Mechanical Engineering - Workshop Technology - Discussion

2. 

A zinc diffusion process is called

[A]. galvanising
[B]. anodising
[C]. parkerising
[D]. sherardizing

Answer: Option D

Explanation:

No answer description available for this question.

Amos Danstan Mtogwa said: (May 22, 2013)  
Who this process of sheradizing take place?

Ramesh said: (Dec 20, 2013)  
What is sherardizing?

Nalls said: (Dec 23, 2013)  
Sherardising or sherardizing is a method of galvanising also called vapour galvanising. It is named for its discoverer Sherard Cowper-Coles (1900). Zinc evaporates and diffuses into the metal target object forming Zn-Fe-phases by heating the object in an airtight container with zinc powder.

Chiradeep Bhattacharya said: (Jan 28, 2014)  
Sherardising or sherardizing is a method of galvanising also called vapour galvanising. It is named for its discoverer Sherard Cowper-Coles (1900). Zinc evaporates and diffuses into the metal target object forming Zn-Fe-phases by heating the object in an airtight container with zinc powder. The temperature that the container reaches normally does not exceed the melting point of zinc. Another method of sherardisation is to expose the intended objects to vapour from molten zinc using a reducing gas to prevent oxidation.

Sherardising is ideal for small parts and parts that require coating of inner surfaces, such as batches of small items.

Shailendra Daf said: (Feb 9, 2014)  
I think answer is tie between Galvanizing and sherardizing because both are zinc coating process.

Jayesh Beldar said: (Apr 6, 2014)  
Erardizing is a thermal diffusion process and involves placing the pre-cleaned components to be coated into a container, along with a distribution media and a calculated mass of zinc powder.

The container is sealed and placed into a furnace which is raised to a temperature of between 330°C and 425°C in order to vaporise the zinc, allowing it to form an alloy with the substrate. At the same time, the container is rotated for a pre-determined length of time, usually between 2- 4 hours.

The resultant Sherardized coating is smooth, matt grey in appearance and uniform in thickness, the normal range being between 15 to 80 µm, although thicker coatings up to 100 µm are possible.

Trivendra Kumar said: (Dec 23, 2015)  
What is galvanizing?

Chanchal Tripthi said: (Feb 2, 2016)  
Galvanising is the process of applying a coating of zinc to steel, in order to protect it against corrosion. The most common method used for the majority of sizes of steel members or fabrications is hot dip galvanising which involves the entire immersion of the steel product into a bath of molten zinc.

Iswarya said: (Feb 8, 2016)  
If it's sherardizing and galvanising then what should be the answer?

Ratan said: (Apr 17, 2016)  
Why not Galvanizing?

Ranajay said: (May 3, 2016)  
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 degree C.

Rahul Ramesh said: (Jul 21, 2016)  
Sherardizing is a process of galvanization of ferrous metal surfaces, also called vapour galvanising and dry galvanizing.

Normal galvanizing is a different process, diffusion doesn't take place there.

Ranjo said: (Sep 19, 2016)  
What is the correct answer?

Laxman Bawankule said: (Sep 23, 2016)  
Sherardizing provides a zinc diffusion coating on iron or copper based materials.

Mohan Chouhan Gptw said: (Feb 19, 2017)  
Sherardizing is the diffusion process and galvanising is the coating process both zinc oriented but different.

Amol Malode said: (Jun 14, 2017)  
Sherardizing is a process of galvanization of ferrous metal surfaces, also called vapour galvanising and dry galvanising. The process is named after the British metallurgist Sherard Osborn Cowper-Coles (son of naval inventor Cowper Phipps Coles) who invented and patented the method ca. 1900. This process involves heating the steel parts up to ca.500°C in a closed rotating drum that also contains metallic zinc dust and possibly an inert filler, such as sand. At temperatures above 300°C, zinc evaporates and diffuses into the steel substrate forming diffusion bonded Zn-Fe-phases.

Sherardizing is ideal for small parts and parts that require a coating of inner surfaces, such as batches of small items. Part size is only limited by the drum size. It is reported that pipes up to 6 m in length for the oil industry are sherardized. [citation needed] If the metal surface is free of scale or oxides, no pretreatment is needed. The process is hydrogen free, therefore a hydrogen embrittlement is excluded.

Lokesh said: (Nov 29, 2017)  
What about the parkerising process?

Kiran said: (Feb 15, 2018)  
What is sherardizing?

Vivek said: (Apr 20, 2018)  
Sherardizing is a process of galvanization of ferrous metal surfaces, also called vapour galvanising and dry galvanizing. The process is named after the British metallurgist Sherard Osborn Cowper-Coles (son of naval inventor Cowper Phipps Coles) who invented and patented the method ca. 1900. This process involves heating the steel parts up to ca. 500°C in a closed rotating drum that also contains metallic zinc dust and possibly an inert filler, such as sand. At temperatures above 300°C, zinc evaporates and diffuses into the steel substrate forming diffusion bonded Zn-Fe-phases.

Sherardising is ideal for small parts and parts that require a coating of inner surfaces, such as batches of small items. Part size is only limited by the drum size. It is reported that pipes up to 6 m in length for the oil industry are sherried. If the metal surface is free of scale or oxides, no pretreatment is needed. The process is hydrogen free, therefore a hydrogen embrittlement is excluded.

Azuu said: (Dec 18, 2018)  
Sherardizing is a process of galvanization of ferrous metal surfaces, also called vapour galvanising and dry galvanizing. The process is named after the British metallurgist Sherard Osborn Cowper-Coles (son of naval inventor Cowper Phipps Coles) who invented and patented the method ca. 1900. This process involves heating the steel parts up to ca. 500°C in a closed rotating drum that also contains metallic zinc dust and possibly an inert filler, such as sand. At temperatures above 300°C, zinc evaporates and diffuses into the steel substrate forming diffusion bonded Zn-Fe-phases.

Dilip said: (Mar 11, 2019)  
What is the Difference between Sherardizing and galvanising? Explain.

Sai said: (Apr 7, 2019)  
Why sherardising is ideal for small articles?

Post your comments here:

Name *:

Email   : (optional)

» Your comments will be displayed only after manual approval.