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What is Sherardizing?


thumbs up signMy Great great Grandpa, or something, invented Sherardizing.

He was an Inventor!

Bye Love Minna

Minna Cowper-Coles
- England


The surface finishing industry hopes you will be following in his footsteps, Minna.smiley face


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

Q. Hello

Will anybody help me please? I have been waiting for a reply but none have been forthcoming!

I am an engineering student of north lindsey college England and am currently doing an assignment on corrosion of metals and the treatments that prevent these corrosions! The name of sherardizing has cropped up and I am wondering where I can find information on this process as I am currently unable to find an amount of quality information!

Daniel Mawbey
Student - Goole, England

A. I am also a motor engineering student in Devon. I have found a bit of info on sherardizing. Sherardizing is a diffusion process in which articles are heated in the presence of zinc dust [on eBay or Amazon affil link] . The process is normally carried out in a slowly rotating closed container at temperatures ranging from 320-500 °C Hope this helps.

Matthew Davis
- Newton, Abbot

Q. What is sherardizing?

Tim Cook
- Scunthorpe, England

A. It is apparently a finishing process that nobody but the British are interested in :-)

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

thumbs up sign Bravo, Ted.. that was too damned funny!

Marc Green
Marc Green
anodizer - Boise, Idaho

Multiple threads were merged: please forgive repetition, chronology errors, or disrespect towards other postings [they weren't on the same page] :-)

Q. Dear Sirs:

I am looking for information on the Sherardizing process and also a shop in the southeast capable of performing this process on finished machine parts. Please advise.


Gerald W [last name deleted for privacy by Editor]
- Carrollton Georgia

Ed. note: Sorry, this RFQ is outdated so private contact is no longer available, but public technical replies are still welcome! No public brand/source suggestions please ( huh? why?)

Ed. note: We deleted the many RFQs we've received for Sherardizing shops & consultants over the years as they are no longer of current interest. But we left this one so readers could realize that people have been looking for this process since at least 1998.

Q. I'm looking for a book related to the Sherardizing process and I didn't find any specific book in your page. Could you help me to find some good ones?

Thanks in advance,
Truly yours

Arturo Casanova
- Mexico

Q. I am looking for some technical information about sherardising. What is sherardising all about and how does the application work?

Could one say that a zinc galvanised steel products (anchor, plugs) with additional sherardising process is as good or even better than hot dip galvanised steel products?

Werner B [last name deleted for privacy by Editor]
- Singapore

Q. We are trying to obtain some business that is currently being manufactured in England. One of the processes that are used is "Sherardising". We have very little knowledge about the process and why it is used. Can anyone steer us in the right direction?

And is there a substitute process available in the USA?

Phillip Roberts
- Grandview, Missouri

A. Keystone Steel & Wire in Peoria IL does some Sherardizing. The process consists of tumbling small parts with sand, flux, and zinc dust and heating it until the zinc fuses to the surface of the part, followed by a quench.

Tom Rochester
CTO - Jackson, Michigan, USA
Plating Systems & Technologies, Inc.
supporting advertiser
plating systems & technologies banner ad

A. Sherardising, it is called. I work in a small company that sherardizes. It is a method not known very well. In 1901 Sherard Cooper founded this method in England. You put metal products, sand and zinc dust in a closed iron box. This box you put in an oven an heat it until about 410 °C. At about 380 °C. the zinc dust will melt into/onto the metal products that has to be sherardized. This method has a lot of positive things. It is better harmed to corrosion, salt spray test results are better than galvanized. In Europe only a few companies use this method. In The Netherlands one, Germany one, France two and England two or three companies. In other countries, I don't know. In US, I don't know.

You don't have to seek a company that makes equipment. You will not find anyone. Just make the equipment yourself. If you need the machines you want, just go to a constructor and tell your wishes. The owner just developed some machines, and some he could buy.

Leon Kloor
- Helmond, The Netherlands

Q. Leon,

I was interested in your response. I work for a small company in Australia that uses sherardising for chain components and railway clips. There is not a lot that I can find out about the subject apart from information in British and Dutch standards. One of the things that I'm interested in is the type of sand used (material, size, etc.) Can you tell me what type of sand is used and why?

Karl Keesman
- Blackburn, Victoria, Australia

Multiple threads were merged: please forgive repetition, chronology errors, or disrespect towards other postings [they weren't on the same page] :-)

zinc dust to metal parameters for sherardising

Q. Hello

I would like to know the proportion of zinc dust /metal in the sherardising. We designed a line of sherardising but we found anything on the subject. For example, we find that for 400 kg of metal, we would need only 12 kg of zinc. But the theory and the practice are quite different...


Yohan T [last name deleted for privacy by Editor]
- Quebec, Canada

A. The simple answer to your question is that it depends. The zinc requirement depends on the surface area of the product you coat. The smaller the coated item is the more zinc you'll require. The larger it is the less zinc you'll require.
To be more specific, I'm familiar with a new Sherardizing system, and they use about 2%-9% zinc proportional to the weight of the coated items, i.e. if you coat small parts then you'll use 36 kg zinc for 400 kg steel, however, if you do larger parts you'll use 8kg zinc for 400 kg steel.

Dorian Shifman
- Charlotte, North Carolina


A. Up to my knowledge sand is used for distribution of heat. Some two thirds of the drum have to be filled by steel or sand.

Q. Who knows something about physical basics as diffusion coefficients or metallurgic analysis of the layer. Thanks for answering.

norbert seyfert
Dr. Norbert Seyfert
surface development - Olpe, Germany

A. Hi Arturo. Hi Phillip.
The March 2004 edition of Metal Finishing Magazine contains an article by Dr. Benu Chatterjee on sherardizing, page 40. There are a number of used and inexpensive books about Sherardizing at this link at Amazon.


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

Q. I would like to know about the corrosion resistance of sherardized parts. I have heard there is this new technology called sherardizing 2000 which can withstand up to 500 hours in the salt spray test. Has anyone heard about DiAv-93? It is a patented process of thermodiffusion galvanizing developed in Israel by Distek Ltd. They say it is similar to sherardizing in application, yet superior in corrosion resistance.

Sena Kiray
- Istanbul, Turkey


Q. I'm aware of rumors about Distek, but I find a lack of information. Maybe someone can help me?


norbert seyfert
Dr. Norbert Seyfert
surface development - Olpe, Germany

Ed. note-- Readers: to the extent practical, please try to keep this discussion about generic metal finishing technologies like sherardizing/thermodiffusion rather than purported advantages of a brand, a source, or a proprietary (why?)
Also, bear in mind that salt spray testing of galvanizing can be quite silly because its corrosion resistance depends upon the development of glassy tenacious self-sealing zinc carbonate corrosion products over the months & years. In practice, hot dip galvanizing can often last 50-75, even 100 years without maintenance whereas it rapidly dissolves away in a salt spray cabinet :-)

A. Dear Sir,

Distek is an Israeli company who designs and sells lines for thermodiffusion zinc coating. Distek has today a better technology than Sherardising, but in principle it is the same technology of thermodifussion coating.

Best regards

Sigve Bø

A. You can try Distek web site or just google "Distek thermo diffusion".

Dorian Shifman
- Scarsdale, New York

A. I'm very familiar with this system. I know that DiSTeK® coated product is being sold under their American trademark UnStain® 1500 and is guaranteed for 1000 hours in ASTM B117 [affil link] salt spray test.

Roded Leviathan
- New York, New York

A. I know that DiSTeK is the owner of the DiAv-93 process and that their American subsidiary have test results by independent 3rd parties, such as US EPA, Michigan State University, and Dade County (FL) approved lab. Their American company posts the test results on their web site. I am sure that through a search on Google you can find the information. Or you can contact them and they will send you copies of these test results.

Dorian Shifman
- Scarsdale, New York

A. Hi, Sena. Hi, Norbert.

1. If you search our site for "sherardizing" you will find several threads on what it is and its history.
2. The March 2004 edition of Metal Finishing Magazine contains an article by Dr. Benu Chatterjee on sherardizing, page 40.
3. Distek NA can probably help you with your questions or refer you to the proper contacts in Turkey.
4. You may wish to listen to our podcast interview with Martin Straus of Chemplate Industries about Sherardizing and the DiSTeK® process.


Ted Mooney,
Ted Mooney, P.E.
Striving to live Aloha - Pine Beach, New Jersey
December 28, 2008

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