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topic 8591

What is Sherardizing?



A discussion started in 1998 but continuing through 2020

2000

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

He was an Inventor!

Bye Love Minna

Minna Cowper-Coles
- England


2000

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

Regards,

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


2001

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


2001

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. 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



2001

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


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

Marc Green
Marc Green
anodizer - Boise, Idaho



To minimize search efforts and to offer multiple viewpoints, we combined previously separate threads onto this page. Please forgive any resultant repetition, failures of chronological order, or what may look like readers disrespecting previous responses -- those other responses may not have been on the page at the time :-)



1998 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

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.

Sincerely

Gerald W [last name deleted for privacy by Editor]
- Carrollton Georgia
^- Sorry, this RFQ is outdated
     View Current RFQs

----
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.



1998

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

Thanks in advance,
Truly yours

Arturo Casanova
- Mexico


2000

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



2000

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


2000

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


2002

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


2002

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



To minimize search efforts and to offer multiple viewpoints, we combined previously separate threads onto this page. Please forgive any resultant repetition, failures of chronological order, or what may look like readers disrespecting previous responses -- those other responses may not have been on the page at the time :-)



Zinc dust to metal parameters for sherardising

2001

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...

Thank

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


2006

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


2003

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


2004

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.

Regards,

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



2002

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


2002

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

Thanks,

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 :-)


2005

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

Sigve Bø
DiSTeK - NORWAY


2006

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

Dorian Shifman
- Scarsdale, New York


2006

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 to spec at Techstreet] salt spray test.

Roded Leviathan
- New York, New York


2007

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


December 28, 2008

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.

Regards,

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


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