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A kind of treatment method of acidic bright tin plating solution

A technology of tin plating solution and treatment method, which is applied in the field of treatment of acidic bright tin plating solution, can solve the problems of limited adsorption capacity of activated carbon, waste of resources, increase of difficulty in filtration, etc., and achieve the effect of repeated recycling and reduction of usage

Active Publication Date: 2020-09-04
CHANGDE LYRUN MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large amount of organic impurities in the plating solution to be treated, sometimes metastannic acid colloids are difficult to flocculate and precipitate, and due to the limited adsorption capacity of activated carbon, the amount of activated carbon will be increased and the adsorption will not be complete, which will increase the difficulty of filtration, and the solution cannot be recycled repeatedly. Generally, the plating solution must be discarded after 2-3 times of treatment, resulting in a waste of resources

Method used

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  • A kind of treatment method of acidic bright tin plating solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 1L of the plating solution to be treated, heat it to 75°C and keep it warm for 4 hours, cool naturally to 35°C, remove the upper layer of oil after layering, and slowly add 30ml SY-800 flocculant while stirring; continue to stir, add 3g of activated carbon, and let it stand After more than 24 hours, filter the supernatant to obtain the treated plating solution, and measure its Sn 4+ Concentration and light transmittance, the results are shown in Table 1.

[0031] Add additives such as brightener and stabilizer to the plating solution after the above treatment, and continue the electroplating reaction after electrolysis with a small current. Observe the coating of the plated parts, the results are shown in Table 1.

Embodiment 2

[0033] Take 1L of the plating solution to be treated, heat it to 70°C and keep it warm for 4 hours, cool it naturally to 30°C, remove the upper layer of oil after layering, and slowly add 40g of polyacrylamide flocculant while stirring; continue to stir, add 5g of activated carbon, and let it stand After more than 24 hours, filter the supernatant to obtain the treated plating solution, and measure its Sn 4+ Concentration and light transmittance, the results are shown in Table 1.

[0034] Add additives such as brightener and stabilizer to the plating solution after the above treatment, and continue the electroplating reaction after electrolysis with a small current. Observe the coating of the plated parts, the results are shown in Table 1.

Embodiment 3

[0036] Take 1L of the plating solution to be treated, heat it to 80°C and keep it warm for 4 hours, cool naturally to 40°C, remove the upper layer of oil after layering, and slowly add 20g of polyvinylamide flocculant while stirring; continue to stir, add 4g of activated carbon, and let it stand After more than 24 hours, filter the supernatant to obtain the treated plating solution, and measure its Sn 4+ Concentration and light transmittance, the results are shown in Table 1.

[0037] Add additives such as brightener and stabilizer to the plating solution after the above treatment, and continue the electroplating reaction after electrolysis with a small current. Observe the coating of the plated parts, the results are shown in Table 1.

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Abstract

The invention provides a method for treating an acidic bright tin plating solution. The tin plating solution is heated to 70-80 DEG C at first, heat preservation is conducted for 4 hours, after the solution is layered, the solution is naturally cooled to 30-40 DEG C, oil stains at the upper layer are removed, a flocculant is added with stirring, activated carbon is added while stirring is continued, then the solution is subjected to still standing for 24 hours, the solution is layered again, and supernatant liquid at the upper layer is reserved through filtration, that is, the clear acidic bright tin plating solution is obtained. Through the method for treating the acidic bright tin plating solution, most of the organic impurities can be removed at first, only metastannic acid colloid anda small amount of residual organic impurities are left, flocculation and precipitation of the metastannic acid colloid through the flocculant are facilitated and ensured, meanwhile, the using amount of activated carbon is reduced, and the plating solution can be recycled repeatedly.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and in particular relates to a treatment method for an acidic bright tin plating solution. Background technique [0002] Tin is a soft silver-white metal with good ductility and high chemical stability. It is not easy to change color in the atmosphere, and it does not work with sulfur and sulfide. It is in the dilute solution of sulfuric acid, nitric acid and hydrochloric acid Almost insoluble, only slowly dissolved in hot concentrated acid and strong alkali solution. [0003] Acid tin plating is an electroplating process developed in the 1960s. Tin plating has the advantages of low toxicity, good environmental performance, fast deposition speed, high current efficiency and good corrosion resistance, and has gradually been popularized and applied at home and abroad. Sulphate tin plating process has simple components, easy to obtain raw materials, low cost, fast deposition speed, high cur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/30
CPCC25D3/30
Inventor 李星黄泽交肖腾彬肖进春蒋素斌
Owner CHANGDE LYRUN MATERIAL
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