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Process for improving plating thickness of zinc-nickel-plated low area

A coating thickness, zinc-nickel technology, applied in metal material coating process, coating, sputtering and other directions, can solve the problems of large thickness deviation in the high and low areas of the product, rough 84 plating, easy to powder, etc. Improve complexing ability, improve corrosion resistance, uniform and smooth thickness

Active Publication Date: 2019-03-01
NINGBO YADA METAL SURFACE TREATMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, due to the improvement of product quality in the current barrel zinc-nickel plating process (copper leakage at the bottom of the lining core in the low area, easy powder formation during crimping, rough 84 plating, and large thickness deviation in the high and low areas of the product), there is an urgent need to develop new chemical solutions and new process technologies

Method used

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  • Process for improving plating thickness of zinc-nickel-plated low area

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Pre-treatment: The alloy workpiece is degreased, hot water washed, rust removed, and cold washed in sequence. First, the alloy workpiece is tilted 20°, and superheated steam is continuously sprayed upward from the bottom of the workpiece for 30 seconds, then immersed in cold water at -2°C and circulated. Steam blowing, cold water immersion 3 times, and then soak the alloy workpiece with activator, wherein the activator includes hydrogen fluoride 45g / L, sodium fluoroborate 45g / L, perchloric acid 5g / L, ascorbic acid 4g / L, silicon carbide particles 50g / L, for physical and chemical compound activation treatment;

[0032] Membrane production: First, vapor-deposit metal magnesium on the activated alloy workpiece, put the alloy workpiece in hot water, boil, control the boiling time to 4min, take it out, dry it and immerse it in a sodium silicate solution containing 35g / L, set The temperature is 75°C, the pH is adjusted to 8, and the control time is 15 minutes to carry out seal...

Embodiment 2

[0035] Pretreatment: Carry out oil removal, hot water washing, rust removal, and cold water washing treatment on the alloy workpiece in sequence. First, the alloy workpiece is tilted 10°, and superheated steam is continuously sprayed upward from the bottom of the workpiece for 20 seconds, then immersed in -4 ℃ cold water, and circulated. Steam blowing and cold water immersion are performed twice, and then the alloy workpiece is soaked in an activator, where the activator includes 30g / L hydrogen fluoride, 40g / L sodium fluoroborate, 4g / L perchloric acid, 3g / L ascorbic acid, silicon carbide particles 40g / L, physical and chemical combined activation treatment;

[0036]Membrane production: First, vapor-deposit metal magnesium on the activated alloy workpiece, put the alloy workpiece in hot water, boil, control the boiling time to 4min, take it out, dry it and immerse it in a sodium silicate solution containing 35g / L, set The temperature is 75°C, the pH is adjusted to 8, and the con...

Embodiment 3

[0039] Pre-treatment: The alloy workpiece is degreased, hot water washed, rust removed, and cold washed in sequence. First, the alloy workpiece is tilted 30°, and superheated steam is continuously sprayed upward from the bottom of the workpiece for 40 seconds, then immersed in cold water at 0°C, and the steam is circulated. Spraying and soaking in cold water for 4 times, and then soak the alloy workpiece with activator, wherein the activator includes hydrogen fluoride 60g / L, sodium fluoroborate 50g / L, perchloric acid 6g / L, ascorbic acid 5g / L, silicon carbide particles 60g / L, for physical and chemical compound activation treatment;

[0040] Membrane production: First, vapor-deposit metal magnesium on the activated alloy workpiece, put the alloy workpiece in hot water, boil, control the boiling time to 4min, take it out, dry it and immerse it in a sodium silicate solution containing 35g / L, set The temperature is 75°C, the pH is adjusted to 8, and the control time is 15 minutes ...

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Abstract

The invention belongs to the technical field of metal surface treatment, and particularly relates to a process for improving the plating thickness of a zinc-nickel-plated low area. The process comprises the following steps: pre-treatment, specifically, an alloy workpiece is subjected to de-oiling, hot washing, derusting and cold washing treatment in sequence, and then is subjected to physical activation and chemical activation in sequence; film formation, specifically, magnesium metal is evaporated on the activated alloy workpiece, sealing treatment is carried out, and then the workpiece is immersed in electrolyte for electroplating treatment to obtain a film-coated workpiece; and post-treatment, specifically, the film-coated workpiece is rinsed with clean water, leached with cold water, and dried to obtain the finished alloy workpiece. By using the magnesium metal as a pre-plating, the weight of the plating is greatly reduced, and through simple boiling water sealing and sodium silicate heat sealing treatment, the inertness of the magnesium plating and the corrosion resistance of the plating are improved.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a process for increasing the thickness of a galvanized-nickel low-area coating. Background technique [0002] Science and technology drive the continuous development of society and scientific research. From high-end aerospace and military industries to people's basic necessities of life, all reflect the progress of science and technology. The continuous innovation of transportation means has greatly shortened the distance between them. As the main means of transportation at present, the material composition of the automobile determines the performance of the structure, and the surface treatment process greatly affects the appearance and service life. [0003] The structural materials and exterior decoration materials of automobiles are generally alloy steel or aluminum alloy, and with the development of lightweight automobiles, the use of more and mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D5/34C25D5/48C23C14/24C23C14/16C23C14/02C23C28/02
CPCC23C14/02C23C14/16C23C14/24C23C28/021C23C28/025C25D3/565C25D5/34C25D5/48
Inventor 董阿能陈前山秦利军
Owner NINGBO YADA METAL SURFACE TREATMENT
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