Nace Sp0170 Pdf 2021

NACE SP0170 PDF 2021: A Comprehensive Guide to Corrosion Prevention in Pipelines

NACE SP0170-2021: The Essential Guide to Protection of Steel in Concrete

1. What Is NACE SP0170?

Formerly known as NACE RP0170, SP0170-2021 is the industry standard for “Protection of Steel in Concrete from Corrosion Using Thermal-Sprayed Zinc Anodes”. It provides guidelines for designing, applying, and maintaining zinc-based thermal spray coatings (metallizing) as a galvanic cathodic protection (CP) system for reinforced concrete structures. nace sp0170 pdf 2021

In the high-stakes environment of the oil and gas industry, a single drop of water can be a ticking time bomb. When that water mixes with hydrogen sulfide ($H_2S$) and stresses a piece of steel, the result is not just corrosion—it is cracking, potential failure, and catastrophic safety hazards. NACE SP0170 PDF 2021: A Comprehensive Guide to

5. Step-by-Step Application Workflow

1. Surface prep – Abrasive blast to SSPC-SP 5/NACE No. 1 (white metal), 50–100 µm profile.
2. Zinc application – Twin-wire arc spray (most common) or flame spray; interpass temp <150°C.
3. Activation – Apply optional zinc chloride or phosphate conversion coating.
4. Testing – Bond, thickness, porosity, and continuity before and after topcoat.
5. Topcoating – Breathable organic coating (e.g., epoxy or acrylic) if required for abrasion or aesthetics.
6. Energizing – Direct connection to reinforcing steel (no rectifier needed for galvanic system).

4. Core Requirements Summary

| Parameter | Requirement (2021) | |-----------|--------------------| | Zinc coating purity | ≥ 99.5% Zn (per ASTM B833) | | Thickness (typical) | 250–500 µm (10–20 mils) | | Bond strength | ≥ 1.5 MPa (pull-off test) | | Porosity | ≤ 5% (image analysis or ferroxyl test) | | Electrical continuity | < 2 ohms between segments | | Current density | 5–20 mA/m² of anode surface | Surface prep – Abrasive blast to SSPC-SP 5/NACE No