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High-temperature-resistant bright tin-plating brightening agent

A brightener and high temperature resistant technology, applied in the field of electroplating additives, can solve the problems of gray spots, pitting, and foggy appearance of the coating, and achieve the effects of increasing cathodicization, reducing foam and bright appearance

Inactive Publication Date: 2013-05-01
武汉吉和昌新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage is that the temperature of the plating solution is relatively low, generally only between 15-25°C. If it exceeds 30°C, the solution is prone to turbidity, precipitation, and Sn4+ is easily produced, and the appearance of the coating will appear foggy. , gray spots, pinholes, pitting, and even whiskers
Secondly, as we all know, the brighteners for Sn plating all contain "carrier" substances that can help dissolve aldehydes and ketones. These "carriers" are surfactants with rich foam. During the process, a large amount of foam is generated and covered on the liquid surface, which inhibits the heat dissipation effect of the solution, causes Sn to diffuse to the cathode, and the electromigration speed is too fast, resulting in a decrease in crystal polarization during deposition, and the coating is dark and rough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Prepare brightener:

[0017] ① Weigh 20 grams of benzylidene acetone and 20 grams of cinnamic acid in a container, add 100 grams of polyethylene glycol octyl phenyl ether-10, 100 grams of polyethylene glycol octyl phenyl ether-21, and heat Stir until it is completely dissolved and transparent, then cool to room temperature; ②Put 400ml of deionized water in another container, add 35g of sodium benzoate, heat and dissolve until transparent; ③Put 150ml of deionized water in another container , add 8 grams of p-aminobenzenesulfonic acid, heat and dissolve until transparent; ④ mix the above three solutions ①, ②, and ③ together, add deionized water to 1000 ml, stir well to form an emulsified ketone mixture;

[0018] Put 150 grams of succinimide into 1000 ml of deionized water, heat and dissolve until transparent, and make up to 1400 ml with water to obtain a succinimide solution;

[0019] Weigh 20 grams of 3-(benzothiazole-2-mercapto)-propanesulfonate sodium and dissolve it ...

Embodiment 2

[0024] Prepare brightener:

[0025] ① Weigh 25 grams of benzylidene acetone and 25 grams of cinnamic acid in a container, add 125 grams of polyethylene glycol octyl phenyl ether-10, 125 grams of polyethylene glycol octyl phenyl ether-21, and heat Stir until it is completely dissolved and transparent, then cool to room temperature; ②Put 400ml of deionized water in another container, add 50g of sodium benzoate, heat and dissolve until transparent; ③Put 150ml of deionized water in another container , add 12 grams of p-aminobenzenesulfonic acid, heat to dissolve until transparent; ④ mix the above three solutions ①, ②, and ③ together, add deionized water to 1000 ml, stir well to form an emulsified ketone mixture;

[0026] Put 200 grams of succinimide into 1000 ml of deionized water, heat and dissolve until transparent, and make up to 1400 ml with water to obtain a succinimide solution;

[0027] Weigh 25 grams of 3-(benzothiazole-2-mercapto)-propanesulfonate sodium and dissolve it ...

Embodiment 3

[0032] Prepare brightener:

[0033] ① Weigh 23 grams of benzylidene acetone and 23 grams of cinnamic acid in a container, add 110 grams of polyethylene glycol octyl phenyl ether-10, 120 grams of polyethylene glycol octyl phenyl ether-21, and heat Stir until it is completely dissolved and transparent, then cool to room temperature; ②Put 400ml of deionized water in another container, add 40g of sodium benzoate, heat and dissolve until transparent; ③Put 150ml of deionized water in another container , add 10 grams of p-aminobenzenesulfonic acid, heat and dissolve until transparent; ④ Mix the above three solutions ①, ②, and ③ together, add deionized water to 1000 ml, stir well to form an emulsified ketone mixture;

[0034]Put 160 grams of succinimide into 1000 ml of deionized water, heat and dissolve until transparent, and make up to 1400 ml with water to obtain a succinimide solution;

[0035] Weigh 23 grams of 3-(benzothiazole-2-mercapto)-propanesulfonate sodium and dissolve it ...

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PUM

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Abstract

The invention relates to an electroplating additive, in particular to a high-temperature-resistant bright tin-plating brightening agent and tin-plating liquid thereof. The brightening agent is formed by mixing emulsifying ketone mixed liquid, succimide solution, 3-(benzothiazole-2-sulfydryl)-propane sodium sulfonate solution and 2-ethyl hexyl sodium sulfate solution according to the volume ratio of (3-5):(5-7.5):(1.5-2.5):(2.5-3.5). The formula of the tin-plating liquid is that: one liter of the tin-plating liquid consists of 30 to 60 grams of SnSO4, 70 to 100 milliliters of H2SO4, 20 to 35 milliliters of stabilizing agent and 20 to 30 milliliters of brightening agent. The brightening agent is formed by mixing the emulsifying ketone mixed liquid, the succimide solution, the 3-(benzothiazole-2-sulfydryl)-propane sodium sulfonate solution and the 2-ethyl hexyl sodium sulfate solution according to the volume ratio of (3-5):(5-7.5):(1.5-2.5):(2.5-3.5). The tin-plating liquid can resist high temperature, wherein the operating temperature can reach 45 DEG C. By the tin-plating liquid, the tin coating is bright in appearance.

Description

technical field [0001] The invention relates to an electroplating additive, in particular to a high-temperature-resistant bright tin-plating brightener and its tin-plating solution. Background technique [0002] In the electronics industry, the requirements for bright tin plating are very strict. It should not only meet the conventional requirements of good bonding, fine and smooth crystallization, low brittleness, and good solderability, but also require the coating to be free of tin whiskers, leaks, pins, etc. Holes and pitting; the plating solution should also have a fast deposition rate and be able to work under higher temperature conditions. [0003] The current bright tin plating is mainly sulfate-sulfuric acid solution process. It is characterized by simple composition, fast deposition speed, convenient operation and low cost, and the obtained coating can basically meet the above requirements. But the disadvantage is that the temperature of the plating solution is r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/32
Inventor 宋文超左正忠胡哲周自强
Owner 武汉吉和昌新材料股份有限公司