Galvanising - Revision history

Editor at 19:11, 6 July 2021

2021-07-06T19:11:58Z

← Older revision		Revision as of 19:11, 6 July 2021
Line 56:		Line 56:
	* Galvanised steel.		* Galvanised steel.
	* Rust.		* Rust.
		+	* Spangle.
	* Stainless steel vs. galvanised steel.		* Stainless steel vs. galvanised steel.
	* Steel.		* Steel.

Designing Buildings at 06:55, 6 July 2021

2021-07-06T06:55:52Z

← Older revision		Revision as of 06:55, 6 July 2021
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	== Sherardising ==		== Sherardising ==

−	Sherardising a form of thermal diffusion galvanising that provides a zinc diffusion coating on iron- or copper-based materials. It is sometimes used for small articles such as bolts, nuts, chains, valves and so on.	+	Sherardising is a form of thermal diffusion galvanising that provides a zinc diffusion coating on iron- or copper-based materials. It is sometimes used for small articles such as bolts, nuts, chains, valves and so on.

−	~~Sherardising~~ is a process for forming intermetallic compounds of iron and zinc on a ~~steel~~ surface by heating it in the presence of zinc dust below the melting point of the zinc. This heating is ~~done~~ in a sealed container that is packed with zinc dust and continuously rotated.	+	It is a process for forming intermetallic compounds of iron and zinc on a surface by heating it in the presence of zinc dust below the melting point of the zinc. This heating is carried out in a sealed container that is packed with zinc dust and continuously rotated.

	== The Sendzimir process ==		== The Sendzimir process ==

−	Named ~~for~~ the Polish-American engineer and inventor, Tadeusz Sendzimir (1894 -1989) the Sendzimir process uses a small amount of aluminium in a zinc bath to create a durable and highly resistant coating that has very little iron-zinc alloy. It is sometimes used to galvanise steel strip.	+	Named after the Polish-American engineer and inventor, Tadeusz Sendzimir (1894 -1989) the Sendzimir process uses a small amount of aluminium in a zinc bath to create a durable and highly resistant coating that has very little iron-zinc alloy. It is sometimes used to galvanise steel strip.

−	In the Sendzimir process, the strip is unwound from a coil and the oil or grease adhering to it is removed by oxidation through heating. In the next stage, the strip is annealed and the oxides are reduced by ammonia. Then follows cooling (to approximately 500°C) and immersion of the strip in the zinc bath, which is kept molten at about 450°C by the temperature of the steel strip. On leaving the bath, the strip is cut or coiled.	+	In the Sendzimir process, the strip is unwound from a coil and the oil or grease adhering to it removed by oxidation through heating. In the next stage, the strip is annealed and the oxides are reduced by ammonia. Then follows cooling (to approximately 500°C) and immersion of the strip in the zinc bath, which is kept molten at about 450°C by the temperature of the steel strip. On leaving the bath, the strip is cut or coiled.

	= Related articles on Designing Buildings Wiki =		= Related articles on Designing Buildings Wiki =

Designing Buildings at 06:53, 6 July 2021

2021-07-06T06:53:39Z

← Older revision		Revision as of 06:53, 6 July 2021
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	= Introduction =		= Introduction =

−	Galvanising or galvanisation is the process of applying a protective zinc coating to steel or iron to prevent rusting.	+	Galvanising or galvanisation is the process of applying a protective zinc coating to steel or iron to prevent rusting. Outside of the built environment, "to galvanise" is also associated with providing the motivation for a person (or group of people) to get ready to act.

−	Outside of the built environment, "to galvanise" is associated with providing the motivation for a person (or group of people) to get ready to act. In the construction context, the term has largely come to be associated with zinc coatings. The use of galvanised steel in construction is one of the most common applications of this process.	+	Steel items are frequently galvanised as a form of protection from deterioration often caused by weather and decay over time. The galvanising technique is used for items such as steel frames for buildings, balconies, staircases, ladders, walkways, street furniture as well as products such as bars, tubes, wire and sheet. It is also used on common household items such as buckets, watering cans, bins and so on.
−		+
−	Steel items are frequently galvanised as a form of protection from deterioration often caused by weather and decay over time. The galvanising technique is used for items such as steel frames for buildings, balconies, staircases, ladders, walkways, street furniture as well as products such as bars, tubes~~, strips~~, wire and sheet. It is also used on common household items such as buckets, watering cans, ~~wash tubs, garbage cans~~ and so on.	+

	For more information, see Galvanised steel.		For more information, see Galvanised steel.
Line 13:		Line 11:
	= History =		= History =

−	There are early examples of galvanising in the 17th century. However, the term is named ~~for~~ the Italian physicist and biologist, Luigi Galvani (1737 – 1798) who ~~had no direct connection to~~ the ~~zinc coating process~~.	+	There are early examples of galvanising in the 17th century. However, the term itself is named after the Italian physicist and biologist, Luigi Galvani (1737 – 1798) whose work with electricity was explored further by another Italian, Alessandro Volta (1745 – 1827). Volta was a professor of experimental physics who examined the relationship between the generation of an electrical current caused by a chemical action.

−	~~Galvani’s work with electricity~~ was ~~explored further by another Italian~~, ~~Alessandro Volta~~ (~~1745 – 1827~~). ~~Volta~~ was ~~a professor~~ of ~~experimental physics who examined~~ the ~~relationship between~~ the ~~generation of an electrical current caused by a chemical action~~.	+	In its original context, galvanisation was the process of stimulating one thing (in Galvani’s case, a dead frog’s leg) into action (again, in Galvani’s case with the frog, it was brass electrodes and atmospheric electricity). The process of galvanising was thought to be one of the inspirations for the writer Mary Shelley in her novel, Frankenstein.

−	In its original context, galvanisation was applied to the concept of stimulating one thing (in Galvani’s case, a dead frog’s leg) into action (again, in Galvani’s case with the frog, it was brass electrodes and atmospheric electricity). The process of galvanising was thought to be one of the inspirations for the writer Mary Shelley in her novel, Frankenstein.	+	In 1837, the Frenchman Stanislas Sorel picked up the term "galvanise" and applied it to his patented galvanic paint. This was the earliest form of the galvanising process as a type of protective coating.
−		+
−	In 1837, the Frenchman Stanislas Sorel picked up the term "galvanise" ~~(despite it being unrelated)~~ and applied it to his patented galvanic paint. This was the earliest form of the galvanising process as a type of protective coating.	+

	= Methods of galvanisation =		= Methods of galvanisation =

−	There are several methods of galvanising. Hot-dip is the most common, but there is also sheradising and the Sendzimir process~~. Less widely used methods include~~ electrogalvanising and metal spraying.	+	There are several methods of galvanising. Hot-dip is the most common, but there is also sheradising and the Sendzimir process, electrogalvanising and metal spraying.

	== Hot-dip galvanising ==		== Hot-dip galvanising ==

−	Hot-dip gavanising is the process in which the zinc coating is created through the immersion of ~~materials or articles~~ in a bath of molten zinc. The zinc combines with the iron to form iron and zinc alloy crystals. This provides a coating that is firmly adhered to the surface.	+	Hot-dip gavanising is the process in which the zinc coating is created through the immersion of items in a bath of molten zinc. The zinc combines with the iron to form iron and zinc alloy crystals. This provides a coating that is firmly adhered to the surface.
		+
		+	The characteristic crystalline surface patterns presented by hot-dip coatings are known as spangles; their size and shape are influenced by the surface condition of the steel, the impurities present in the bath, the rate of cooling and other factors.

−	~~The characteristic crystalline surface patterns presented by~~ hot-dip ~~coatings are known as spangles; their size and shape are influenced by~~ the ~~surface condition~~ of ~~the steel~~, ~~the impurities present in the bath~~, ~~the rate of cooling and other factors. Less widely used zinc-coating processes are electrogalvanising~~, ~~metal spraying~~ and ~~sheradising~~.	+	For successful hot-dip galvanisaing, the steel must be free of oil, grease, dirt, scale and corrosion.

−	~~For successful hot-dip galvanisaing, the steel must be free of oil, grease, dirt, scale and corrosion products.~~ Preparatory treatment may require some or all of these steps	+	Preparatory treatment may require some or all of these steps:

	* Degreasing with a suitable solvent.		* Degreasing with a suitable solvent.
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	In wet galvanising, the flux is deposited in molten form on the zinc bath. The metal to be galvanised is introduced into the bath through the layer of flux.		In wet galvanising, the flux is deposited in molten form on the zinc bath. The metal to be galvanised is introduced into the bath through the layer of flux.

−	In dry galvanizing, the metal components are first dipped in a solution of flux and are then dried so they become ~~precoated~~ with a thin film of flux which melts in the zinc bath. The molten zinc bath is kept at a temperature of 450°C to 470°C. ~~Certain metals~~ (such as tin and aluminium) may be added to the bath to produce ~~certain~~ characteristics. For instance, tin imparts a brightness to the coated metal.	+	In dry galvanizing, the metal components are first dipped in a solution of flux and are then dried so they become pre-coated with a thin film of flux which melts in the zinc bath. The molten zinc bath is kept at a temperature of 450°C to 470°C. Metals (such as tin and aluminium) may be added to the bath to produce specific characteristics. For instance, tin imparts a brightness to the coated metal.

	== Sherardising ==		== Sherardising ==

Editor at 17:32, 5 July 2021

2021-07-05T17:32:10Z

← Older revision		Revision as of 17:32, 5 July 2021
Line 52:		Line 52:
	Named for the Polish-American engineer and inventor, Tadeusz Sendzimir (1894 -1989) the Sendzimir process uses a small amount of aluminium in a zinc bath to create a durable and highly resistant coating that has very little iron-zinc alloy. It is sometimes used to galvanise steel strip.		Named for the Polish-American engineer and inventor, Tadeusz Sendzimir (1894 -1989) the Sendzimir process uses a small amount of aluminium in a zinc bath to create a durable and highly resistant coating that has very little iron-zinc alloy. It is sometimes used to galvanise steel strip.

−	~~The~~ Sendzimir process ~~is used for~~ the ~~galvanising of steel strip. The~~ strip is unwound from a coil~~. The~~ oil or grease adhering to it is ~~then~~ removed by oxidation through heating. In the next stage, the strip is annealed and the oxides are reduced by ammonia. Then follows cooling (to approximately 500°C) and immersion of the strip in the zinc bath, which is kept molten at about 450°C by the temperature of the steel strip. On leaving the bath, the strip is cut or coiled.	+	In the Sendzimir process, the strip is unwound from a coil and the oil or grease adhering to it is removed by oxidation through heating. In the next stage, the strip is annealed and the oxides are reduced by ammonia. Then follows cooling (to approximately 500°C) and immersion of the strip in the zinc bath, which is kept molten at about 450°C by the temperature of the steel strip. On leaving the bath, the strip is cut or coiled.

	= Related articles on Designing Buildings Wiki =		= Related articles on Designing Buildings Wiki =

Editor at 17:29, 5 July 2021

2021-07-05T17:29:04Z

← Older revision		Revision as of 17:29, 5 July 2021
Line 59:		Line 59:
	* Rust.		* Rust.
	* Stainless steel vs. galvanised steel.		* Stainless steel vs. galvanised steel.
		+	* Steel.
	* Super-strength steel structures.		* Super-strength steel structures.
	* Wall tie failure.		* Wall tie failure.

Editor at 17:28, 5 July 2021

2021-07-05T17:28:16Z

← Older revision		Revision as of 17:28, 5 July 2021
Line 56:		Line 56:
	= Related articles on Designing Buildings Wiki =		= Related articles on Designing Buildings Wiki =

−	* Galvanised steel	+	* Galvanised steel.
	* Rust.		* Rust.
		+	* Stainless steel vs. galvanised steel.
	* Super-strength steel structures.		* Super-strength steel structures.
	* Wall tie failure.		* Wall tie failure.

Editor at 17:27, 5 July 2021

2021-07-05T17:27:17Z

← Older revision		Revision as of 17:27, 5 July 2021
Line 1:		Line 1:
−	[[File:GalvanisedSheet.jpg]]	+	[[File:GalvanisedSheet.jpg\|link=File:GalvanisedSheet.jpg]]

	= Introduction =		= Introduction =
Line 5:		Line 5:
	Galvanising or galvanisation is the process of applying a protective zinc coating to steel or iron to prevent rusting.		Galvanising or galvanisation is the process of applying a protective zinc coating to steel or iron to prevent rusting.

−	The use of galvanised steel in construction is one of the most common applications of this process. Steel items are frequently galvanised as a form of protection from deterioration often caused by weather and decay over time. The galvanising technique is used for items such as steel frames for buildings, balconies, staircases, ladders, walkways, street furniture as well as products such as bars, tubes, strips, wire and sheet. It is also used on common household items such as buckets, watering cans, wash tubs, garbage cans and so on.	+	Outside of the built environment, "to galvanise" is associated with providing the motivation for a person (or group of people) to get ready to act. In the construction context, the term has largely come to be associated with zinc coatings. The use of galvanised steel in construction is one of the most common applications of this process.
		+
		+	Steel items are frequently galvanised as a form of protection from deterioration often caused by weather and decay over time. The galvanising technique is used for items such as steel frames for buildings, balconies, staircases, ladders, walkways, street furniture as well as products such as bars, tubes, strips, wire and sheet. It is also used on common household items such as buckets, watering cans, wash tubs, garbage cans and so on.
		+
		+	For more information, see Galvanised steel.

	= History =		= History =
Line 13:		Line 17:
	Galvani’s work with electricity was explored further by another Italian, Alessandro Volta (1745 – 1827). Volta was a professor of experimental physics who examined the relationship between the generation of an electrical current caused by a chemical action.		Galvani’s work with electricity was explored further by another Italian, Alessandro Volta (1745 – 1827). Volta was a professor of experimental physics who examined the relationship between the generation of an electrical current caused by a chemical action.

−	In its original context, galvanisation was applied to the concept of stimulating one thing (in Galvani’s case, a dead frog’s leg) into action (again, in Galvani’s case with the frog, it was brass electrodes and atmospheric electricity). The process of galvanising was thought to be one of the inspirations for the writer Mary Shelley in her ~~work~~, Frankenstein.	+	In its original context, galvanisation was applied to the concept of stimulating one thing (in Galvani’s case, a dead frog’s leg) into action (again, in Galvani’s case with the frog, it was brass electrodes and atmospheric electricity). The process of galvanising was thought to be one of the inspirations for the writer Mary Shelley in her novel, Frankenstein.

−	Outside of the built environment, to galvanise is associated with providing the motivation for a person (or group of people) to get ready to act. In modern usage, the term "galvanizing" has largely come to be associated with zinc coatings,	+	In 1837, the Frenchman Stanislas Sorel picked up the term "galvanise" (despite it being unrelated) and applied it to his patented galvanic paint. This was the earliest form of the galvanising process as a type of protective coating.
−		+
−	In 1837, the Frenchman Stanislas Sorel picked up the term galvanise (despite it being unrelated) and applied it to his patented galvanic paint. This was the earliest form of the galvanising process as a type of protective coating.	+

	= Methods of galvanisation =		= Methods of galvanisation =
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	* Wall tie failure.		* Wall tie failure.
	* Zinc in construction.		* Zinc in construction.
		+
		+	[[Category:DCN_Definition]] [[Category:DCN_Product_Knowledge]] [[Category:Definitions]] [[Category:Construction_techniques]] [[Category:Products_/_components]]

Editor: Created page with "File:GalvanisedSheet.jpg = Introduction = Galvanising or galvanisation is the process of applying a protective zinc coating to steel or iron to prevent rusting. The use of..."

2021-07-05T17:21:55Z

Created page with "File:GalvanisedSheet.jpg = Introduction = Galvanising or galvanisation is the process of applying a protective zinc coating to steel or iron to prevent rusting. The use of..."

New page

[[File:GalvanisedSheet.jpg]]

= Introduction =

Galvanising or galvanisation is the process of applying a protective zinc coating to steel or iron to prevent rusting.

The use of galvanised steel in construction is one of the most common applications of this process. Steel items are frequently galvanised as a form of protection from deterioration often caused by weather and decay over time. The galvanising technique is used for items such as steel frames for buildings, balconies, staircases, ladders, walkways, street furniture as well as products such as bars, tubes, strips, wire and sheet. It is also used on common household items such as buckets, watering cans, wash tubs, garbage cans and so on.

= History =

There are early examples of galvanising in the 17th century. However, the term is named for the Italian physicist and biologist, Luigi Galvani (1737 – 1798) who had no direct connection to the zinc coating process.

Galvani’s work with electricity was explored further by another Italian, Alessandro Volta (1745 – 1827). Volta was a professor of experimental physics who examined the relationship between the generation of an electrical current caused by a chemical action.

In its original context, galvanisation was applied to the concept of stimulating one thing (in Galvani’s case, a dead frog’s leg) into action (again, in Galvani’s case with the frog, it was brass electrodes and atmospheric electricity). The process of galvanising was thought to be one of the inspirations for the writer Mary Shelley in her work, Frankenstein.

Outside of the built environment, to galvanise is associated with providing the motivation for a person (or group of people) to get ready to act. In modern usage, the term "galvanizing" has largely come to be associated with zinc coatings,

In 1837, the Frenchman Stanislas Sorel picked up the term galvanise (despite it being unrelated) and applied it to his patented galvanic paint. This was the earliest form of the galvanising process as a type of protective coating.

= Methods of galvanisation =

There are several methods of galvanising. Hot-dip is the most common, but there is also sheradising and the Sendzimir process. Less widely used methods include electrogalvanising and metal spraying.

== Hot-dip galvanising ==

Hot-dip gavanising is the process in which the zinc coating is created through the immersion of materials or articles in a bath of molten zinc. The zinc combines with the iron to form iron and zinc alloy crystals. This provides a coating that is firmly adhered to the surface.

The characteristic crystalline surface patterns presented by hot-dip coatings are known as spangles; their size and shape are influenced by the surface condition of the steel, the impurities present in the bath, the rate of cooling and other factors. Less widely used zinc-coating processes are electrogalvanising, metal spraying and sheradising.

For successful hot-dip galvanisaing, the steel must be free of oil, grease, dirt, scale and corrosion products. Preparatory treatment may require some or all of these steps

* Degreasing with a suitable solvent.
* Pickling with acid (to remove any oxide film).
* Rinsing and drying.
* Treating with a flux.

In wet galvanising, the flux is deposited in molten form on the zinc bath. The metal to be galvanised is introduced into the bath through the layer of flux.

In dry galvanizing, the metal components are first dipped in a solution of flux and are then dried so they become precoated with a thin film of flux which melts in the zinc bath. The molten zinc bath is kept at a temperature of 450°C to 470°C. Certain metals (such as tin and aluminium) may be added to the bath to produce certain characteristics. For instance, tin imparts a brightness to the coated metal.

== Sherardising ==

Sherardising a form of thermal diffusion galvanising that provides a zinc diffusion coating on iron- or copper-based materials. It is sometimes used for small articles such as bolts, nuts, chains, valves and so on.

Sherardising is a process for forming intermetallic compounds of iron and zinc on a steel surface by heating it in the presence of zinc dust below the melting point of the zinc. This heating is done in a sealed container that is packed with zinc dust and continuously rotated.

== The Sendzimir process ==

Named for the Polish-American engineer and inventor, Tadeusz Sendzimir (1894 -1989) the Sendzimir process uses a small amount of aluminium in a zinc bath to create a durable and highly resistant coating that has very little iron-zinc alloy. It is sometimes used to galvanise steel strip.

The Sendzimir process is used for the galvanising of steel strip. The strip is unwound from a coil. The oil or grease adhering to it is then removed by oxidation through heating. In the next stage, the strip is annealed and the oxides are reduced by ammonia. Then follows cooling (to approximately 500°C) and immersion of the strip in the zinc bath, which is kept molten at about 450°C by the temperature of the steel strip. On leaving the bath, the strip is cut or coiled.

= Related articles on Designing Buildings Wiki =

* Galvanised steel
* Rust.
* Super-strength steel structures.
* Wall tie failure.
* Zinc in construction.