Details of tin plating
Tin is a silver-white metal that is soft, highly malleable, has a low melting temperature (231.9 ° C), and has good solderability, so it is used for soldering electronic parts, sliding parts of contact terminal parts and machines, and plating to prevent nitridement. Has been done.
Tin plating can be roughly divided into acidic baths and alkaline baths. Acid baths include sulfuric acid baths, boron fluoride baths, sulfonic acid baths, and alkaline baths include tin salt baths and pyrophosphate baths. Sulfuric acid baths that provide a smooth mirror surface gloss are often used, but neutral tin plating has also been developed and used for plating ceramic composite parts of electronic parts.
Pure tin plating, tin-cobalt alloy, tin-nickel alloy, etc. are used as decorative tin alloy plating films.
Pure tin plating has a beautiful silver color, tin-cobalt alloy plating has a pale color similar to decorative chrome plating, and tin-nickel alloy has a pinkish appearance.
Copper-tin plating has also been put into practical use as a countermeasure against nickel allergies.
Since tin has excellent corrosion resistance against corrosion by organic acids, tin-plated steel sheets are used as tinplate for canning, roofs, containers, etc.
Since the rust prevention of tin plating works in a barrier type, rust prevention is excellent when the plating completely covers the iron base, but corrosion is promoted when the film is defective.
[Lithium discharge characteristics]
Tin is charged by forming a metal compound with lithium, and is discharged by desorption of lithium.
Since tin expands during charging and contracts during discharging, the discharge capacity decreases as the charge / discharge cycle elapses.
Glossy tin ・ ・ ・ HV40-60
Matte tin ・ ・ ・ HV5 ～ 7
Comparison of tin plating and tin alloy plating film
The melting point, solid phase point, solderability, and whisker-proneness of the tin-plated film.
For comparison, it is the data of alloy plating such as solder plating, tin-silver plating, tin-bismas plating, tin-copper plating.
Q. Is it possible to handle beryllium copper material procurement, machining, surface polishing, buffing, and tin plating?
A. I have confirmed the drawing.
We can handle everything from material arrangement, machining, surface polishing, buffing, and tin plating.
Q. Is it possible to support C1020 oxygen-free copper with matte Sn plating (dimensions: 10 x 145 x t1.0)?
A. It is necessary to check the shape such as drawings, but it can be processed in terms of size.
Q. Is it possible to handle tough pitch copper with nickel plating 2μm and tin plating 5μm?
Dimensions: 25 x 5 t0.8mm
A. We can handle including dimensions and processing specifications.
Q. Base material: Chromium copper treatment: Is it possible to handle tin-plated 20 μm?
A. Tin plating is available for chrome copper material.
If you have a drawing, please send it and we will check it including the size etc.
Q. The glossy tin plating causes pits, swelling, etc. What is the cause and what should I do as a countermeasure?
A. Glossy tin plating is easily affected by the main component, the concentration of the brightener, the treatment conditions, the treatment temperature, etc., so first check whether the bath concentration, usage conditions, etc. are within the appropriate range, and if there is something outside the range, the appropriate value. Please adjust to.
Q. There is a case where tableware is silver-plated. We are also considering tin-plating, but is it possible?
A. It is necessary to confirm the tin-plated size on the tableware, but it is possible.
Our tin plating is glossy tin plating.
Q. I have tin-plated brass terminals. Please tell me the possible causes of darkening after tin-plating.
The process is degreasing → acid treatment → cyanide copper plating → alkaline tin plating. It will be processed by barrel plating.
A. We have confirmed the process.
It is thought that it is darkening due to the increase in the copper component in the alkaline tin plating from the process.
If you measure the metal impurities in the plating solution and the copper component is increasing, you can solve the problem by removing it with a weak electrolysis (cathode).
Q. I would like to build an acidic tin-plated bath. Can it be used with industrial sulfuric acid?
A. Some products cannot be used depending on the quality of industrial sulfuric acid, so please check with the Halsel test by first bathing in about 1 L.
Q. The iron material (S45C) is tin-plated, but I would like to have it peeled off for additional processing. Is it possible to peel off the current plating film?
A. Tin plating can be peeled off from iron material (S45C).
When peeling, the plating film is peeled off using a peeling liquid, but care must be taken as the material will be slightly roughened.
Q. I have been designated for tin and lead alloy plating. Is it possible?
A. Tin-lead alloy plating is generally called solder plating, but there are tin 9: lead 1 9: 1 solder and tin 6: lead 4 eutectic solder plating. ..
If you let us know what kind of alloy ratio you want, we will confirm the possibility of processing.
Q. Some products are solder-plated (alloy ratio is unknown). Is it possible to change the plating because there is a request to change it to lead-free? The base material is brass.
A. It is possible to change the plating process. It is possible to change to lead-free by peeling off the solder plating that is currently being treated with a treatment liquid and then applying the desired lead-free plating treatment again.
Q. I am considering tin plating because zinc die-cast products come into contact with food.
Is it possible to process it? Also, for products that come into contact with food, what film thickness do you need?
A. Zinc die-cast is an amphoteric metal that is weak against acids and alkalis, and the tin plating solution is a strong acid and strong alkali, so direct tin plating cannot be performed.
Therefore, it is possible to apply tin plating by applying copper plating to the base.
The underlying copper plating requires a plating thickness of about 5 μm, and the tin plating requires a plating thickness of 12 μm or more.
Q. I would like to partially process MFSn2. What are the specifications?
Is it possible for your company to handle it?
A. MFSn2 is an iron-based material with electric tin plating class 2 (5 μm or more).
We can handle it. Partial plating is also available, but it is necessary to check the shape and the parts that require plating.
Q. Is it possible to treat SS41 ( rolled steel for general structure) with glossy tin plating 10 μm?
A. SS41 is the old standard of SS400, but SS41 can be treated with glossy tin plating 10μm.
Q. I would like to apply tin plating to the aluminum material (A5052). Is this possible?
A. Although it is tin plating on aluminum material, it cannot be processed directly, so electroless nickel plating is required for the base.
Please contact us for details such as film thickness.
Q. Is tin plating possible on C1100 (tough pit copper)?
A. Tough pitch copper can be tin plated.
When I checked the drawing, there is no hole to hang the product, so I will tie it with a part of the product or process it with a basket etc.
It will be supported by.
I would appreciate it if you could specify it.
Q. Is it possible to apply matte tin plating to stainless steel (SUS304)?
A. Matte tin plating is available for stainless steel.
You can choose between shot blasting and matte tin plating as the matting method.
Q. The copper-based material is tin-plated. Is it possible to remove the tin-plating?
A. It is possible to remove the tin plating applied to copper-based materials.
There is a size limit, so please tell me the size etc.
Q. The drawing clearly states that MBSn-II is 5 to 10 μm. Is it possible for your company to handle it?
A. MBSn-II 5-10μm We can handle it.
Please note that our tin plating is glossy tin plating.
Connection Co., Ltd.
Please feel free to contact us for plating, coating, polishing, heat treatment, etc.
Consultations and quotations are free.
4-202-5 Shizugaoka, Fukui City, Fukui Prefecture 910-3635 (Japan)