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Cyanogen-free imitation gold electroplating liquid and magnesium alloy electroplating technology thereof

An electroplating process and electroplating solution technology, applied in the field of metal surface electroplating, can solve the problems of poor adhesion of electroplating imitation gold coatings and high activity of magnesium alloys, and achieve the effects of short electroplating time, wide electrochemical window, and maintenance cost saving

Active Publication Date: 2019-12-20
广西南宁诚格五金制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of high activity of magnesium alloys existing in the prior art, it is difficult to electroplate imitation gold coating on the surface and the problem of poor bonding force, the present invention is to provide a cyanide-free imitation gold electroplating solution and its magnesium alloy electroplating process, the obtained imitation gold plating Gold plating provides excellent tarnish resistance without passivation

Method used

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  • Cyanogen-free imitation gold electroplating liquid and magnesium alloy electroplating technology thereof
  • Cyanogen-free imitation gold electroplating liquid and magnesium alloy electroplating technology thereof

Examples

Experimental program
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Embodiment 1

[0033] The cyanide-free imitation gold electroplating solution of the present embodiment comprises the following components in every liter of electroplating solution: potassium pyrophosphate (K 4 P 2 o 7 ·3H 2 O) 240g / L, copper pyrophosphate (Cu 2 P 2 o 7 ) 20g / L, stannous pyrophosphate (Sn 2 P 2 o 7 ) 2.0g / L, zinc sulfate (ZnSO 4 ·7H 2 O) 40g / L, hydroxyethylidene diphosphonic acid (HEDP) 20g / L, AESS (fatty alcohol polyoxyethylene ether sulfosuccinic acid monoester disodium salt) 2mL / L and imidazole ionic liquid ([OMIM]HSO 4 ) 3mol / L, the solvent is water; the pH of the electroplating solution is adjusted to 8.5 by potassium pyrophosphate and potassium hydroxide.

[0034] The process steps of electroplating a cyanide-free imitation gold electroplating coating on the surface of magnesium alloy are as follows:

[0035] (1) Polish it, then undergo ultrasonic degreasing, pickling and activation treatment in sequence, degreasing agent: sodium hydroxide NaOH: 20g / L; sodiu...

Embodiment 2

[0040] The cyanide-free imitation gold electroplating solution of the present embodiment comprises the following components in every liter of electroplating solution: potassium pyrophosphate (K 4 P 2 o 7 ·3H 2 O) 300g / L, copper pyrophosphate (Cu 2 P 2 o 7 ) 24g / L, stannous pyrophosphate (Sn 2 P 2 o 7 ) 1.5g / L, zinc sulfate (ZnSO 4 ·7H 2 O) 50g / L, hydroxyethylidene diphosphonic acid (HEDP) 15g / L, AESS (fatty alcohol polyoxyethylene ether sulfosuccinic acid monoester disodium salt) 3mL / L and imidazole ionic liquid ([OMIM]HSO 4 ) 2mol / L, the solvent is water; the pH of the electroplating solution is adjusted to be 8 by potassium pyrophosphate and potassium hydroxide.

[0041] The process steps of electroplating a cyanide-free imitation gold electroplating coating on the surface of magnesium alloy are as follows:

[0042] (1) Polish it, then undergo ultrasonic degreasing, pickling and activation treatment in sequence, degreasing agent: sodium hydroxide (NaOH): 25g / L; so...

Embodiment 3

[0046] Cyanide-free imitation gold electroplating solution is identical with embodiment 1.

[0047] The process steps of the cyanide-free imitation gold electroplating coating on the magnesium alloy surface are basically the same as in Example 1, and the difference is that: after the galvanizing treatment of step (2), there is an extra step of bright copper plating, according to potassium pyrophosphate ( K 4 P 2 o 7 ) 200g / L, copper pyrophosphate (Cu 2 P 2 o 7 4H 2 (2) 50g / L, ammoniacal liquor 3mg / L, polyethylene glycol 10000 1g / L, be mixed with aqueous solution, regulate pH and be 8.5, obtain bright copper plating solution; Stir, room temperature, current density 0.8A / dm 2 Conditions for 6 minutes. The appearance of the imitation gold coating obtained in this embodiment is consistent with that of Example 1, and the appearance quality of the coating is good.

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Abstract

The invention belongs to the technical field of metal surface electroplating, and relates to a cyanogen-free imitation gold electroplating liquid and a magnesium alloy electroplating technology thereof. The electroplating liquid comprises 200-300 g / L of potassium pyrophosphate, 18-24 g / L of cupric pyrophosphate, 1.5-2.6 g / L of stannous pyrophosphate, 40-50 g / L of zinc sulfate, 15-20 g / L of HEDP, 2-3 mL / L of AESS and 1-3 mol / L of imidazolium ionic liquid, and pH is 8-9. The electroplating technology comprises the steps that firstly, a magnesium alloy sample is sequentially subjected to oil removal, acid pickling and activation treatment; secondly, then, primary zinc immersion, zinc return and secondary zinc immersion treatment are conducted; and thirdly, the magnesium alloy sample obtainedafter zinc immersion treatment is electroplated for 10-180 s at the room temperature under the current density of 0.1-2A / dm<2>, and cleaning and dry blowing are conducted. The imitation gold electroplating liquid is friendly to the environment and good in stability; and an imitation gold electroplated layer obtained on the surface of a magnesium alloy through electroplating is high in quality, andthe color changing resisting performance is good.

Description

technical field [0001] The invention belongs to the technical field of metal surface electroplating, and in particular relates to a cyanide-free imitation gold electroplating solution and a magnesium alloy electroplating process thereof. Background technique [0002] In Europe, Volkswagen has used magnesium alloy AZ91D to manufacture transmission housings to reduce weight. General Motors also uses magnesium alloys. Changan Automobile uses magnesium alloys for steering wheel frames, cylinder covers, oil pans, gearbox housings, Clutch housing, spare tire frame, wheel shell and seat frame, etc. China FAW also uses magnesium alloys in steering wheel frames, cylinder covers, etc. However, magnesium alloy is too active, and the standard electrode potential is very low (-2.36V). To apply magnesium alloy to different occasions, it is necessary to change its surface state to improve corrosion resistance, wear resistance, electrical conductivity, weldability, decoration and other pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/66C25D5/42C25D5/10C25D3/38
CPCC25D3/38C25D3/665C25D5/10C25D5/42
Inventor 郑丽郑升权罗松林修洲何刚
Owner 广西南宁诚格五金制品有限公司
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