This is the most common method specified in the standard. It involves thoroughly washing the affected equipment with a dilute alkaline solution, typically sodium carbonate. The alkaline solution neutralizes any polythionic acid that may have formed, rendering it harmless. The standard provides critical details on:
“The 2021 revision isn’t just a minor tweak,” notes the metallurgical consultant. “It contains critical adjustments regarding the sensitization of steel. Using a 1997 or 2004 version could result in using a wash solution that is ineffective or even damaging to modern alloys.” nace sp0170 pdf 2021
| Test | Frequency | Acceptance | |------|-----------|-------------| | Pull-off bond | 1 per 100 m² | ≥ 1.5 MPa | | Thickness (magnetic) | 5 per 10 m² | 80–120% of spec | | Porosity (ferroxyl) | 1 per 50 m² | ≤ 3 blue spots per 100 cm² | | Continuity | 100% of anode segments | ≤ 2 ohms | This is the most common method specified in the standard