Chemical tin plating liquid and preparation method thereof

A technology of electroless tin plating and tin salt, which is applied in the direction of liquid chemical plating, metal material coating process, coating, etc. It can solve the problems of slow deposition speed, coating cannot meet the quality requirements, poor stability of plating solution, etc., and achieve improvement Stability, superior environmental protection performance, bright and beautiful coating effect

Active Publication Date: 2019-10-15
GUANGZHOU SANFU NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the tin bath is stable against unwanted tin plating out or precipitation of bath components, its deposition rate is slow
[0006] At present, the existing electroless tin plating solution has problems such as slow deposition speed, poor stability of the plating solution, and the coating cannot meet the quality requirements.

Method used

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  • Chemical tin plating liquid and preparation method thereof
  • Chemical tin plating liquid and preparation method thereof
  • Chemical tin plating liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1, a kind of electroless tin plating solution

[0035] In the electroless tin plating solution, the density is 1.84g / cm 3 The content of sulfuric acid is 33mL·L -1 , the content of tin salt is 10g·L -1 , the content of complexing agent is 85g·L -1 , the content of the multifunctional additive is 0.5g·L -1 , the content of reducing agent is 25g·L -1 , the content of functional additives is 1g·L -1 The tin salt is stannous sulfate; the complexing agent is tartaric acid; the multifunctional additive is composed of polyvinylpyrrolidone, alkyl glycoside and polyethylene glycol with an average molecular weight of 400 in a mass ratio of 1:6:15 ; The reducing agent is titanium trichloride; The functional auxiliary agent is composed of sodium lignosulfonate modified product and polysilicate ferric sulfate in a mass ratio of 5:2.

[0036] The preparation method of described sodium lignosulfonate modification is:

[0037] (1) add water to sodium lignosulfonate, b...

Embodiment 2

[0042] Embodiment 2, a kind of electroless tin plating solution

[0043] In the electroless tin plating solution, the density is 1.84g / cm 3 The content of sulfuric acid is 40mL·L -1 , the content of tin salt is 15g·L -1 , the content of complexing agent is 95g·L -1 , the content of the multifunctional additive is 1.2g·L -1 , the content of reducing agent is 40g·L -1 , the content of functional additives is 2g·L -1 ; The tin salt is stannous sulfate; the complexing agent is composed of sodium gluconate, tartaric acid and malic acid in a mass ratio of 3:1:1; the multifunctional additive is composed of polyvinylpyrrolidone, alkyl glycoside and average molecular weight 400 polyethylene glycol is composed of 2:4:12 by mass ratio; the reducing agent is titanium trichloride; 7:1 composition.

[0044] The preparation method of described sodium lignosulfonate modification is:

[0045] (1) add water to sodium lignosulfonate, be mixed with the sodium lignosulfonate aqueous soluti...

Embodiment 3

[0049] Embodiment 3, a kind of electroless tin plating solution

[0050] In the electroless tin plating solution, the density is 1.84g / cm 3 The content of sulfuric acid is 38mL·L -1 , the content of tin salt is 12g·L -1 , the content of complexing agent is 88g·L -1 , the content of the multifunctional additive is 0.7g L -1 , the content of reducing agent is 32g·L -1 , the content of functional additives is 1.2g·L -1 ; The tin salt is stannous sulfate; the complexing agent is composed of sodium gluconate and sulfamic acid in a mass ratio of 5:13; The polyethylene glycol is composed of a mass ratio of 1:5:14; the reducing agent is titanium trichloride; the functional auxiliary agent is composed of a modified sodium lignosulfonate and polysilicate ferric sulfate in a mass ratio of 5: 1 composition.

[0051] The preparation method of described sodium lignosulfonate modification is:

[0052] (1) add water to sodium lignosulfonate, be mixed with the sodium lignosulfonate aqu...

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Abstract

The invention belongs to the technical field of chemical tin plating, and in particular, relates to chemical tin plating liquid and a preparation method thereof. The chemical tin plating liquid contains sulfuric acid, tin salt, complexing agents, multifunctional additives, reducing agents and function auxiliaries; and in the chemical tin plating liquid, the content of the sulfuric acid is 33-40 mL.L-1, the content of the tin salt is 10-15 g.L-1, the content of the complexing agents is 85-95 g.L-1, the content of the multifunctional additives is 0.5-1.2 g.L-1, the content of the reducing agentsis 25-40 g.L-1, and the content of the function auxiliaries is 1-2 g.L-1. The chemical tin plating liquid is excellent in stability, and accelerates the plating layer deposition speed when the stability of the plating liquid is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical tin plating, and in particular relates to a chemical tin plating solution and a preparation method thereof. Background technique [0002] Tin is located in the fifth period and group IVA in the periodic table of elements, and its valence shell electron configuration is 5s25p2. Tin element is a soft (hardness 12HV), low melting point (231.89°C), white metal with good ductility. There are three allotropes, gray tin (α), white tin (β), brittle tin ( gamma). Tin has the advantages of easy fibrillation, oxidation resistance, and non-toxicity, and is widely used in various fields of industry. [0003] Tin coating is a coating with certain corrosion resistance, which is widely used in electronic components and printed circuit boards. Tin plating is decorative and keeps items looking good even when exposed to air and moisture. At the same time, tin is stable to organic acids and tin compounds are har...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/52
CPCC23C18/52
Inventor 田志斌邓正平郭艳红许荣国
Owner GUANGZHOU SANFU NEW MATERIALS TECH
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