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topic 23519

Silver plating with silver nitrate

Current question and answers:

February 9, 2021

Q. Can you please elaborate on the process used to deposit the silver coating: "Dissolve nitrate in 50 gr water, add ammonium chloride dissolved in same amount of water, and then add thiosulphate dissolved in 900 ml water"
"Please supply some instructions on the process of immersion silver coating from a silver nitrate bath and a reducing agent (2-part silvering solution)."

Application instruction please. Attached is a video of silver deposition:
[video of proprietary chrome-look paint application deleted by editor]

Can you help with chemical formula for the same?

Nirmal jain
- Mumbai, India
^-- Answer or Comment on this question --^
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February 2021

A. Hi cousin Nirmal. Goran has offered a generic formula for this and its origin -- have you had a chance to make up a batch and try it? Sorry, but we can't post your video of a particular trade secret chrome-look paint and ask people to post its improved composition -- that would be too close to crowd-sourcing industrial espionage :-)

You have to either buy a proprietary, or start with published generic formulas and possibly improve upon them. Good luck.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com - Pine Beach, New Jersey
Aloha -- an idea worth spreading




Previous closely related Q&A's starting in:

Ed. note: Apologies but, perhaps because of the vague title of this page, this discussion mixes chrome-look paint, with mirror silvering, with immersion silvering onto copper, with electrodeposition of silver, with making of silver cyanide :-(

2003

Q. Dear Sir,

My friend wants to do silver plating with silver nitrate. He needs your help. If he wants to make silver cyanide from silver nitrate, how to does it?

Thanks,

Hashemi
- Shahinshahr, Esfahan, Iran

^-- Answer or Comment on this question --^

2003

A. Dear,

A. For silver plating, use of cyanide is common and you can find silver cyanide in every shop, but if you want to get silver cyanide from nitrate, mix the 2x molar equivalent of sodium cyanide with silver nitrate to have Ag(CN)2 complex. Be careful from cyanide gas that may release from acidic solution and may kill your friend!

Vahid Hosseyni
- Tehran, Iran


2003

A. Good advice, Mr. Hosseyni. When an experiment has a great possibility of very dangerous or serious result, it can be foolhardy to try to read about how to do it. Hashemi should have personal hands-on instruction, not free Internet advice, before working with cyanide.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha



2003

Q. Dear Mr.Mooney Can I do silver plating with silver nitrate? Thanks

Hashemi [returning]
- Shahinshahr, Esfahan, Iran

^-- Answer or Comment on this question --^

2003

A. Not exactly. Although it is possible to apply a silver coating from a silver nitrate bath and a reducing agent (2-part silvering solution, Brashear process), to my knowledge it is not possible to do real silver electroplating from anything but silver cyanide or proprietary solutions.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha


October 18, 2009

Q. For an art project we are trying to silver coat copper items, and think silver nitrate would work as the source of silver. But what current do you use to move the silver to the copper?

thanks

Bryon Hancock
student - Milwaukee, Wis
^-- Answer or Comment on this question --^

October 19, 2009

A. Hi, Bryon. You don't need electricity. The inherent nobility of silver compared to copper provides the electrical energy. Please see our FAQ: "Silver Plating at Home". Good luck.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha


October 23, 2009

A. Immersion silver plating bath-your object must be grease and oxide free! 15 gm silver nitrate/30 gm sodium thiosulphate [affil. link to info/product on Amazon]/10 gm ammonium chloride/1 lit water. Dissolve nitrate in 50 gr water, add ammonium chloride dissolved in same amount of water, and then add thiosulphate dissolved in 900 ml water. Hope it helps and good luck!

Goran Budija
- Zagreb, Croatia



2005

Q. Please supply some instructions on the process of immersion silver coating from a silver nitrate bath and a reducing agent (2-part silvering solution). What is the reducing agent to be used? Is this a simple dipping process or is electrolysis still involved? Would this be a suitable process for making small repairs to the coating on silver plated items, due to wear or damage?

Philip Whitfield
Antiques - Johannesburg, South Africa

^-- Answer or Comment on this question --^

2005

A. If you wish to put an immersion silver deposit on suitable metals (which would probably be copper and brass), please see our FAQ on Silver Plating at Home for an explanation and a long list of consumer products that do this. This coating is very thin, but it is real silver and it does not require electricity. I do not know if these solutions are based on silver nitrate, sorry; but they are based on some salt of silver.

2-part silvering solutions are used to apply silver to glass and other non-conductive materials. The reducing agent can be formaldehyde (carcinogenic) or safer proprietaries.

Please consider securing a proprietary metallizing solution. It is dangerous to experiment with home-brew silvering solutions because of the possibility of creating and leaving behind remnants of explosive silver fulminates.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha



June 22, 2017
23519

Q. An expired US patent #3406107 titled "Non-cyanide silver plating bath" in 1964 by IBM, it stated a solution only with Sodium phosphate 10%, ammonium phosphate 2%, silver nitrate 1%, and the rest water, with a current density of 15-45 mA/in^2.

It also states that "The silver deposits have been found to be in an unstressed condition and the extremely good throwing power of such plating solution has made it highly desirable for plating irregularly shaped objects..."

Any expert(s) would think it will work with satisfactory results?

Walter Ka Wai Chu
BDNC - Hong Kong
^-- Answer or Comment on this question --^

July 24, 2017

A. Phosphate based silver plating baths had been developed in the 19th century...
(Leonhard Elsner: 'Die galvanische Vergoldung und Versilberung sowohl Matt als glänzend'. 3. Auflage. Amelang, Leipzig 1856 (1.edition 1843)!(http://reader.digitale-sammlungen.de/en/fs1/object/display/bsb10304766_00001.html)
Emanuel Schreiber: 'Vergoldungs- und Versilberungskunst durch Einlegen oder Anreiben'. Vogt, Weimar 1853 (http://reader.digitale-sammlungen.de/en/fs1/object/display/bsb11112267_00005.html)
Hope it helps and good luck!

Goran Budija
- Zagreb,Croatia


sidebar2 July 26, 2017

thumbs up sign Wow, an unexpected answer from Croatia, a nice country I really want to go to one of the islands...

Thanks! I just bought the chemical and will have a try when I have time, and let everybody know the result.

Walter Ka Wai Chu [returning]
BDNC - Hong Kong

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