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Silver plating black oxidation treatment method

A blackening and pretreatment technology, applied in anodizing and other directions, can solve the problems of difficult realization of industrial production, obstacles to market-oriented production, low energy utilization rate, etc., and achieve the effect of smooth surface, improved appearance and performance, and optimized appearance.

Active Publication Date: 2018-03-06
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the previous blackening processes used ammonium polysulfide as the main blackening agent. Zhu Haigang and Zhu Jianlin did research in the article "Electroplating and Finishing", 12-13, 29, 2010, Research on Blackening Process of Electroplating Silver, but there is a blackening temperature High, long blackening time, low energy utilization rate, the disadvantages that industrial production is difficult to realize, and the long blackening speed hinders market production

Method used

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  • Silver plating black oxidation treatment method

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Embodiment 1

[0015] In the blackening process, the cathode is made of stainless steel, the anode is the silver-plated piece, the content of the main blackening agent sodium hypochlorite is 5.0 g / L, the auxiliary blackening agent sodium perchlorate is 0.5 g / L, and the additive is polyethylene glycol 0.01 g / L, ethanol 2.5 g / L, acetone 1.0 g / L, surfactant triton content 0.5 g / L, blackening solution pH 2.0, current density 2.0 A / dm 2 , the blackening time is 5.0 min, and the blackening temperature is 60 ℃.

Embodiment 2

[0017] In the blackening process, the cathode is made of stainless steel, and the anode is the plated piece after the silver plating. The content of the main blackening agent sodium hypochlorite is 0.2 g / L, the auxiliary blackening agent sodium perchlorate is 0.01 g / L, and the additive polyethylene glycol is 1.0 g / L. g / L, ethanol 1.0 g / L, acetone 1.0 g / L, surfactant triton content 0.5 g / L, blackening solution pH 5.0, current density 1.0 A / dm 2 , the blackening time is 1.5 min, and the blackening temperature is 50 ℃.

Embodiment 3

[0019] In the blackening process, the cathode is made of stainless steel, the anode is the plated piece after the silver plating, the content of the main blackening agent sodium hypochlorite is 1.0 g / L, the auxiliary blackening agent sodium perchlorate is 0.5 g / L, and the additive polyethylene glycol 2.5 g / L, ethanol 1.0 g / L, acetone 1.0 g / L, surfactant triton content 0.5 g / L, blackening solution pH 4.0, current density 1.0 A / dm 2 , the blackening time is 1.5 min, and the blackening temperature is 50 ℃.

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Abstract

The invention provides a silver plating black oxidation treatment method, and belongs to the field of electroplating and surface treatment, wherein through the method, a silver plating layer gains stable chemical properties and is resistant to corrosion, a plating piece or sample after silver plating black oxidation has a more jet-black color, large-area uniformity is guaranteed, and stability andservice life of the plating piece are improved. The method comprises the following steps: pretreating a substrate material; performing silver electroplating on the pretreated substrate material; finally, performing black oxidation treatment on the plating piece after the silver plating, wherein a black oxidation solution comprises a main black oxidation agent, an assistant black oxidation agent,a surfactant, a black oxidation additive and a pH regulator; the pH value of the black oxidation solution is 2.0 to 8.0; the operation conditions are as follows: in black oxidation, stainless steel ortitanium basket inert material is adopted for a negative pole, a positive pole is the plating piece after silver plating, the electroplating power is in a constant-current mode, the current density is 0.2-2.0A / dm<2>, and the black oxidation time is 0.5-5min; the working temperature is 30-60 DEG C.

Description

technical field [0001] The invention belongs to the field of electroplating and surface engineering, in particular to a method for blackening silver plating. Background technique [0002] Silver plating process is widely used in manufacturing industries such as electrical appliances, instruments, meters and lighting appliances. Silver plating can prevent corrosion, increase conductivity, reflect light and look beautiful. However, the coating of silver-plated parts is unstable and is very sensitive to sulfide in the air. Even a small amount of sulfur will discolor the silver, resulting in unstable coatings, and the thermal and electrical conductivity of the coated parts will decline accordingly. Therefore, in order to improve the stability of the coating Sex, usually after plating treatment. [0003] Silver plating has better corrosion resistance after blackening, and is pure black and bright, with uniform and beautiful tones, and meets the modern industry's requirements for...

Claims

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Application Information

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IPC IPC(8): C25D5/48C25D11/34
CPCC25D5/48C25D11/34
Inventor 赵健伟程娜孙志
Owner JIAXING UNIV
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