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Zinc or zinc alloy electroplating method and system

A zinc alloy and electroplating bath technology, applied in the field of zinc or zinc alloy electroplating and systems, can solve problems such as inability to prolong the service life of the plating solution

Inactive Publication Date: 2019-11-15
DIPSOL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is understood that the service life of the plating solution cannot be extended substantially.

Method used

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  • Zinc or zinc alloy electroplating method and system
  • Zinc or zinc alloy electroplating method and system
  • Zinc or zinc alloy electroplating method and system

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0082] An anode plate (surface roughness Ra: 4 μm, 64×64×2 mm) coated with tantalum oxide on Ni with a thickness of 0.5 to 0.8 μm was used, and an alkaline zinc-nickel alloy plating bath (500 mL ), using 500Ah / L energization to implement zinc-nickel alloy plating. The pore diameter in the coating film was 0.1 to 1 μm, and the dipping out of the plating bath was 2 mL / Ah. The cathode current density is 4A / dm 2 , the anode current density is 9.8A / dm 2 , the plating bath temperature is 25°C. The bath was cooled and maintained at 25°C. An iron plate is used for the cathode. It should be noted that the iron plate of the cathode was replaced every 16Ah / L during energization. The concentration of zinc ions in the plating bath is maintained constant by dipping and dissolving metallic zinc. The concentration of nickel ions in the plating bath was kept constant by supplying nickel replenisher IZ-250YNi (manufactured by DIPSOL). The sodium hydroxide concentration of the plating bat...

Embodiment 2

[0091] An anode plate (surface roughness Ra: 4 μm, 64×64×2 mm) coated with tantalum oxide on Fe with a thickness of 0.5 to 0.8 μm was used, and an alkaline zinc-nickel alloy plating bath (500 mL ), using 500Ah / L energization to implement zinc-nickel alloy plating. The pore diameter in the coating film was 0.1 to 1 μm, and the dipping out of the plating bath was 2 mL / Ah. The cathode current density is 4A / dm 2 , the anode current density is 9.8A / dm 2 , the plating bath temperature is 25°C. The bath was cooled and maintained at 25°C. An iron plate is used for the cathode. It should be noted that the iron plate of the cathode was replaced every 16Ah / L during energization. The concentration of zinc ions in the plating bath is maintained constant by dipping and dissolving metal zinc. The concentration of nickel ions in the plating bath was kept constant by supplying nickel replenisher IZ-250YNi (manufactured by DIPSOL). The sodium hydroxide concentration of the plating bath i...

Embodiment 3

[0099] An anode plate (surface roughness Ra: 4 μm, 64×64×2 mm) coated with tantalum oxide on Ni with a thickness of 0.5 to 0.8 μm was used, and an alkaline zinc-nickel alloy plating bath (500 mL ), using 500Ah / L energization to implement zinc-nickel alloy plating. The pore diameter in the coating film was 0.1 to 1 μm, and the dipping out of the plating bath was 2 mL / Ah. The cathode current density is 2A / dm 2 , the anode current density is 4.9A / dm 2 , the plating bath temperature is 25°C. The bath was cooled and maintained at 25°C. An iron plate is used for the cathode. It should be noted that the iron plate of the cathode was replaced every 16Ah / L during energization. The concentration of zinc ions in the plating bath is maintained constant by dipping and dissolving metal zinc. The concentration of nickel ions in the plating bath was kept constant by supplying nickel replenisher IZ-250YNi (manufactured by DIPSOL). The sodium hydroxide concentration of the plating bath i...

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Abstract

The invention provides a zinc or zinc alloy electroplating method. The zinc or zinc alloy electroplating method comprises the step of electrifying in an alkaline zinc or zinc alloy electroplating bathwith a cathode and an anode, wherein the anode is an anode formed by applying an alkali-resistant ceramic on a conductive substrate in an energizable state, and the alkaline zinc or zinc alloy electroplating bath is an alkaline zinc plating bath containing an organic compound additive, or an alkaline zinc alloy electroplating bath containing an amine chelating agent and an organic compound additive; the oxidative decomposition of an organic compound additive in an alkaline zinc plating bath or an amine-based chelating agent and an organic compound additive in an alkaline zinc alloy plating bath on the surface of the anode due to energization is suppressed as compared to when the same conductive substrate not coated with an alkali-resistant ceramic is used as the anode.

Description

technical field [0001] The present invention relates to zinc or zinc alloy electroplating methods and systems. Specifically, it relates to the use of alkaline zinc or zinc alloy electroplating bath to perform zinc or zinc alloy electroplating excellent in corrosion resistance on steel parts, etc. An anode of permanent ceramics, an electroplating method and system capable of long-term use while maintaining the performance of the plating bath. Background technique [0002] Zinc plating is used as an inexpensive rust-preventive plating containing almost no organic compounds using a bath containing cyanide. However, in recent years, zinc plating baths that do not use highly toxic cyanides have been studied, and zinc plating baths containing organic compounds such as quaternary ammonium polymers have begun to spread. However, when this organic compound is decomposed and lost by anodic oxidation, dendrites having poor adhesion are precipitated, and good antirust zinc plating can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/22C25D3/56C25D17/10
CPCC25D3/22C25D3/565C25D17/10
Inventor 新鞍俊宽桥本章井上学
Owner DIPSOL CO LTD
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