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Barrel-plating neutral tin plating process

A neutral, tin-plating technology, applied in the field of electroplating, can solve problems such as continuous sheeting and affecting product quality, and achieve the effect of improving hardness, reducing penetration and continuous sheeting

Active Publication Date: 2021-12-31
JIANGSU AISEN SEMICON MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the current problem of connecting pieces in the electroplating process of resistors and capacitors, it seriously affects the product quality

Method used

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  • Barrel-plating neutral tin plating process
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The present embodiment provides a barrel plating neutral tin plating process, and the specific steps are as follows:

[0032] Neutral tin plating solution components: tin methanesulfonate 15g / L, ammonium citrate 80g / L, ammonium sulfate 50g / L, naphthol polyoxyethylene ether 0.5g / L.

[0033] Mix the components of the neutral tin plating solution according to the above ratio, adjust the pH of the plating solution to about 3.4, and then add tyrosine (0.3g / L), phenylalanine (0.3g / L), tryptophan to it (0.4g / L), alkyl glycoside APG1214 (0.3g / L) and polyvinyl alcohol (0.15g / L), then weigh 5kg of resistance product and put it into the drum, electroplate at constant current 48A for 2h, take out the product, and use The sieve separates the contiguous products, drying, weighing, and calculating the contiguous rate:

[0034] Consecutive rate = contiguous product quality / total product quality × 100%.

Embodiment 2

[0036] The present embodiment provides a barrel plating neutral tin plating process, and the specific steps are as follows:

[0037] Neutral tin plating solution components: tin methanesulfonate 15g / L, ammonium citrate 80g / L, ammonium sulfate 50g / L, naphthol polyoxyethylene ether 0.5g / L.

[0038] Mix the components of the neutral tin plating solution according to the above ratio, adjust the pH of the plating solution to about 3.4, and then add tyrosine (0.4g / L), phenylalanine (0.4g / L) and BNO12 (0.2g / L) to it. g / L), then weigh 5kg of resistance product into the drum, electroplate at constant current 48A for 2h, take out the product, use a sieve to separate the contiguous product, dry it, weigh the weight, and calculate the contiguous rate.

Embodiment 3

[0040] The present embodiment provides a barrel plating neutral tin plating process, and the specific steps are as follows:

[0041] Neutral tin plating solution components: tin methanesulfonate 15g / L, ammonium citrate 80g / L, ammonium sulfate 50g / L, naphthol polyoxyethylene ether 0.5g / L.

[0042] Mix the components of the neutral tin plating solution according to the above ratio, adjust the pH of the plating solution to about 3.4, then add tryptophan (1.2g / L) and polyvinylpyrrolidone (0.1g / L) to it, then weigh 5kg The resistance product is put into the drum, and the constant current 48A is electroplated for 2 hours. The product is taken out, and the contiguous product is separated by a sieve, dried, weighed, and the contiguous rate is calculated.

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Abstract

The invention provides a barrel-plating neutral tin-plating process. The barrel-plating neutral tin-plating process comprises the following steps of: carrying out electrified electroplating by using a neutral tin-plating solution containing an additive, wherein the additive comprises aromatic amino acid, and the aromatic amino acid comprises any one or a combination of at least two of tyrosine, phenylalanine or tryptophan. The tin-plating process has the advantages of few continuous sheets, few diffusion plating conditions and high tin layer hardness.

Description

technical field [0001] The invention belongs to the field of electroplating, and in particular relates to a barrel-plating neutral tin-plating process, in particular to a barrel-plating neutral tin-plating process with few contiguous pieces. Background technique [0002] Because tin has the advantages of corrosion resistance, discoloration resistance, non-toxicity, easy brazing, softness, low melting point and good ductility, it is generally used as a coating material on the surface of electronic components. Since most resistors and capacitors are plastic-sealed with ceramics and other materials, strong acid will corrode the ceramics during the tinning process of resistors and capacitors. Therefore, in the tinning process of resistors and capacitors, a tin plating solution with a pH in the range of 3-7 is generally used for electroplating. At present, there are many kinds of neutral plating solutions on the market, but a common problem is that in the process of resistance-ca...

Claims

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Application Information

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IPC IPC(8): C25D3/32
CPCC25D3/32
Inventor 陈春张兵向文胜赵建龙
Owner JIANGSU AISEN SEMICON MATERIAL CO LTD
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