Cyanogen-free silver-plating brightener and method for preparing the same

A brightener and silver light technology, applied in the field of electrodeposition, can solve the problems of weak substrate bonding, dull silver plating, high brittleness, etc., and achieve the effects of strong bonding, smooth surface, and fine crystallization

Inactive Publication Date: 2009-06-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a cyanide-free electroplating silver brightener for the problems that the silver-plated layer obtained after adding a brightener in the cyanide-free silver-plating solution is not bright, easy to change color, brittle, and has a weak bond with the substrate. its preparation method

Method used

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Effect test

specific Embodiment approach 1

[0006] Specific embodiment one: the cyanide-free silver plating brightener of the present embodiment is made of 0.1~1mol / L piperonal, 0.1~2mol / L sodium bisulfite, 0.1~2mol / L triethanolamine, 0.1~1mol / L butyne di made of alcohol. Wherein the solvent is any solvent that can make the above four components miscible, such as water, or a mixed solution of ethanol and water.

[0007] The butynediol in this embodiment may be one or a mixture of 1,4-butynediol, propoxylated butynediol, and ethoxylated butynediol.

[0008] The cyanide-free silver plating brightener of this embodiment is suitable for a cyanide-free silver plating solution system, especially suitable for a hydantoin-silver nitrate system cyanide-free silver plating solution. Improvements made by those skilled in the art based on the above principles should fall within the scope of protection of the present invention.

specific Embodiment approach 2

[0009] Specific embodiment two: the cyanide-free silver plating brightener of the present embodiment is made of 0.1mol / L piperonal, 0.5mol / L sodium bisulfite, 1mol / L triethanolamine, 0.5mol / L1,4-butynediol, Made with 0.5mol / L propoxybutynediol.

specific Embodiment approach 3

[0010] Embodiment 3: The brightener in this embodiment is made of 0.1 mol / L piperonal, 0.2 mol / L sodium bisulfite, 2 mol / L triethanolamine, and 1 mol / L 1,4-butynediol.

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Abstract

The preparation method for cyan-free silver plating lustre-coating agent comprises: adding 0.1-1mol / L heliotropin into saturated 0.1-2mol / L NaHSO3 solution for ultrasonic oscillating; dissolving 0.1-2mol / L triethanolamine and 0.1-1mol / L butynediol into the solution, adding solvent to dilute to 1L. This invention overcomes the defects in prior art withnot sulfur-containing compound, and has well dispersion.

Description

technical field [0001] The invention belongs to the technical field of electrodeposition, and relates to a brightener for cyanide-free silver plating and a preparation process thereof, in particular to a brightener and a brightener used in a cyanide-free silver plating process with hydantoin-silver nitrate as the main component. Preparation Process. Background technique [0002] Silver is a malleable and malleable precious metal. Like gold, it is widely used in the decoration industry due to its low content in the earth's crust and its bright appearance. Decorative electroplating silver requires high bonding strength between the coating and the substrate, strong wear resistance, corrosion resistance and discoloration resistance, and a bright and delicate appearance. Alkaline cyanide bright electroplating silver plating system was the most widely used and researched bright silver plating system in the past, but with the enhancement of people's environmental protection awaren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/46
Inventor 安茂忠卢俊峰
Owner HARBIN INST OF TECH
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