreasing agent solution at 35°C for 20 minutes to remove the grease on the surface of the zinc alloy die-casting parts to obtain the degreasing zinc alloy die-casting parts The concentration of trisodium phosphate in the degreaser solution is 30g / L, the concentration ...

Embodiment 3

[0117] A method for surface treatment of zinc alloy die castings, comprising the steps of:

[0118] (1) Wax removal of zinc alloy die-casting blanks: Soak zinc alloy die-casting blanks in BH-20 wax remover solution at 85°C with a concentration of 40ml / L Guangzhou Erqing Research Institute for 8 minutes to remove zinc alloy die-casting blanks Wax on the surface to obtain a zinc alloy die-casting after wax removal.

[0119] (2) Water washing: Wash the zinc alloy die-casting parts after wax removal in step (1) three times at 30°C to remove the residual wax remover solution on the surface.

[0120] (3) Chemical degreasing: The zinc alloy die-casting parts cleaned in step (2) are soaked in a degreasing agent solution at 55°C for 8 minutes to remove the grease on the surface of the zinc alloy die-casting parts to obtain the degreasing zinc alloy die-casting parts The concentration of trisodium phosphate in the degreasing agent solution is 30g / L, the concentration of sodium carbonat...

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PUM

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Abstract

The invention discloses a method for surface treatment of zinc alloy die castings, which comprises the following steps: (1) removing wax from zinc alloy die casting blanks; (2) washing the zinc alloy die castings after wax removal; Soak the zinc alloy die-casting parts after water washing to remove the grease on the surface; (4) Water washing: water the zinc alloy die-casting parts after degreasing in the previous step; (5) Sulfuric acid activation: wash the zinc alloy die-casting parts in the previous step The die-casting parts are activated by immersing them in sulfuric acid solution; (6) Wash the zinc alloy die-casting parts activated in the previous step; (7) Soak the zinc alloy die-casting parts washed in the previous step in a cyanide-free solution to obtain Alloy layer; (8) Wash the zinc alloy die-casting after alloying in the previous step; (9) Subsequent electroplating or electroless plating. In the process method of the present invention, in the cyanide-free chemical alloy treatment, the solution used does not contain cyanide, no power supply is needed, no heating is required, the operation is simple, and the finally formed alloy layer is dense.

Description

technical field [0001] The invention relates to a surface treatment method of a zinc alloy die casting. Background technique [0002] Cyanide copper plating has long been used as a base copper plating process for zinc alloy die castings, but cyanide is highly toxic and poses a serious threat to operators and the environment, which makes cyanide copper plating contrary to clean production. Therefore, cyanide-free surface treatment process is The direction of future development. [0003] The cyanide-free process technology is the product of the national clean production development requirements. It has largely eliminated the harm to the operators and the environment caused by cyanide copper plating. Much progress has been made with little effort. [0004] However, compared with other substrates, the electroplating process of zinc alloy die castings is complicated, especially the cyanide-free electroplating on zinc alloy die castings is more difficult and the bonding force is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F17/00C23G1/00C23C18/30C23C18/38C25D3/00
Inventor 徐金来赵国鹏胡耀红周杰
Owner GUANGZHOU HONWAY TECH CORP