Corrosion Of Metals
Akopọ
Every year, vast sums are spent replacing iron and steel that has crumbled into orange-brown rust. Rusting is a slow chemical attack that needs just two things from the environment, and once you know what they are, you know how to stop it. Protecting metal from corrosion is one of the most practical applications of chemistry.
In this lesson you will learn the conditions needed for iron to rust, the barrier methods that keep it dry and airtight, and the clever use of a more reactive metal in galvanising and sacrificial protection. You will explain sacrificial protection in terms of the reactivity series and the loss of electrons.
Awọn Afojusun
- State the conditions required for the rusting of iron and steel to form hydrated iron(III) oxide.
- State some common barrier methods, including painting, greasing and coating with plastic.
- Describe how barrier methods prevent rusting by excluding oxygen or water.
- [Supplement] Describe the use of zinc in galvanising as an example of a barrier method and sacrificial protection.
- [Supplement] Explain sacrificial protection in terms of the reactivity series and in terms of electron loss.
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Oriire fun ipari ẹkọ lori Corrosion Of Metals. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- Which two substances are needed for iron to rust? A. oxygen and carbon dioxide B. water and oxygen C. water and nitrogen D. salt and oxygen only Answer: B
- Rust is mainly: A. iron(II) oxide B. hydrated iron(III) oxide C. iron carbonate D. iron sulfide Answer: B
- Which is a barrier method of rust prevention? A. galvanising B. sacrificial protection C. painting D. attaching magnesium blocks Answer: C
- In sacrificial protection of iron, the metal used must be: A. less reactive than iron B. more reactive than iron C. a non-metal D. the same as iron Answer: B
- Galvanising protects steel by: A. only acting as a barrier B. only sacrificial protection C. acting as a barrier and by sacrificial protection D. making the steel more reactive Answer: C
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Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
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Abala ìwé ẹ̀kọ́
Corrosion
Define corrosion
"Chemistry: Corrosion" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/17-6-corrosion. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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