Zinc anode are widely adopted for protecting steel construction from corrosion in seawater and saline mud. The chemical composition of the alloy anode is covered by US MIL-A-18001H and the ASTM-B418 type 1 standard.
Chemical composition
| Lead (max) | 0.006% |
| Iron (max) | 0.005% |
| Cadmium | 0.025-0.07% |
| Copper (max) | 0.005% |
| Aluminum | 0.1-0.55% |
| Zinc | Remainder |
| Potential | -1.10 Volts |
| Efficiency | 95% |
| Ampere hours / lb | 355 |
Specification of the zinc anode for buried pipeline
| Type | Spec.(mm) | Size of Iron Leg (mm) | WW(kg) | GW(kg) |
| Ax(B1+B2)xC | D | E | F | G |
| KTZN-P-9 | 600x(40+48)x45 | 360 | 100 | 12 | 15 | 9 | 8.7 |
| KTZN-P-12.5 | 600x(52+56)x54 | 460 | 100 | 12 | 15 | 12.5 | 12.0 |
| KTZN-P-15 | 550x(58+64)x60 | 400 | 100 | 12 | 20 | 15.0 | 14.6 |
| KTZN-P-18 | 650x(58+64)x60 | 400 | 100 | 12 | 20 | 18.0 | 17.6 |
| KTZN-P-22 | 800x(55+64)x60 | 500 | 100 | 12 | 20 | 22.0 | 21.5 |
| KTZN-P-25 | 800x(60+80)x65 | 600 | 100 | 12 | 25 | 25.0 | 24.5 |
MSN