Aluminum Sacrificial Anodes
Publish Time: 2026-09-14 Origin: Site
Marine corrosion remains a major challenge for ships, offshore platforms, subsea structures and other marine assets exposed to seawater. Without effective protection, corrosion can gradually weaken steel structures, increase maintenance costs and shorten service life. Aluminum sacrificial anodes provide a proven and practical solution through cathodic protection.
How Do Aluminum Sacrificial Anodes Work?
An aluminum sacrificial anode is electrically connected to the steel structure that requires protection. When exposed to seawater, the aluminum alloy acts as the anode and is preferentially consumed, supplying protective current to the steel structure. In this way, the steel becomes the cathode and its corrosion rate can be significantly reduced.
Why Choose Aluminum Anodes?
Aluminum-based sacrificial anodes are widely used in marine and offshore environments because of their combination of electrochemical performance and low weight. Compared with conventional anode materials, aluminum alloys can provide high current capacity while reducing the overall weight of the cathodic protection system.
Key Advantages Include:
1.Excellent suitability for seawater environments.
2.High electrochemical capacity.
3.Lightweight design.
4.Reliable long-term cathodic protection.
5.Suitable for a wide range of marine and offshore structures.
Technical Parameter For Aluminum Anodes:
Specification | GB4948-2002 | GB4948-2002 | GB4948-2002 | GB4948-2002 | GB4948-2002 | Impalloy II | GalvanumⅢ | DNV |
Fe | ≤0.15 | ≤0.15 | ≤0.15 | ≤0.15 | ≤0.15 | ≤0.12 | ≤0.12 | ≤0,09 |
Si | ≤0.10 | ≤0.10 | 0.10～0.15 | ≤0.10 | ≤0.10 | ≤0.10 | 0.08-0.21 | ≤0.12 |
Cu | ≤0.01 | ≤0.01 | ≤0.01 | ≤0.01 | ≤0.01 | ≤0.006 | ≤0.006 | ≤0.003 |
Zn | 2.5-4.5 | 2.2-5.2 | 5.5-7.0 | 2.5-4.0 | 4.0～7.0 | 2.8-6.5 | 2.8-6.5 | 2.5-5.75 |
In | 0.018~0.050 | 0.020~0.045 | 0.025-0.035 | 0.020-0.050 | 0.020-0.050 | 0.01-0.02 | 0.01-0.02 | 0.015-0.040 |
Ti | 一 | 一 | 0.01-0.08 | ≤0.025 | ≤0.025 | 一 | ||
Ga | 0.005-0.020 | 0.005-0.020 | ||||||
Sn | 0.018~0.035 | 0.025-0.075 | ||||||
Mn | ||||||||
Mg | 0.50-1.00 | 0.50-1.50 | ||||||
Ni | 一 | |||||||
Hg | 一 | |||||||
Cd | 0.005-0.020 | 一 | 一 | 一 | ≤0.002 | |||
Others(each) | ≤0.02 | ≤0.02 | ||||||
Others(Total) | 一 | 一 | ||||||
Aluminium | Rest | Rest | Rest | Rest | Rest | Rest | Rest | Rest |
Elechtrochemical | ||||||||
Open Circuit Potential | -1.18~-1.10 | -1.18~-1.10 | -1.18~-1.10 | -1.18~-1.10 | -1.18~-1.10 | |||
Working Potential | -1.12~-1.05 | -1.12~-1.05 | -1.12~-1.05 | -1.12~-1.05 | -1.12--1.05 | ≤-1.050 | ≤-1.050 | ≤-1.050 |
Efficiency(%) | ≥85 | ≥85 | ≥85 | ≥85 | ≥90 | ≥85 | ≥85 | |
Capacity(Ah/kg) | ≥2400 | ≥2400 | ≥2400 | ≥2400 | ≥2600 | ≥2500 | ≥2500 | ≥2500 |
Aluminum Sacrificial Anodes-FAQ
Q1: Can you manufacture according to our drawing?
A: Yes, we can manufacture it according to your drawing.
Q2; Can you provide Mill Certificate / MTC?
A: Yes, we can provide a Mill Certificate / MTC
Q3:How long can an aluminum anode last?
A:The service life depends on factors such as anode size, seawater conditions, coating condition, and the required protection period.
Q4: Why choose aluminum anodes for marine applications?
A: Aluminum anodes offer high electrochemical performance, relatively light weight, and are well suited for seawater environments.