Methanesulfonic acid type tin plating brightener

Sn-819 is a tin plating process based on methanesulfonic acid substrate. The coating is bright, suitable for rack plating and barrel plating. The weldability of the coating is superior. The plating solution does not corrode titanium, ceramics, and glass.

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Product Description

Methanesulfonic acid type tin plating brightener

Sn-819 High Speed Bright Tin Plating Additive

Sn-819 is a tin plating process based on methanesulfonic acid substrate. The coating is bright, suitable for rack plating and barrel plating.

The weldability of the coating is superior. The plating solution does not corrode titanium, ceramics, and glass.

Salient features:

    ·Lead-free and cadmium - free.

    ·Comply with ROHS and ELV environmental protection directives.

    ·No alkylphenol polyoxyethylene ether.

    ·Excellent walking ability.

    ·Excellent weldability.

    ·The coating is bright and uniform white.

    ·High stability and easy maintenance.


    Plating tank: It is recommended to use polyethylene, polypropylene, PVC lining, hard rubber lining plating tank. Do not use unlined steel, stainless steel plating cylinders or lead-lined plating cylinders.

·Heating and cooling: No heating required. It can be heated directly or indirectly if necessary. The immersion heater or heat exchanger must use an acid-proof outer cover. The temperature of the electrolyte must be maintained between 18-30°C.

·Filtration: In order to ensure the uniformity of the electroplating layer, filtration is required. A stable filter in the bath can be used. It is recommended to use an acid-proof polypropylene filter tube. If the plating solution is very turbid, a good quality filter can be used. Do not use rubber filter tubes.

·Stirring: the rack-plated workpiece is stirred with a speed machine of 0.5-1 m/min. Because oxygen can convert divalent tin into trivalent tin, air stirring is not allowed.

·Anode: A pure tin anode must be used. The impurity-containing anode has an effect on the coating. The anode area should be reasonable, not more than 3A/square decimeter. Polypropylene can be used as the anode basket. If the plating is stopped for a long time, the anode needs to be lifted to prevent the metal content in the plating solution from being too high.

·Rectifier: Use a rectifier with a residual ripple less than 5%.


Open the cylinder:

The cylinder opening is 100 liters.

Tin methanesulfonate-5 liters

Methanesulfonic acid-14 liters

Sn-819A softener-4.5 liters

Sn-819B brightener-1 liter

Operating conditions

Tin content (divalent tin)

50ml/liter (13-20g/liter)

Methanesulfonic acid

140 ml/liter (100-180 g/liter)

Sn-819A softener


Sn-819B brightener



Room temperature (18-25℃)

Cathode current density

0.5-3.0 A / dm 2

Anode rod movement 

0.5-1 m/min

Deposition rate

Every 1A/square decimeter, about 0.5-1.0 microns/minute


Bath preparation

·Add half a tank of water into the plating tank, add acid carefully, and stir

·Add the required tin methanesulfonate and stir evenly

·Add tin brightener, softener, then add pure water and stir evenly


Tin brightener and softener should not be stored for a long time at a temperature lower than 15°C and higher than 36°C.



When maintaining the plating solution, the following components are needed:

Tin methanesulfonate

Methanesulfonic acid

Sn-819A softener

Sn-819B brightener


Tin concentration

The concentration of divalent tin should be maintained. If the concentration of divalent tin is too low, add tin methanesulfonate.

If you want to increase the tin concentration of 100 liters of bath by 1 g/liter, add 0.5 liter of tin methanesulfonate.


Concentration of acid concentrate

The free acid concentration should not be less than 100 g/l. When replenishing, add tin methanesulfonate at a concentration of 70%. If you want to increase the acid concentration of 100 liters of plating solution by 1 g/liter, add 143 ml of methanesulfonic acid.


Sn-819B brightener and Sn-819A softener

Kiloamp hour consumption

Sn-819B brightener: 0.2-0.3 liters

Sn-819A softener: 0.1-0.2 liters

Tin plating defoamer:

Generally speaking, no defoamer is needed. If the appearance of foam endangers the quality of the plated parts, add 1-2 ml/liter tinning defoamer. This additive does not contain mineral oil and silicon. It is provided as an emulsifier. Shake well before use.

Analytical method:

Analysis of tin concentration:

Required equipment

5ml measuring cylinder

10ml measuring cylinder

250ml Erlenmeyer flask

50ml dropper

0.1N equivalent iodine solution (I 2 ): Dissolve 13 grams of iodine and 26 grams of potassium iodide in pure water or distilled water, and dilute to 1 liter.

0.2% starch solution: Dissolve 2 grams of starch with 500 ml of pure water or distilled water, and dilute to 1 liter.


Use a straw to sample 5 ml of operating fluid to a 250 ml conical flask.

Add 100 ml of pure water and 10 ml of hydrochloric acid to the conical flask.

Stir well and add a few drops of freshly prepared starch solution.

Titrate with 0.1N equivalent iodine solution until the colorless solution turns blue.


Titrate the number of milliliters of iodine solution*molar amount of iodine*11.869=? ? G/l tin


Methanesulfonic acid concentration analysis

Required equipment

10ml straw

100ml measuring cylinder

50 ml burette

250ml conical bottle


1.0N sodium hydroxide solution: Dissolve 40 grams of experimental grade sodium hydroxide with 500 ml of pure water or distilled water, and dilute to 1 liter.

Phenolphthalein indicator


Use a straw to sample 10 ml of operating fluid to a 250 ml conical flask.

Add 100 ml of pure or distilled water and a few drops of phenolphthalein indicator to the conical flask.

The 1.0N sodium hydroxide solution was titrated until the colorless solution turned pink.


1.0N sodium hydroxide solution titrated ml quantity * sodium hydroxide molar quantity * 6.693=? ? G/L methanesulfonic acid


1. Q: Do you make the products yourself? Are you a trader or a manufacturer?

     A: Yes, the products are produced by our company. Our company is a manufacturer focusing on the R&D and manufacturing of environmental protection electroplating additives. Our factory has 5000 square meters with an annual capacity of 15000 tons.

2. Q: Can your company send samples for trial?

     A: We can provide samples for trial.

3. Q: What is the quality of your products?

     A: Our company all products core raw materials is used by Germany BASF, American Dow Chemical and other international brand products. The production process is strictly in accordance with the ISO9001 quality management system, from the incoming inspection, product inspection, according to the strict inspection standard, ensure that every drop of products qualified. Product quality you can rest assured, like BYD, Huawei, Foxconn such enterprises are also using our products.

4. Q: How long is the shelf life of your products?

     A: The shelf life of our products is two years. If you do not use up the products within a short time after you buy them, we suggest you store them in a cool place, not in the sun or in a high temperature environment.

5. Q: Are your products environmentally safe?

     A: Our products have passed the SGS test and are recognized as "Green and Environment-friendly Promotion Products". Many auto parts and electronic products which use our products can pass the strict environmental protection test when they are exported to Europe and America. Therefore, we can be trusted in terms of environmental protection and safety.

6. Q: Can your company provide technical services?

     A: Yes, our company has a technical service team of more than 10 people. The technical engineers all have more than 20 years' experience in electroplating factory. They can provide customers with comprehensive technical of pre-sales and after sales.

7. Q: Is it possible to visit your company?

     A: Yes, of course. You are very welcome! We can meet you at Jieyang airport, If you can come to our city. Also you can visit our factory through live video.

8. Q: Can you customize products according to our needs?

     A: Yes, our company has research and development strength, the product formula derived from Europe and the United States laboratory, European and American engineers technical support, work together with domestic universities. Our company has a member of Guangdong province expert enterprise workstation, Shantou university science and technology correspondent workstation, Jieyang city environmental protection engineering research center for electroplating additive.Therefore, it can meet all kinds of customized requirements proposed by customers.

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