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Process for electroplating zinc-nickel alloy on part with spinning surface

A technology of zinc-nickel electroplating and alloy process, which is applied in the field of electroplating zinc-nickel alloy process of parts with spinning surface, which can solve the problems of poor appearance and cracking of electroplating layer, and achieve the effect of not easy cracking and mild process conditions

Pending Publication Date: 2021-04-06
NANTONG SHENHAI SCI & IND TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some electroplating zinc-nickel alloy processes now have problems such as poor appearance after electroplating and cracking of the electroplating layer after spinning when targeting parts that require spinning after electroplating or have a spinning surface structure. Further improvements to address the above issues

Method used

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  • Process for electroplating zinc-nickel alloy on part with spinning surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A process for electroplating zinc-nickel alloy parts with spinning surfaces, comprising the following steps:

[0020] S1. Off-line pre-treatment: put the parts to be plated into the degreasing tank for chemical degreasing treatment, the concentration of degreasing powder used in the chemical degreasing is 70g / L, the degreasing temperature is 55°C, and the degreasing time is 6min; After washing with water, the parts to be plated are immersed in a mixed acid tank for pickling, and the pickling time is 30s. The mixed acid in the mixed acid tank is a mixed solution of concentrated hydrochloric acid and concentrated sulfuric acid. In this way, the oxide skin on the surface of the blank can be better removed, and a coating with better bonding force can be obtained.

[0021] S2, one-time hot alkali degreasing: send the parts to be plated after chemical degreasing into the hot alkali degreasing pool for one hot alkali degreasing, and the concentration of the alkaline degreasin...

Embodiment 2

[0031] A process for electroplating zinc-nickel alloy parts with spinning surfaces, comprising the following steps:

[0032] S1. Off-line pre-treatment: Put the parts to be plated into the degreasing tank for chemical degreasing treatment. The concentration of degreasing powder used in the chemical degreasing is 100g / L, the degreasing temperature is 65°C, and the degreasing time is 8min; Then immerse the parts to be plated in a mixed acid tank for pickling after being washed with water, and the pickling time is 100s; the mixed acid in the mixed acid tank is a mixed solution of concentrated hydrochloric acid and concentrated sulfuric acid.

[0033] S2, one-time hot alkali degreasing: send the parts to be plated after chemical degreasing into the hot alkali degreasing pool for one hot alkali degreasing, and the concentration of the alkaline degreasing solution used for the first hot alkali degreasing is 100g / L, The degreasing temperature is 65° C., and the degreasing time is 10 ...

Embodiment 3

[0042] A process for electroplating zinc-nickel alloy parts with spinning surfaces, comprising the following steps:

[0043] S1. Off-line pre-treatment: Put the parts to be plated into the degreasing tank for chemical degreasing treatment. The concentration of degreasing powder used in the chemical degreasing is 85g / L, the degreasing temperature is 60°C, and the degreasing time is 7min; After washing with water, the parts to be plated are immersed in a mixed acid tank for pickling, and the pickling time is 65 s; the mixed acid in the mixed acid tank is a mixed solution of concentrated hydrochloric acid and concentrated sulfuric acid.

[0044] S2, one-time hot alkali degreasing: send the parts to be plated after chemical degreasing into the hot alkali degreasing pool for one hot alkali degreasing, and the concentration of the alkaline degreasing solution used for the first hot alkali degreasing is 85g / L, The degreasing temperature is 60° C., and the degreasing time is 7 minutes...

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Abstract

The invention provides a process for electroplating a zinc-nickel alloy on a part with a spinning surface. The process comprises the following steps: S1, off-line pretreatment; S2, primary hot alkali oil removal; S3, primary anode electrolytic degreasing; S4, acid pickling; S5, secondary anode electrolytic degreasing; S6, activation; S7, presoaking; and S8, electroplating. According to the process, chemical oil removal, two times of hot alkali oil removal and two times of anode electrolytic oil removal are carried out, and compared with single use of hot alkali oil removal and electrolytic oil removal, the process conditions are mild, and an electroplated layer on the spinning surface is not prone to cracking. The spinning surface is free of red embroidery for 480 hours in a neutral salt spray test, and the non-spinning part is free of red embroidery for 720 hours.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a zinc-nickel alloy electroplating process for parts with spinning surfaces. Background technique [0002] In the electroplating industry, zinc-nickel alloys have good wear resistance, can resist various acid corrosion and stress corrosion, etc., so zinc-nickel alloys have been widely used. However, some electroplating zinc-nickel alloy processes now have problems such as poor appearance after electroplating and cracking of the electroplating layer after spinning when targeting parts with spinning requirements or spinning surface structures after electroplating. Further improvements are made to address the above issues. Contents of the invention [0003] In order to solve the above-mentioned defects, the object of the present invention is to provide a zinc-nickel alloy electroplating process for parts with spinning surfaces, so as to solve the problems raised in the abo...

Claims

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Application Information

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IPC IPC(8): C25D3/56C25D5/34
CPCC25D3/565C25D5/34
Inventor 孙祥宇
Owner NANTONG SHENHAI SCI & IND TECHCO