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mail:connection.fukui@gmail.com

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Gold plating details

Gold plating has excellent corrosion resistance, the electrical resistance is the second lowest after silver, it has good thermal conductivity, and it can be used even at high temperatures. It has excellent characteristics that lead to reliability, and it can be bonded with silicon by eutectic.

Until a certain time, the industrial and decorative categories were classified according to the thickness, but nowadays, even for decorative purposes, the thickness is about 10 μm, so those that are extremely thin or that emphasize color tone are for decorative use. Other than that, it can no longer be clearly classified.

Gold plating is a process that is often used mainly for design purposes (design).

It is used for various things such as Buddhist implements, eyeglass frames, necklaces, rings, and metal fittings.

It is also a metal with extremely high corrosion resistance and low contact resistance , and is also used in printed circuit boards, electronic components, and semiconductors.

Nickel allergy is an issue for decorative plating, but even if precious metal plating such as gold or silver is applied to the top layer, the components of the base plating may elute, so in Europe, nickel plating on equipment is used. Use is prohibited.

Although it is not nickel-free, it is possible to apply gold plating for decorative purposes in response to allergies from many years of experience in gold plating related to decoration, and even those who have metal allergies can enjoy precious metal plating.

The hardness of pure gold plating is a soft film of HV60-100, and the hardness is about HV110 when a small amount of silver or organic matter is added by adding a brightener, and other brighteners such as amine compounds or nickel, cobalt, etc. A hard film close to HV200 is formed by adding a metal salt.

In the case of alloy plating such as Au-Cu, it is about HV200 in the precipitated state, but it is cured to about HV400 by heat treatment.

Kind of gold plating

There are 5 types of purity (24K, 22K, 18K, 14K, 10K), and what is called pure gold is 24K.

Gold plating color is alloy ratio, type of compounded metal

It depends on (cobalt, nickel, etc.).

Please contact us for colors.

(Gold content)

14K ・ ・ ・ 56.3 ~ 60.3%

18K ・ ・ ・ 72.9-77.0%

22K ・ ・ ・ 89.7-93.7%

24K ・ ・ ・ 98% or more

Kind of gold plating

There are 5 types of purity (24K, 22K, 18K, 14K, 10K), and what is called pure gold is 24K.

Gold plating color is alloy ratio, type of compounded metal

It depends on (cobalt, nickel, etc.).

Please contact us for colors.

(Gold content)

14K ・ ・ ・ 56.3 ~ 60.3%

18K ・ ・ ・ 72.9-77.0%

22K ・ ・ ・ 89.7-93.7%

24K ・ ・ ・ 98% or more

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ご質問回答
  01 

Q. Is it possible to treat stainless steel with gold?

A. Gold color for stainless steel is available. There are various methods such as gold plating, titanium coat, and clear silver. If you tell us how to use it, we will propose a golden color according to your purpose.

  02 

Q. Is it possible to handle aluminum alloy (A1100) with gold plating, silver plating, and alumite?

A. A1100 can be gold-plated, silver-plated, and alumite-plated, but gold-plated and silver-plated cannot be directly processed on aluminum alloys, so nickel plating is applied to the base before plating for each purpose.

  03 

Q. This is a prototype made of brass, but is it possible to plate it in silver, gold, or pink gold?

Also, this product is made of silver, but is it compatible with silver, gold, and pink gold plating?

A. Since it is a silver color, I think that decorative chrome plating (nickel chrome) is suitable.

Both brass and silver materials can be plated with decorative chrome, gold (gold plating), and pink gold.

  04 

Q. It is a product called a hook pin in which nickel plating is applied to the iron material. Is it possible to express the old beauty color (dull brass color)?

A. It is possible to express antique color (dull brass color) on nickel-plated products.

  05

Q. I am considering gold plating for iron-based materials and copper-based materials, but I would like to avoid fake gold plating, although it will be used in the rubbing part.

Is it possible?

A. We can handle it by considering gold plating.

Since it is a rubbing part, pure gold plating is a soft film and wears due to friction, so hard gold plating (gold-based alloy plating) seems to be appropriate.

Since the base is gold-plated, it is a film that is more vulnerable to wear than other metals, but it is a harder film than pure gold-plated, so it is possible to reduce wear even though it is gold-plated.

  06 

Q. I had another company process the gold plating, but I would like to process the gold plating additionally because the film thickness is not enough. Is it possible to handle the gold plating on top of the gold plating?

A. Gold plating on gold plating requires special pretreatment to ensure adhesion, but it is possible.

If the current gold plating is not a thick film, I think it would be better to peel off only the gold plating and process the gold plating again.

  07 

Q. The aluminum material is gold-plated. I would like to peel it off, reprocess it, and then re-plat it. Is it possible to peel off the gold plating?

A. Gold plating on aluminum can be peeled off.

Please consider that it can be reprocessed after additional processing.

  08 

Q. I would like to partially apply gold plating. Is it possible to handle masking etc.?

A. Gold plating masking is available.

If you send us a drawing that shows the shape etc., we will check whether it can be processed.

  09 

Q. Is it possible to support ALLOY36 (36 Invar: austenitic iron-nickel binary alloy) with gold plating?

I would like to process with a film thickness of 2 μm or more, but is it possible to use a thick film?

A. ALLOY36 (Invar 36) can be gold-plated.

It is also possible to use a thick film.

  10

Q. Ep-Cu / Ni-P5b, E-Au0.03b is stated on the brass cut product. Is it possible to handle it?

A. Ep-Cu / Ni-P5b and E-Au0.03b are copper-based materials with electrolytic Ni-P 5 μm or more and industrial gold plating 0.03 μm or more, but electrolytic Ni-P plating is not available. Electroless nickel (Ni-P) is available if you like.

  11

Q. I would like to apply pure gold plating (24k) to the aluminum material (A5052). Is this possible?

The film thickness of gold plating should be as thin as possible.

A. Although it is pure gold plating on aluminum material, it is not possible to directly apply pure gold plating, so after applying nickel plating to the base.

If pure gold plating is acceptable, it is possible.

The standard nickel plating for the base is about 5 μm and pure gold plating is about 0.03 μm.

Please contact us for details such as film thickness.

  12   ​

Q. I would like to apply pure gold plating (24k) to HPM77 (free-cutting pre-hardened steel). Is this possible?

A. HPM77 can be gold-plated (24K).

If you send us a drawing or illustration that shows the size and shape of the product, we will explain the processing method.I will confirm it.

  13   ​

Q. Is it possible to perform decorative gold plating on clear serum ceramics (ultra-low expansion glass ceramics)?

A. Clear serum ceramics cannot be directly plated with decorative gold, so electroless nickel plating, glossy copper sulfate plating, etc.

It is possible to handle decorative gold plating after applying glossy nickel plating.

  14  ​

Q. Is it possible to apply gold plating to Kovar (alloy containing iron, nickel and cobalt as the main components) for conductive purposes?

A. Kovar material can be gold-plated.

We would appreciate it if you could tell us the specified film thickness.

  15  ​

Q. I would like to apply gold plating to Kovar (an alloy containing iron, nickel, and cobalt as the main components). Is it possible to partially process it?

A. Kovar material can be gold-plated.

Partial support is also possible.

We will confirm the possibility of masking if you can get the material that shows the parts that need to be plated.

  16 

Q. Is it possible to apply matte gold plating to stainless steel (SUS304)?

A. It is possible to use matte gold plating on stainless steel.

The matting method is matting with shot blast.

  17 

Q. It is a product made of iron material shaped like a small button, but there are many and there are no holes for hanging, but gold plating is

Is it possible?

A. Since it is a small button shape, it can be handled by barrel plating (plating in a special container).

Since barrel plating can process a large number of products at once, it has the advantage of being cheaper than rack processing (holding and processing each product one by one).

There is.

The disadvantage is that the products collide with each other in the container, resulting in scratches and dents.

  18 

Q. We are considering gold plating on galvanized steel sheets (for decorative purposes), but the product size is large. Is it possible to handle this?

Dimensions 1800 x 1000 t0.4 mm

A. Gold plating is available for galvanized steel sheets.

The process is performed after removing zinc once, but since peeling and plating are performed in a series of steps, corrosion does not occur.

Please be assured.

Although it is a size point, if it is 1800 x 1000 mm, it will be the size of the limit, but it is possible.

Please note that the gold plating on the center of the board may be lighter due to the large size of the product.

  19 

Q. Aluminum products are gold-plated. Is it possible to remove the gold plating?

A. The gold plating applied to aluminum products can be peeled off.

Please contact us as some sizes may not be available.

  20  ​

Q. Is it possible to perform nickel plating → gold plating on beryllium copper (C-1720P-H)?

A total film thickness of 5 μm or less is desired.

A. Gold plating on nickel plating on beryllium copper is available.

There is no problem with the film thickness.

  21

Q. We are considering gold plating for the purpose of giving decorativeness to ABS resin.

Is it possible to process it?

A. ABS resin can be gold-plated, but it cannot be directly gold-plated, so electroless nickel plating is applied to the base.

It is a process of applying gold plating.

In addition, plating grade ABS (natural color) is available.

  22

Q. I would like to apply gold plating to silver925 earrings. Is it possible to process them?

A. Gold plating can be applied to silver925.

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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)

​Reception hours 9: 00-18: 00 

Direct phone 090-6819-5609

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