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Method for barrel-plating zinc-nickel alloy on automobile part

An auto parts, zinc-nickel technology, applied in the field of auto parts surface processing, can solve the problems of uneven coating, affecting product appearance and performance, and the content of zinc and nickel cannot be guaranteed to be consistent, etc., to achieve good dispersion ability, guaranteed performance, and coating thickness. Evenly distributed effect

Inactive Publication Date: 2017-11-24
南通创源电化学科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among them, in order to better protect the product in barrel plating, galvanized nickel is often plated on it. The current process of barrel plating zinc-nickel alloy for auto parts is hot alkali degreasing→primary anode electrolysis→pickling→secondary anode electrolysis→activation→middle And → barrel zinc-nickel plating → dehydrogenation → passivation → sealing, in this process, due to the one-time electroplating of zinc-nickel barrel plating, the content of zinc and nickel in the electroplating solution cannot be guaranteed to be consistent, resulting in uneven plating, which in turn affects the appearance of the product and performance

Method used

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  • Method for barrel-plating zinc-nickel alloy on automobile part

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The method for barrel-plating zinc-nickel alloy of the present embodiment cap nut may further comprise the steps:

[0050] (1) Hot alkali degreasing: put the cap nut in the solution of the following components for hot alkali degreasing:

[0051] Sodium hydroxide 50g / L

[0052] Sodium Phosphate 25 g / L

[0053] Trisodium Phosphate 25 g / L

[0054] Sodium silicate 10 g / L

[0055] water balance

[0056] The hot alkali degreasing conditions are: temperature 65°C, time 15min.

[0057] Rinse with running water at about 50°C for 5s after hot alkali degreasing, and then rinse with running water at about 20°C for 5s;

[0058] (2) Primary anode electrolysis: place the cap nuts degreased by hot alkali in step (1) in the solution of the following components for anodic electrolysis:

[0059] HMC-02A degreasing powder 60g / L

[0060] HMC-02B Degreaser 6ml / L

[0061] water balance

[0062] Anode electrolysis conditions are: temperature 50°C, current density 1.0A / dm 2 , time 6mi...

Embodiment 2

[0092] The method for barrel-plating zinc-nickel alloy of the present embodiment cap nut may further comprise the steps:

[0093] (1) Hot alkali degreasing: put the cap nut in the solution of the following components for hot alkali degreasing:

[0094] Sodium hydroxide 100g / L

[0095] Sodium Phosphate 50 g / L

[0096] Trisodium Phosphate 35 g / L

[0097] Sodium silicate 15 g / L

[0098] water balance

[0099] The hot alkali degreasing conditions are: temperature 75°C, time 6min.

[0100] Rinse with running water at about 50°C for 20s after hot alkali degreasing, and then rinse with running water at about 20°C for 20s;

[0101] (2) Primary anode electrolysis: place the cap nuts degreased by hot alkali in step (1) in the solution of the following components for anodic electrolysis:

[0102] HMC-02A degreasing powder 80g / L

[0103] HMC-02B degreaser 10ml / L

[0104] water balance

[0105] Anode electrolysis conditions are: temperature 70°C, current density 5.0A / dm 2 , time ...

Embodiment 3

[0135] The method for barrel-plating zinc-nickel alloy of the present embodiment cap nut may further comprise the steps:

[0136] (1) Hot alkali degreasing: put the cap nut in the solution of the following components for hot alkali degreasing:

[0137] Sodium hydroxide 75g / L

[0138] Sodium Phosphate 38 g / L

[0139] Trisodium Phosphate 30 g / L

[0140] Sodium silicate 12 g / L

[0141] water balance

[0142] The hot alkali degreasing conditions are: temperature 70°C, time 10minn.

[0143] After hot alkali degreasing, rinse with running water at about 50°C for 12s, and then rinse with running water at about 20°C for 12s;

[0144] (2) Primary anode electrolysis: place the cap nuts degreased by hot alkali in step (1) in the solution of the following components for anodic electrolysis:

[0145] HMC-02A degreasing powder 70g / L

[0146] HMC-02B Degreaser 8ml / L

[0147]water balance

[0148] Anode electrolysis conditions are: temperature 60°C, current density 4.0A / dm 2 , time ...

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Abstract

The invention relates to a method for barrel-plating a zinc-nickel alloy on an automobile part. The method comprises the following steps of (1) hot alkali degreasing, (2) anodic electrolyzing for the first time, (3) acid pickling, (4) anodic electrolyzing for the second time, (5) activating, (6) neutralizing, (7) two-stage zinc-nickel barrel-plating, (8) dehydrogenation, (9) passivating, and (10) closing. The method for barrel-plating the zinc-nickel alloy on the automobile part has the advantages that zinc-nickel barrel-plating is conducted for two times instead of one time, a plating tank in the first stage contains more zinc and less nickel, a plating tank in the second stage contains less zinc and more nickel, the zinc contents and the nickel contents in the plating tanks in the two stages are adjusted to be the same, so that the zinc content and the nickel content of a product are guaranteed, thus, the uniformity of a plating layer is guaranteed, accordingly the appearance of the product can be effectively controlled, and the performance of the product is greatly guaranteed.

Description

technical field [0001] The invention belongs to the field of surface processing of auto parts, in particular to a method for barrel plating zinc-nickel alloy of auto parts. Background technique [0002] In the production process of auto parts, it is often necessary to plate a thin layer of metal on its surface to improve the anti-corrosion effect of auto parts, as well as the wear resistance, conductivity, reflectiveness and aesthetics of auto parts. Electroplating is usually divided into rack plating, barrel plating, continuous plating and brush plating, which are mainly related to the size and batch size of the parts to be plated. Rack plating is suitable for general-sized products, such as car bumpers, bicycle handlebars, etc. Barrel plating is suitable for small parts such as fasteners, washers, pins, etc. [0003] Among them, in order to better protect the product in barrel plating, galvanized nickel is often plated on it. The current process of barrel plating zinc-ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D5/10C25D5/34
CPCC25D5/10C25D3/565C25D5/34
Inventor 沈宇东永华
Owner 南通创源电化学科技有限公司
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