Galvanization: Difference between revisions
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==Galvanized piping== | ==Galvanized piping== | ||
{{See also|Galvanic corrosion|Pipe (fluid conveyance)|Piping}} | {{See also|Galvanic corrosion|Pipe (fluid conveyance)|Piping}} | ||
In the early 20th century, galvanized piping swiftly took the place of previously used [[ | In the early 20th century, galvanized piping swiftly took the place of previously used [[Strong iron pipe|cast iron]] and [[Pipe (fluid conveyance)#Materials|lead]] in [[Tap water|cold-water]] [[plumbing]]. Galvanized piping rusts from the inside out, building up layers of plaque on the inside of the piping, causing both water pressure problems and eventual pipe failure. These plaques can flake off, leading to visible impurities in water and a slight metallic taste. The life expectancy of galvanized piping is about 40–50 years,<ref>{{Cite web|last=Biard & Crockett|date=2016-05-16|title=How Long Will My Galvanized Pipes Last?|url=https://www.bcpsi.com/galvanized-pipes/|access-date=2021-02-06|website=Biard & Crockett}}</ref> but it may vary on how well the pipes were built and installed. Pipe longevity also depends on the thickness of zinc in the original galvanizing, which ranges on a scale from G01 to G360.<ref>{{Cite web|last=American Galvanizers Association|date=|title=Zinc Coatings|url=http://courtgalvanizinginc.com/wp-content/uploads/2012/04/Zinc_Coatings.pdf|archive-url=|archive-date=|access-date=|website=courtgalvanizinginc.com}}</ref> | ||
== See also == | == See also == | ||
Revision as of 05:15, 23 June 2025
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Galvanization (also spelled galvanisation)[1] is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which the parts are coated by submerging them in a bath of hot, molten zinc.[2]
Protective action
The zinc coating, when intact, prevents corrosive substances from reaching the underlying iron.[3] It's main function is to act as a sacrificial anode to prevent the iron from rusting by cathodic protection. Zinc is more reactive than iron, so the zinc coating preferentially oxidizes to zinc carbonate, preventing the iron from corroding, even if there are gaps in the zinc coating. Additional electroplating such as a chromate conversion coating may be applied to provide further surface passivation to the substrate material.[4]
History and etymology
The process is named after the Italian physician, physicist, biologist and philosopher Luigi Galvani (9 September 1737 – 4 December 1798). The earliest known example of galvanized iron was discovered on 17th-century Indian armour in the Royal Armouries Museum collection in the United Kingdom.[5]
The term "galvanized" can also be used metaphorically of any stimulus which results in activity by a person or group of people.[6]
In modern usage, the term "galvanizing" has largely come to be associated with zinc coatings, to the exclusion of other metals. Galvanic paint, a precursor to hot-dip galvanizing, was patented by Stanislas Sorel, of Paris, on June 10, 1837, as an adoption of a term from a highly fashionable field of contemporary science, despite having no evident relation to it.[7]
Methods
Hot-dip galvanizing deposits a thick, robust layer of zinc iron alloys on the surface of a steel item. In the case of automobile bodies, where additional decorative coatings of paint will be applied, a thinner form of galvanizing is applied by electrogalvanizing. The hot-dip process generally does not reduce strength to a measurable degree, with the exception of high-strength steels where hydrogen embrittlement can become a problem.[8]
Thermal diffusion galvanizing, or Sherardizing, provides a zinc diffusion coating on iron- or copper-based materials.[9][10]
Eventual corrosion
Galvanized steel can last for many decades if other supplementary measures are maintained, such as paint coatings and additional sacrificial anodes. Corrosion in non-salty environments is caused mainly by levels of sulfur dioxide in the air.[11]
Galvanized construction steel
This is the most common use for galvanized metal; hundreds of thousands of tons of steel products are galvanized annually worldwide. In developed countries, most larger cities have several galvanizing factories, and many items of steel manufacture are galvanized for protection. Typically these include street furniture, building frameworks, balconies, verandahs, staircases, ladders, walkways, and more. Hot dip galvanized steel is also used for making steel frames as a basic construction material for steel frame buildings.[12]
Galvanized piping
Script error: No such module "Labelled list hatnote". In the early 20th century, galvanized piping swiftly took the place of previously used cast iron and lead in cold-water plumbing. Galvanized piping rusts from the inside out, building up layers of plaque on the inside of the piping, causing both water pressure problems and eventual pipe failure. These plaques can flake off, leading to visible impurities in water and a slight metallic taste. The life expectancy of galvanized piping is about 40–50 years,[13] but it may vary on how well the pipes were built and installed. Pipe longevity also depends on the thickness of zinc in the original galvanizing, which ranges on a scale from G01 to G360.[14]
See also
- Electroplating
- Aluminized steel
- Cathodic protection
- Corrugated galvanized iron
- Galvanic corrosion
- Galvannealed – galvanization and annealing
- Prepainted metal
- Rust
- Rustproofing
- Sendzimir process
- Sherardizing
- Corrosion
- Sacrificial metal
- Corrosion engineering
References
External links
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- ↑ ZINC COATINGS OF INDIAN PLATE AND MAIL ARMOUR. Summary of XRF analysis conducted in September 1999 by the Royal Armouries Museum in Leeds and written up as part of a thesis by Helen Bowstead Stallybrass at the Department of Archaeological Sciences, Bradford University.
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