corrosion

corrosion — noun

1. the gradual damage or destruction of a material, especially metal, caused by che

1.nounB2
Definition

the gradual damage or destruction of a material, especially metal, caused by chemical reactions with substances such as water, air, or acids

Example

The coastal pipeline was replaced after corrosion from salt water had eaten through the metal.

collocation: corrosion from + substance (salt water)

Kofi sprays his garden tools with oil to protect them from corrosion each wet season.

collocation: protect from corrosion

Common collocations
  • corrosion from [substance]
  • corrosion of [material]
  • signs of corrosion
  • corrosion resistance
  • prevent / protect against / resist corrosion
Synonyms
  • rusting

    refers only to corrosion of iron or steel, not other metals

  • erosion

    broader term covering physical wearing away (by wind, water) as well as chemical

  • deterioration

    gradual decline from any cause, not only chemical

Antonyms
  • preservation

    keeping material in good condition through protective measures

Grammar Patterns

corrosion + of + noun

corrosion + from + noun

prevent/protect + corrosion

Usage Note

Typically uncountable. Subject is usually a metal or material; the agent (cause) follows from (corrosion from salt water). Frequently paired with verbs of prevention: prevent, protect against, resist, slow down.

Common Mistakes

The acid corrosion the metal quickly.
The acid corrodes the metal quickly.
Corrosion is a noun, not a verb; use corrode for the action.

2. the visible marks, rust, or discolouration that appear on a surface after chemic

2.nounB2
Definition

the visible marks, rust, or discolouration that appear on a surface after chemical damage has taken place

Example

Nadia brushed the green corrosion off the old copper pan with a soft cloth.

specific type: green corrosion on copper (patina)

A thick layer of brown corrosion covered the iron gate of the abandoned warehouse.

collocation: layer of corrosion

Common collocations
  • corrosion on [surface]
  • layer / patch / spot of corrosion
  • green / brown / black corrosion
  • remove / clean off corrosion
Synonyms
  • rust

    used only for the reddish-brown corrosion product on iron or steel

  • patina

    a green layer on copper or bronze, sometimes valued for its appearance

  • tarnish

    dulling of shiny metals like silver, gold, or brass

Antonyms
  • polish

    shiny, clean surface with no corrosion visible

  • shine

    the bright, reflective quality of an uncorroded metal surface

Grammar Patterns

corrosion + on + surface

layer / patch of corrosion

Usage Note

Often countable with a/an or plural when referring to specific spots, patches, or layers (several spots of corrosion). When uncountable, refers to the substance as a mass (corrosion had built up). The colour of the corrosion depends on the metal: green on copper/bronze, brown/orange on iron/steel.

Common Mistakes

I need to clean the corrosion off this gold ring.
I need to clean the tarnish off this gold ring.
The specific word depends on the metal; tarnish is the correct term for gold, silver, and brass.

Word family

  • corrode
    verbB2
  • corrosive
    adjectiveB2
  • corrosively
    adverbC1
  • corrodible
    adjectiveC1
  • anticorrosion
    adjectiveC1

Synonym discussion

Sense: noun/1

Corrosion is the most precise term for chemical damage to metals, but it is often confused with rusting, erosion, and deterioration. Rusting refers specifically to the corrosion of iron or steel — a reddish-brown oxide forms when these metals react with oxygen and moisture. Erosion is broader and includes physical wearing away by wind, water, or ice, not just chemical reactions. Deterioration is the widest term of the three: it covers any gradual decline in quality from any cause, including age, weather, or neglect. For example, a stone statue deteriorates from centuries of rain and wind (erosion, not corrosion), but a car door deteriorates from rust (a form of corrosion). A learner choosing between these words should ask whether the damage is chemical and metal-specific (corrosion), limited to iron/steel (rusting), or caused by physical forces (erosion).

rustingerosion ↗deterioration ↗

Common collocations

Nouns

Adverbs

Phrases

  • signs of corrosion
  • layer of corrosion
  • protection against corrosion
  • corrosion-resistant material
  • at risk of corrosion

Prepositions

Etymology

LatinFrenchEnglish

The word corrosion comes from Latin corrodere, meaning 'to gnaw away' — a combination of com- (an intensifier) and rodere (to gnaw, the same root as rodent). It passed through Old French corrosion before entering English in the 1500s, first used to describe chemical eating away of metals.