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Summary of the surface pH changes on brass coupons and a galvanic solder coupon.
| Metal Coupons | Flow condition | Stagnation | ||
|---|---|---|---|---|
| Ave. pH | ΔpH | Ave. pH | ΔpH | |
| Aged brass (80 days) | 9.0 ± 0.03 max.: 9.1 min.: 9.0 |
0.1 | 9.4 ± 0.08 max.: 9.5 min.: 9.0 |
0.5 |
| Aged brass (200 days) | 9.0 ± 0.08 max.: 9.1 min.: 8.8 |
0.3 | 9.2 ± 0.08 max.: 9.4 min.: 9.1 |
0.3 |
| Brass-lead galvanic connection (14 days) | 9.1 ± 0.12 max.: 9.4 min.: 8.9 |
0.4 | 8.9 ± 0.51 max.: 10.0 min.: 7.9 |
2.1 |
Initial bulk pH was 9.0.
