To prevent this, the standard outlines four primary strategies:
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NACE SP0170-2021 – Zinc Thermal Spray for Concrete CP ✅ Min zinc purity: 99.5% ✅ Min bond: 1.5 MPa ✅ Thickness: 250–500 µm ✅ Max porosity: 5% ✅ Topcoat within 7 days if exposed to chlorides ✅ Activation required for high-alkali concrete (pH > 12.5) ✅ Do NOT use on unbonded prestressed strands nace sp0170 pdf 2021
NACE SP0170 (2021) strengthens industry guidance for External Corrosion Direct Assessment by emphasizing data quality, multi-method indirect inspection, probabilistic ranking, uncertainty quantification, and feedback from direct examinations. While ECDA is a powerful tool—especially for locations where direct inline tools are impractical—its effectiveness depends heavily on the quality of input data, appropriate selection and combination of indirect techniques, and disciplined verification. Operators should treat SP0170 as part of an integrated integrity-management strategy that includes CP optimization, targeted excavations, and, where feasible, complementary inspection technologies. To prevent this, the standard outlines four primary