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Which of the corrosion prevention method is used for reducing the maintenance cost of highway and bridges?

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Which of the corrosion prevention method is used for reducing the maintenance cost of highway and bridges?

(a) Sacrificial anode

(b) Impressed current supply

(c) Anodic protection

(d) Use of inhibitors

This question was posed to me during an internship interview.

This question is from Cathodic and Anodic Protection in portion Corrosion Prevention of Corrosion Engineering

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The correct choice is (b) Impressed current supply

The best I can explain: Impressed current supply is used as the corrosion prevention for reducing maintenance costs of big metallic structures such as highways and bridges. It also used to reduce the corrosion of reinforced steel.

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