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A kind of potassium sulfide-resistant silver antioxidant and preparation method thereof

An antioxidant, potassium sulfide technology, applied in the field of metal coating protection, can solve problems such as discoloration of the surface layer

Active Publication Date: 2020-10-27
GUANGZHOU HONWAY TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention solves the problem of discoloration of the surface layer of electroplated silver and silver alloys soaked in 5wt% potassium sulfide for 7 to 10 minutes at normal temperature

Method used

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  • A kind of potassium sulfide-resistant silver antioxidant and preparation method thereof
  • A kind of potassium sulfide-resistant silver antioxidant and preparation method thereof
  • A kind of potassium sulfide-resistant silver antioxidant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of potassium sulfide-resistant silver antioxidant, its component and content are:

[0039]

[0040] A preparation method of a potassium sulfide-resistant silver antioxidant, comprising the steps of:

[0041] Under stirring conditions, according to the mass percentage, the polyoxyethylene sorbitan oleate and propylene glycol polyoxyethylene ether were respectively added to water at a temperature of 50-60°C to prepare a mixed solution; keep stirring, and then sequentially Adding said dodecyl mercaptan and sodium benzoate promptly makes the silver antioxidant resistant to potassium sulfide, which is referred to as silver antioxidant 1.

[0042] Preparation of silver-plated test pieces

[0043] pre-processing

[0044] Degreasing (BH-8 produced by Guangzhou Hongwei Technology Co., Ltd.)→Water washing→Alkaline etching (50g / L NaOH, 30~45℃, 1min)→Water washing→Descaling (BH produced by Guangzhou Hongwei Technology Co., Ltd. -36) → primary zinc precipitation (BH-126...

Embodiment 2

[0053] A kind of potassium sulfide-resistant silver antioxidant, its component and content are:

[0054]

[0055] A preparation method of a potassium sulfide-resistant silver antioxidant, comprising the steps of:

[0056] Under the condition of stirring, according to the mass percentage, the polyoxyethylene sorbitan hexaoleate and isomeric tridecanol polyoxyethylene ether were respectively added to water at a temperature of 50-60°C to prepare a mixed solution; keep stirring , and then add the stearyl mercaptan and potassium gluconate in sequence to obtain the potassium sulfide-resistant silver antioxidant, which is referred to as silver antioxidant 2.

[0057] Preparation of silver-plated test pieces

[0058] (1) pretreatment: with embodiment 1.

[0059] (2) electroplating: with embodiment 1.

[0060] (3) Post-processing:

[0061] Silver antioxidant treatment: 38°C, 3min, filter and stir.

Embodiment 3

[0063] A kind of potassium sulfide-resistant silver antioxidant, its component and content are:

[0064]

[0065] A preparation method of a potassium sulfide-resistant silver antioxidant, comprising the steps of:

[0066] Under the condition of stirring, according to the mass percentage, the polyoxyethylene sorbitan hexaoleate and isomeric tridecanol polyoxyethylene ether were respectively added to water at a temperature of 50-60°C to prepare a mixed solution; keep stirring , and then sequentially add the dodecyl mercaptan and potassium malate to obtain the potassium sulfide-resistant silver antioxidant, which is referred to as silver antioxidant 3.

[0067] Preparation of silver-plated test pieces

[0068] (1) pretreatment: with embodiment 1.

[0069] (2) electroplating: with embodiment 1.

[0070] (3) Post-processing:

[0071] Silver antioxidant treatment: 48°C, 4min, filter and stir.

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Abstract

The invention discloses an excellent potassium sulphide-resistant silver antioxidant. The excellent potassium sulphide-resistant silver antioxidant is characterized by comprising the following raw materials by mass fraction: 0.1 wt% to 1 wt% of alkyl sulfhydryl, 0.5 wt% to 1 wt% of polyoxyethylene ester, 1 wt% to 2 wt% of fatty alcohol-polyoxyethylene ether and 1 wt% to 2 wt% of a metal deactivator, and the balance being water. Compared with the prior art, the excellent potassium sulphide-resistant silver antioxidant has the following advantages of having relatively good stability for adsorption effect, having a chelation function for free Ag<+>, and being not oxidized and discolored after being soaked for 7 to 10 min in 5-wt% potassium sulphide.

Description

technical field [0001] The invention belongs to the field of metal coating protection, in particular to a potassium sulfide-resistant silver antioxidant and a preparation method thereof. Background technique [0002] Silver and its alloys as the outer coating have the advantages of excellent electrical conductivity, beautiful appearance, and good ductility. Therefore, people often electroplate a layer of silver on the surface of aluminum communication equipment as a good thermal and electrical conductive magnetic layer, but untreated or The silver coating layer with poor treatment effect is easily destroyed by O in the air. 2 , SO 2 、H 2 S, Cl 2 , NO x Such as oxidation to produce silver sulfate, nitrate, chloride, sulfide, etc., resulting in discoloration, affecting performance and appearance. Among them, the influence of black silver sulfide is the most serious. At present, antioxidant treatment is generally carried out after the silver plating process to increase th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/48
Inventor 廖磊华赵国鹏胡耀红徐金来
Owner GUANGZHOU HONWAY TECH CORP
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