Which mechanism promotes corrosion in reinforced concrete when chloride ions reach the rebar surface?

💡 Explanation

When chloride ions penetrate the concrete and reach the rebar, they disrupt the passive oxide layer, creating an electrochemical potential difference between the passive and active (chloride-contaminated) areas, leading to corrosion. Therefore, corrosion begins from electrochemical potential difference, rather than passivation, galvanic protection, or compressive stress which would inhibit corrosion.

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