galvanic couple
A 'galvanic couple' involves two different metals or conductive materials in contact, creating an electrochemical reaction that can lead to corrosion.
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Definition
C1Electrochemistry
(technical, academic)A pair of different metals or conductive materials that, when in contact and exposed to an electrolyte, form an electrochemical cell causing one material to corrode.
Example
- The galvanic couple formed between the steel and aluminum parts caused the steel to corrode rapidly.
- Marine engineers must consider galvanic couples to prevent corrosion in ship hulls.
C1Materials Science
(technical, academic)Two dissimilar metals in electrical contact with an electrolyte, generating a voltage and leading to electrochemical reactions.
Example
- The galvanic couple between copper and zinc in the presence of seawater led to the rapid deterioration of the zinc component.