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1. Strict Compliance with International Standards
Our Zinc Sacrificial Anodes are manufactured to meet the rigorous MIL-DTL-18001K (formerly MIL-A-18001K) and ASTM B418 international standards. We utilize Special High Grade (SHG) zinc with a purity level of at least 99.995%. This strict adherence to chemical composition prevents the formation of a passive oxide film that can halt the sacrificial process. By providing certified high-purity zinc sacrificial anodes, we ensure that our products deliver consistent, reliable performance in the most aggressive high-salinity marine environments without the risk of premature failure.
2. Exceptionally Stable Driving Potential
The core advantage of our zinc anodes lies in their exceptionally stable driving potential throughout their entire service life. Maintaining a consistent closed-circuit potential of approximately -1.05V (vs. Ag/AgCl), these anodes ensure that the protected steel structure remains effectively polarized. Unlike magnesium, which can over-protect and lead to hydrogen embrittlement, or lower-grade aluminum, which may fluctuate, our zinc anodes provide a "safe" and steady voltage. This makes them the ideal cathodic protection solution for propellers, rudders, and sensitive naval components where precise electrochemical control is paramount.
3. High Current Efficiency and Utilization
With a high current efficiency exceeding 95%, our zinc anodes offer a theoretical electrochemical capacity of approximately 780 Ah/kg. Because they do not suffer from significant self-corrosion, almost all of the material is effectively utilized for protecting the ship's hull and internal ballast tanks. This high utilization rate provides shipowners with a highly predictable maintenance schedule. Choosing our marine zinc anodes for hulls ensures a reliable, long-term return on investment by reducing the frequency of unplanned dry-docking and extending the intervals between structural inspections.
4. Time-Tested Reliability and Proven Track Record
Zinc is the most time-tested anti-corrosion material in the maritime industry. We have successfully supplied over 5,000 global projects, including commercial tankers, naval frigates, and port infrastructure. Our advanced casting techniques eliminate internal air pockets and porosities, ensuring that the anodes dissolve uniformly without mechanical detachment. The reliability of our zinc alloy is backed by comprehensive factory acceptance testing (FAT) and third-party certifications. This proven history of zero failures gives technical managers and shipyards the ultimate confidence when safeguarding high-value maritime assets.
1. For Hull
(1) Single iron foot welded ZH-(1~10)
(2) Double iron foot welded ZH-(11~12)
(3) Bolted AH-(13~14)
Model | Anode Size (mm) | Iron Foot Size | Net Weight(kg) | Gross Weight(kg) | Service Life(Years) | |||
|---|---|---|---|---|---|---|---|---|
A*B*C | D | E | F | G | 100% Ballast Condition | |||
ZH-1 | 800*140*60 | 900 | 45 | 5~6 | 8~10 | 45.4 | 47.0 | 8 |
ZH-2 | 800*140*50 | 900 | 45 | 5~6 | 6~8 | 37.4 | 39.0 | 6 |
ZH-3 | 800*140*40 | 900 | 45 | 5~6 | 5~6 | 29.5 | 31.0 | 5 |
ZH-4 | 600*120*50 | 700 | 40 | 5~6 | 6~8 | 24.0 | 25.0 | 5 |
ZH-5 | 400*120*50 | 470 | 35 | 4~5 | 6~8 | 15.3 | 16.0 | 5 |
ZH-6 | 500*100*40 | 580 | 40 | 4~5 | 5~6 | 12.7 | 13.6 | 3 |
ZH-7 | 400*100*40 | 460 | 30 | 4~5 | 5~6 | 10.6 | 11.0 | 3 |
ZH-8 | 300*100*40 | 360 | 30 | 3~4 | 5~6 | 7.2 | 7.5 | 3 |
ZH-9 | 250*100*40 | 310 | 30 | 3~4 | 5~6 | 6.2 | 6.5 | 3 |
ZH-10 | 180*70*40 | 230 | 25 | 3~4 | 5~6 | 3.3 | 3.5 | 2 |
ZH-11 | 300*150*50 | 360 | 30 | 4~5 | 5~6 | 13.7 | 14.5 | 5 |
ZH-12 | 300*150*40 | 360 | 30 | 4~5 | 5~6 | 10.7 | 11.5 | 4 |
ZH-13 | 300*150*50 | 250 | 50 | 3~4 | 8~10 | 11.6 | 12.0 | 5 |
ZH-14 | 300*150*40 | 250 | 50 | 3~4 | 8~10 | 8.6 | 9.0 | 4 |
2. For Ballast Tank
Model | Anode Size (mm) | Iron Foot Size | Net Weight (kg) | Gross Weight (kg) | Service Life(Years) | |||||
|---|---|---|---|---|---|---|---|---|---|---|
A*(B₁+B₂)*C | D | E | F | G | H | 50% Ballast Condition | 100% Ballast Condition | |||
ZT-1 | 500*(115+135)*130 | 800 | 50 | 6 | 40 | 60 | 53.5 | 56.0 | 12 | 6 |
ZT-2 | 1500*(65+75)*70 | 1800 | — | φ16 | 20 | 40 | 48.3 | 50.0 | 6 | 3 |
ZT-3 | 500*(110+130)*120 | 800 | 50 | 6 | 40 | 60 | 48.0 | 50.0 | 11 | 5 |
ZT-4 | 1000*(58.5+78.5)*68 | 1300 | — | φ16 | 20 | 40 | 31.8 | 33.0 | 5 | 2 |
ZT-5 | 800*(56+74)*65 | 1100 | — | φ16 | 20 | 40 | 24.0 | 25.0 | 5 | 2 |
ZT-6 | 1150*(48+54)*51 | 1450 | — | φ12 | 15 | 35 | 18.6 | 20.0 | 3 | 2 |
ZT-7 | 250*(80+100)*85 | 310 | 30 | 4 | 6~8 | 0 | 12.8 | 13.0 | 5 | 2 |
ZT-8 | 200*(70+90)*70 | 260 | 30 | 3 | 6~8 | 0 | 7.3 | 7.5 | 3 | 1 |
Notice:
(1)The steel core for ZT-7, ZT-8 is made of flat bar
(2)The steel core for ZT-2, ZT-4, ZT-5, ZT-6 is round bar
3. For Harbour & Offshore Engineering Projects
Model | Anode Size (mm) | Deformed Steel Stanchion Dimension | Flat Steel Stanchion Dimension | Net Weight (kg) | Gross Weight (kg) | Service Life(Years) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
A*(B₁+B₂)* C | D | F | G | D | F | G | H | 50% Ballast Condition | 100% Ballast Condition | |||
ZI-1 | 1000*(115+135)*130 | 1250 | φ18 | 45 | 1250 | 40 | 8 | 45 | 111.6 | 115.0 | 16 | 8 |
ZI-2 | 750*(115+135)*130 | 1000 | φ16 | 45 | 1000 | 40 | 8 | 45 | 83.0 | 85.0 | 15 | 7 |
ZI-3 | 500*(115+135)*130 | 750 | φ16 | 45 | 750 | 40 | 6 | 45 | 55.0 | 56.0 | 12 | 6 |
ZI-4 | 500*(105+135)*100 | 750 | φ16 | 35 | 750 | 40 | 6 | 35 | 38.6 | 40.0 | 10 | 5 |
4.For Harbour Structures
(1) Long Strip ZE-(1~7)
Model | Anode Size(mm) | Flat Iron Foot Size | Net Weight (kg) | Gross Weight (kg) | Service Life(Years) | ||||
|---|---|---|---|---|---|---|---|---|---|
A*(B₁+B₂)*C | D | E | F | G | 50% Ballast Condition | 100% Ballast Condition | |||
ZE-1 | 500*(115+135)*130 | 620 | 50 | 6 | 8~10 | 54.5 | 56.0 | 32 | 16 |
ZE-2 | 1000*(80+100)*80 | 1200 | 30 | 6 | 6~8 | 49.0 | 50.0 | 27 | 12 |
ZE-3 | 500*(105+135)*100 | 620 | 40 | 6 | 8~10 | 39.2 | 40.0 | 16 | 8 |
ZE-4 | 500*(80+100)*80 | 620 | 30 | 6 | 6~8 | 24.4 | 25.0 | 12 | 6 |
ZE-5 | 400*(110+120)*50 | 500 | 35 | 4 | 5~6 | 15.4 | 16.0 | 8 | 4 |
ZE-6 | 300*(140+160)*40 | 360 | 60 | 4 | 5~6 | 12.0 | 12.5 | 9 | 4 |
ZE-7 | 200*(90+110)*40 | 250 | 30 | 3 | 5~6 | 5.3 | 5.5 | 6 | 3 |
(2) Disc-shaped ZE-(8~13)
Model | Anode Size (mm) | Flat Iron Foot Size | Net Weight (kg) | Gross Weight (kg) | |||||
|---|---|---|---|---|---|---|---|---|---|
A*B | C | D | E | F | G | H | |||
ZE-8 | φ300*60 | 40 | 80 | 50 | 12 | 6~8 | 6 | 29.8 | 30.0 |
ZE-9 | φ360*40 | 50 | 100 | 70 | 14 | 5~6 | 6 | 28.3 | 28.5 |
ZE-10 | φ300*40 | 40 | 80 | 50 | 12 | 5~6 | 6 | 19.8 | 20.0 |
ZE-11 | φ200*50 | 35 | 75 | 45 | 10 | 5~6 | 4 | 10.3 | 10.5 |
ZE-12 | φ180*50 | 35 | 75 | 45 | 10 | 5~6 | 4 | 8.3 | 8.5 |
ZE-13 | φ120*100 | 30 | 75 | 45 | 10 | 8~10 | 4 | 7.3 | 7.5 |
5.For Oil Storage Tanks
Model | Anode Size (mm) | Iron Foot Size | Net Weight (kg) | Gross Weight (kg) | Service Life(Years) | |||
|---|---|---|---|---|---|---|---|---|
A*(B₁+B₂)*C | D | F | G | 50% Ballast Condition | 100% Ballast Condition | |||
ZC-1 | 750*(115+135)*130 | 900 | φ16 | 8~10 | 82.0 | 85.0 | 15 | 7 |
ZC-2 | 500*(115+135)*130 | 650 | φ16 | 8~10 | 55.0 | 56.0 | 12 | 6 |
ZC-3 | 500*(105+135)*100 | 650 | φ16 | 8~10 | 39.0 | 40.0 | 10 | 5 |
ZC-4 | 300*(105+135)*100 | 400 | φ12 | 8~10 | 24.6 | 25.0 | 7 | 3 |
For Submerged Pipelines
Model | Anode Size(mm) | Flat Iron Foot Size | Net Weight (kg) | Gross Weight (kg) | Service Life(Years) | ||||
|---|---|---|---|---|---|---|---|---|---|
A*(B₁+B₂)*C | D | E | F | G | 50% Ballast Condition | 100% Ballast Condition | |||
ZP-1 | 1000*(78+88)*85 | 700 | 100 | φ16 | 30 | 49.0 | 50.0 | 8 | 4 |
ZP-2 | 1000*(65+75)*65 | 700 | 100 | φ16 | 25 | 32.0 | 33.0 | 5 | 2 |
ZP-3 | 800*(60+80)*65 | 600 | 100 | φ12 | 25 | 24.5 | 25.0 | 5 | 2 |
ZP-4 | 800*(55+64)*60 | 500 | 100 | φ12 | 20 | 21.5 | 22.0 | 4 | 2 |
ZP-5 | 650*(58+64)*60 | 400 | 100 | φ12 | 20 | 17.6 | 18.0 | 4 | 2 |
ZP-6 | 550*(58+64)*60 | 400 | 100 | φ12 | 20 | 14.6 | 15.0 | 4 | 2 |
ZP-7 | 600*(52+56)*54 | 460 | 100 | φ12 | 15 | 12.0 | 12.5 | 3 | 1 |
ZP-8 | 600*(40+48)*45 | 360 | 100 | φ12 | 15 | 8.7 | 9.0 | 2 | 1 |
For Casting
Model | φ15 | φ20 | φ25 | φ30 | φ35 | φ40 | φ45 | φ50 | φ60 | φ65 | φ70 | φ80 | φ90 | φ100 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
A | 300 | 300 | 300 | 300 | 300 | 300 | 300 | 300 | 300 | 300 | 300 | 300 | 300 | 300 |
B | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 60 | 65 | 70 | 80 | 90 | 100 |
Weight | 0.37 | 0.67 | 1.05 | 1.5 | 2.1 | 2.7 | 3.4 | 4.2 | 6.1 | 7.1 | 8.2 | 10.8 | 13.6 | 16.9 |
1. For Hull
2. For Ballast Tank
3. For Harbour & Offshore Engineering Projects
4. For Sea Water Cooling System
5. For Oil Storage Tanks
6. For Submerged Pipelines
7. For Casting
Operating & Installation Guide for Zinc Sacrificial Anodes
To ensure maximum cathodic protection for your vessel, follow these essential steps:
1. Surface Preparation: Prepare the mounting area by grinding the steel structure to a bright metal finish.
2. Secure Attachment: Securely attach the zinc sacrificial anode via welding or bolting, ensuring robust metal-to-metal contact for low-resistance electrical current flow.
3. No Coating: Crucially, never apply paint or coatings to the anode surface, as this will insulate the alloy and halt the protection process.
4. Monitoring: Periodically monitor consumption; once the anode is 75-80% depleted, schedule a replacement to maintain continuous corrosion defense.
Q: Why is zinc often preferred over aluminum for protecting propellers and rudders?
A: Zinc provides a very stable and safe driving potential (approx. -1.05V). This makes it ideal for protecting high-precision components like propellers, rudders, and salt-water cooling systems. Its reliable performance ensures that these critical assets are not over-protected, which could otherwise lead to coating damage or unwanted electrochemical reactions.
Q: Can zinc anodes be used effectively in freshwater or brackish water?
A: Zinc anodes are highly efficient in seawater (high salinity). However, they are less effective in freshwater, where a passive film may form on the surface, reducing current output. For freshwater applications, we recommend magnesium anodes; for high-salinity marine environments, our zinc anodes remain the most time-tested and reliable corrosion solution.
Q: How can I tell when my zinc anodes need to be replaced?
A: You should schedule a replacement when the anode has consumed approximately 75% to 80% of its original weight. Regularly inspecting the anodes during scheduled maintenance or dry-docking is essential. If the surface appears heavily pitted and the remaining material is minimal, replacement is necessary to ensure continuous structural integrity.
