What does this research mean for the field?

A depolarization criterion below 100 mV protects steel in chloride-loaded concrete as effectively as the conventional 100 mV criterion while requiring a markedly lower protection current density. Novelty: ClaimNovelty.CONTRADICTORY. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

To evaluate whether cathodic protection depolarization criteria below the standard 100 mV threshold can effectively suppress steel corrosion across various chloride concentrations in concrete.

August 22, 2026Corrosion and Materials DegradationOpen Access

An Experimental Study on the Cathodic Protection Criteria of the 100 mV Depolarization for Chloride-Loaded Reinforced Concrete

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Authors

MCMuhammad Akbar CarongeHasanuddin University SOShunsuke OtaniEmory University DYDaisuke YamamotoNational Institute of Technology, Oita College

Discussion

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Implication

Experimental study demonstrates that depolarization levels below 100 mV reduce steel corrosion in chloride-loaded concrete, indicating lower cathodic protection currents are sufficient.

Key Points

To evaluate whether cathodic protection depolarization criteria below the standard 100 mV threshold can effectively suppress steel corrosion across various chloride concentrations in concrete.
Fabricated concrete specimens with a 0.55 water-to-cement ratio and admixed NaCl at chloride contents of 2, 5, and 10 kg/m3 (0.58%, 1.45%, and 2.90% by cement mass).
Pre-corroded steel bars using an impressed current of 1.33 A/m2, then applied cathodic protection for 250 days at 20 ± 2 °C and 60% relative humidity under target depolarization ranges of 21–37 mV, 57–63 mV, and 117–121 mV.
Cathodic protection reduced corrosion rates to 0.18–0.95 mA/m2 after 250 days, achieving a 60–77% reduction compared to unprotected controls.
Increasing the target depolarization from 25 mV to 100 mV yielded only a marginal 6–11 percentage point improvement in corrosion rate reduction.
The observed corrosion reduction factors of 2.5–4.3 were substantially lower than the theoretical factor of 50 predicted by the Tafel relationship for 100 mV activation polarization, indicating that sub-100 mV depolarization criteria provide adequate protection at lower current densities.

Cite This Study

Caronge et al. (2026) studied this question.

synapsesocial.com/papers/6a89600eca7ade938187f14f https://doi.org/10.3390/cmd7030052

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August 22, 2026Corrosion and Materials DegradationOpen Access

An Experimental Study on the Cathodic Protection Criteria of the 100 mV Depolarization for Chloride-Loaded Reinforced Concrete

View Full Paper

Ask AI

Bookmark

Authors

MCMuhammad Akbar CarongeHasanuddin University SOShunsuke OtaniEmory University DYDaisuke YamamotoNational Institute of Technology, Oita College

Discussion

Member takes

Implication

Experimental study demonstrates that depolarization levels below 100 mV reduce steel corrosion in chloride-loaded concrete, indicating lower cathodic protection currents are sufficient.

Key Points

To evaluate whether cathodic protection depolarization criteria below the standard 100 mV threshold can effectively suppress steel corrosion across various chloride concentrations in concrete.
Fabricated concrete specimens with a 0.55 water-to-cement ratio and admixed NaCl at chloride contents of 2, 5, and 10 kg/m3 (0.58%, 1.45%, and 2.90% by cement mass).
Pre-corroded steel bars using an impressed current of 1.33 A/m2, then applied cathodic protection for 250 days at 20 ± 2 °C and 60% relative humidity under target depolarization ranges of 21–37 mV, 57–63 mV, and 117–121 mV.
Cathodic protection reduced corrosion rates to 0.18–0.95 mA/m2 after 250 days, achieving a 60–77% reduction compared to unprotected controls.
Increasing the target depolarization from 25 mV to 100 mV yielded only a marginal 6–11 percentage point improvement in corrosion rate reduction.
The observed corrosion reduction factors of 2.5–4.3 were substantially lower than the theoretical factor of 50 predicted by the Tafel relationship for 100 mV activation polarization, indicating that sub-100 mV depolarization criteria provide adequate protection at lower current densities.

Cite This Study

Caronge et al. (2026) studied this question.

synapsesocial.com/papers/6a89600eca7ade938187f14f https://doi.org/10.3390/cmd7030052

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