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"Spray chroming with silver nitrate"

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Current question:

Ed. note: Please!
No abstract questions.
Huh?

November 22, 2021

Q. Good morning everyone. Please I'm needing an answer from an expert. How can I replace chloride tin by zinc chloride? Anyone here used this before? And what is the difference? Thank you.

Hakky victor
Inventor - North africa
^


November 2021

A. Hi Hakky. Marvin Sevilla says he's used it and it worked just as well. But please put your question into context by describing your situation. Thanks!

Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
^




Closely related Q&A's, oldest first:

2006

Q. I'm associated with trading of building materials in Dubai. I wanted to know if it's possible to metallize the surface of polystyrene with silver and the procedure for it ... any help in this regard will be highly appreciated

Ahmed Jawwad Ali
attractive building materials - UAE
^


2006

A. Yes, it is possible to metallize polystyrene but there are many severe limitations & handling restrictions. What are the dimensions of the items you are trying to metallize and what will be the specific end use? We need more information before describing a proper process. Thanks.

blake kneedler
Blake Kneedler
Feather Hollow Eng. - Stockton, California
^


2006

A. Dear Ahmed,

Silver tends to get dark after a while, depending on the air, moisture, and temperature. Thin layers of silver already become ugly after a week.
Silver is not a suitable metal for your plans.

It is much better to use a more stable metal; like gold.

Ruud Kooijman
- The Netherlands
^


2006

A. Polystyrene can be coated with silver and there are many ways of doing it. The problem comes in making it stick. The simplest way is to use polystyrene with about 5% butadiene in it and then etch the copolymer prior to electroless metallising. Alternatively you can use plasma etching to prepare the surface. The best way to do deposit the silver is by silver spray - the old silver mirror process. However, you need top provide more information about what you intend to do and its final end-use.

trevor crichton
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
^



2003

Q. Dear sirs
I recently came across a company in the course of my business that had sprayed a silver nitrate solution onto a piece of styrene having first primed with a PU filler. They then used an activator (Acid) which resulted in a superb chrome finish that was then washed over with distilled water before application of a finish coat of a clear PU lacquer. My question is have you come across this process and if so do you have an idea on how to achieve this. I have been trying for several months to find out more information on this process. The whole procedure was done with a conventional spray gun.

Yours sincerely,

Trevor Spinks
- Birmingham, West Midlands, UK
^


2003

A. Hi, Trevor,

This sounds like "two-part silvering" wherein silver nitrate and a reducing agent are simultaneously sprayed onto a surface to reduce a silver film onto it. You can probably research the technology successfully by searching for "Brashear process". Good luck.

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


August 19, 2009

A. I have recently got training and bought the system from a company in Shenzhen in China. The process is very simple. Just need the Silver Nitrate mixed with distilled water. Add 100 g Silver Nitrate in 20 Liters of distilled water called solution A; and make Solution B by mixing Ammonia in distilled water 1:20 and spray with a twin nozzle gun.

Base coat is PU, Spray chemicals named K and S wet-on-wet then A+B; and over coat can be PU or UV. You can make silver, gold and any metallic colour. The technology, spray machine and materials are available for sale in China.

Masood Tariq
- Lahore, Pakistan
^


April 22, 2011

Q. I want to know about silver spray plating technology by 5-gun machine. I read your article but I do not understand "S" wet on wet chemical. Kindly send me info on S chemical.

zarrar ahmad
plating shop - Delhi, India
^


"Polyurethane Sealants"
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April 23, 2011

A. Hi Zarrar,

There are many suppliers of chrome-look paints, including the advertisers who make this site possible and who are shown in the banner at the bottom of the page. You can correspond directly with them if you wish.

But this discussion has mixed together a generic discussion of spray finish silvering, with specific instructions from one particular Chinese brand, so it is getting confusing. It sounds like parts K and S of that particular system together comprise a two-pack base coat before the silvering. "Wet-on-wet" simply means that one part is sprayed first, and then the second part is sprayed on before the first part has dried.

Regards,

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


June 14, 2011

Q. I want to know what is the k and s, which is used in the silver spray plating?

ankit adeshra
plating shop - baroda
^


June 14, 2011

A. Hi, Ankit. Masood explained what k and s meant to him, which I tried to clarify for Zarrar.

It's always difficult to know what shorthand or slang someone is referring to without the complete context.

Still, I'd go with Masood's explanation that they are letters assigned to the two components of a polyurethane base coat by their Chinese manufacturer. You can learn more about this from the wikipedia entry on polyurethanes at en.wikipedia.org/wiki/Polyurethane, or by googling for "two-component wet-on-wet polyurethane". Good luck.

Regards,

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



August 7, 2016

Q. Hi,
Can you please give me some information on tin II chloride dihydrate perfect mixture? Because I'm so sure my mixture on this is having problems. The silver reaction is very slow, yellowish, non stick. My mixture is 5 g/L tin, 10 mL HCl and D.I. water.
Please help.
Thanks

Andy Tan
- Malaysia, penang
^


August 2016
wikipedia
Tin II dihydrate

A. Hi Andy. Sorry, I do not even know whether tin II chloride dihydrate is a good reducing agent for this particular silvering operation or not.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
^


August 7, 2016

A. Hi Andy
Any chloride or hydrochloric acid will react with silver nitrate to give a precipitate of silver chloride. It is a standard test for chlorides.
Reducing silver nitrate to produce a silver deposit requires handling strong and potentially hazardous chemicals.
If you do not fully understand the chemistry it would be better to find an alternative process.

geoff smith
Geoff Smith
Hampshire, England
^


August 9, 2016

thumbs up signHi Mr.Geoff,
Thanks for your information. I has successfully found out the problems and at the same time success my formula by using tin II chloride dihydrate and HCl.

Once again, thanks guys

Andy Tan [returning]
- Malaysia penang
^


August 18, 2016

Q. Hi,
I have a question.
1. How to make my silvering chrome looks whiter and shine?
2. What is the name of chemical when spray on it for easy to blow off the water?

thanks

Andy Tan [returning]
- Malaysia penang
^


wikipedia
Isopropyl_alcohol
September 2016

Hi Andy.
2. Either isopropyl alcohol or mild detergents like sodium lauryl sulphate can improve rinsing.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
^


September 26, 2016

A. Tin II Chloride in this process or any Spray Silvering process is to seed the non conductive surface with an active metal that will make the reduced silver stick to it and form the silver mirror, it's prepared by mixing about 5 grams of Tin II Chloride with 25 ml of HCI then adding about 1 L of deionized Water (DI Water); after the piece has been degreased, and its surface tension has been lowered (wetting agent) the sensitizer will be sprayed and allowed to seed the surface for at least one minute but no more than 3 minutes.

Some call it sensitizer or Activator, I have used Zinc Chloride (zinc oxide + HCl) and Magnesium Chloride (salts from the pharmacy) and they have worked just as good.

Marvin Sevilla
- Managua, Nicaragua
^


September 27, 2016

Q. Hi,
Thanks for the information.
And how to make silver look like white platinum gold after the silver been done? Any idea what to add in the silver?

Thanks

Andy Tan [returning]
- Malaysia pg
^


A. Hi Andy. Companies like G.J. Nikolas [a finishing.com supporting advertiser] offer tinted topcoats like you seem to be talking about. If you want to do your own tinting of topcoats you probably have to do some reading on paint formulation.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
^



January 16, 2017

Q. Hi,
Can you please teach/show me the steps/how to re-spray on chrome without removing the faulty chrome?
(Example: peel off touched by finger after spray or some area not turning into chrome).

Thanks

Andy Tan [returning]
- Malaysia, Penang
^


January 18, 2017

A. If the Silvering did not go well(many reasons for that), what I do is use dilute ferric chloride, clean very well and start again.

But if this happened after the silvering has been clear coat it, then you must wait for the clear to fully cure and start from that as a base.

Marvin Sevilla
- Managua, Nicaragua.
^


January 22, 2017

thumbs up signThanks a lot..

Andy Tan [returning]
- Malaysia, Penang
^


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