P19.5
Corrosion Testing — Weight Loss Method
Procedure 26 of 40 · Chapter 19 · §19.2.3
2 tables 0 notes
Table 1
| Parameter | Mild steel | Copper | Aluminum |
|---|---|---|---|
| Alloy designation | SAE 1020 | C11000 | AA 6061 |
| Dimensions | mm | mm | mm |
| Exposed area | 28.0 cm² | 28.0 cm² | 28.0 cm² |
| Density (g/cm³) | 7.86 | 8.96 | 2.70 |
| Pre-cleaning solution | Clarke’s solution (SnCl₂ + Sb₂O₃ in conc. HCl) | 50 % HNO₃ | 70 % HNO₃ |
| Max corrosion rate (mm/year) | (5 mpy) | (3 mpy) | (2 mpy) |
| Max weight loss (mg/cm²/24h) |
Table 2
| Parameter | Test method | Acceptable range |
|---|---|---|
| Total acid content | P19.3 (titration) | % of declared value (HCl 9–15 %, sulfamic 5–15 %, phosphoric 5–15 %) |
| pH, neat product | Glass electrode, 25 °C | (HCl-based); 1.0–2.0 (sulfamic/phosphoric) |
| Viscosity (thixotropic types) | P19.4 (Brookfield) | 500 – 5,000 cP (RV #3 or #4, 10 RPM, 25 °C) |
| Corrosion rate, mild steel | P19.5 (weight loss) | mm/year |
| Corrosion rate, copper | P19.5 | mm/year |
| Corrosion rate, aluminum | P19.5 | mm/year |
| Inhibitor efficiency | P19.5 | % |