Ship Hulls
Cast aluminum hull anodes for vessel protection, repair docking and newbuilding projects.
DNV-RP-B401
ISO 15589-2
AMPP / NACE SP0176
Custom Manufacturing
Aluminum Sacrificial Anodes for Marine, Offshore & Subsea Cathodic Protection
Custom cast aluminum anodes manufactured for hulls, tanks, offshore structures, jetties and subsea pipelines, with traceable production and project-ready inspection documents.
Applications
Designed for marine, offshore and pipeline CP environments.
We support project buyers, EPC contractors, shipyards, offshore fabricators and cathodic protection contractors with application-specific aluminum anode production.
Ballast Tanks & Water Tanks
Anodes for tank internal protection where seawater or conductive water exposure is expected.
Offshore Platforms
Stand-off and structural anode solutions for offshore steel structures and marine exposure zones.
Subsea Pipelines
Aluminum bracelet and custom mounted anodes for subsea pipeline cathodic protection systems.
Jetties & Marine Structures
Protection for piles, wharfs, jetties, seawalls and other coastal steel infrastructure.
Custom CP Projects
Project-specific anodes made for drawings, installation methods and inspection document requirements.
Product Types
Custom cast aluminum anodes for different mounting conditions.
Available with cast-in steel cores, straps, brackets, inserts or customized mounting designs according to drawings.
Aluminum Hull Anodes
For vessel hull protection and marine maintenance supply.
Aluminum Tank Anodes
For ballast tanks, water tanks and tank internal cathodic protection.
Offshore Stand-off Anodes
For offshore structures requiring stand-off mounting and project documentation.
Aluminum Bracelet Anodes
For subsea pipelines and cylindrical structures requiring custom fit-up.
Weld-on Aluminum Anodes
For steel structures where welded installation is specified by the project.
Bolt-on Aluminum Anodes
For applications requiring removable or bolted mounting arrangements.
Custom Aluminum Anodes
Made according to buyer drawings, net weight, core design and packing requirements.
International Standards
Manufactured for international cathodic protection projects.
We manufacture aluminum sacrificial anodes according to international cathodic protection project requirements. Chemical composition, electrochemical performance, dimensions, weight and steel core details can be inspected and documented before shipment.
DNV-RP-B401 Marine CP design reference
ISO 15589-2 Offshore pipeline CP
AMPP / NACE SP0176 Submerged steel systems
MIL-DTL-24779 Marine anode reference
GB/T 4948-2025 Aluminum alloy sacrificial anodes
Project-specific specifications Buyer drawings and ITP
Alloy & Test Data
Chemical Composition & Electrochemical Performance
High-performance Al-Zn-In aluminum anode alloys with guaranteed current capacity of 2700 Ah/kg or higher, controlled impurities, stable driving voltage and traceable test reports for marine, offshore and subsea cathodic protection projects.
≥2700
Ah/kg current capacity guaranteed for each shipped Al-Zn-In aluminum anode when tested according to the agreed method.
Every Anode
Performance acceptance can be controlled at finished-anode level, not only by furnace batch reference.
Body Sampling
Finished-anode body sampling is supported for customer inspection, third-party testing and project acceptance.
Main Recommended Alloy: Al-Zn-In
Al-Zn-In aluminum alloy is our recommended alloy system for marine, offshore and subsea cathodic protection applications. It is designed for stable activation, guaranteed high current capacity, high current efficiency, uniform consumption and reliable performance in seawater environments.
- Suitable for seawater cathodic protection
- Stable closed circuit potential
- Guaranteed current capacity of 2700 Ah/kg or higher
- Uniform anode consumption
- Low impurity control
- Finished-anode body sampling supported
- Third-party testing available upon request
Available Aluminum Anode Alloy Systems
Al-Zn-In Alloy
Main alloy system for marine, offshore and subsea cathodic protection applications. Recommended for most international CP projects.
Al-Zn-In-Sn Alloy
Tin-activated aluminum anode alloy system. Available according to project specifications, owner requirements or Chinese standard requirements.
Al-Zn-In-Si Alloy
Silicon-containing Al-Zn-In alloy system, available for specific project requirements where this alloy system is specified.
Modified Al-Zn-In Alloy
Customized alloy system with controlled additions such as Mg, Ti or Sn, depending on required electrochemical performance, owner specification and third-party approval.
Project-Specific Alloy
Chemical composition can be adjusted according to DNV-RP-B401, ISO project requirements, GB/T 4948-2025, owner specifications, drawings or approved technical datasheets.
Our standard recommendation for international marine and offshore projects is Al-Zn-In alloy. Other alloy systems are available upon request and shall be confirmed by the agreed project specification, drawing or approved datasheet.
Typical Chemical Composition
Typical Chemical Composition for Al-Zn-In Aluminum Anodes
| Element | Typical Range / Limit | Function / Control Purpose |
|---|---|---|
| Al | Balance | Base metal |
| Zn | 2.5 - 5.75% | Main activating alloying element |
| In | 0.015 - 0.040% | Activation and stable anode performance |
| Si | ≤ 0.12% | Controlled impurity |
| Fe | ≤ 0.09% | Strictly controlled impurity |
| Cu | ≤ 0.003% | Strictly controlled impurity |
| Cd | ≤ 0.002% | Restricted impurity |
| Others | According to project specification | Controlled based on customer requirements |
The above range is a typical reference for Al-Zn-In aluminum sacrificial anodes used in marine and offshore cathodic protection applications. Final chemical composition shall be confirmed according to the agreed standard, project specification, owner requirement or approved datasheet.
For every production batch, chemical composition can be tested and recorded with heat number traceability.
Electrochemical Performance
Typical Electrochemical Performance
| Property | Typical Value / Requirement | Remarks |
|---|---|---|
| Alloy Type | Al-Zn-In | Aluminum sacrificial anode alloy for seawater applications |
| Closed Circuit Potential | approx. -1.05 V to -1.10 V vs Ag/AgCl/seawater | Depending on test method, temperature and seawater conditions |
| Current Capacity | ≥ 2700 Ah/kg guaranteed | For each shipped Al-Zn-In aluminum anode when tested according to the agreed method and acceptance criteria |
| Current Efficiency | High efficiency performance | Verified by electrochemical testing |
| Consumption Behavior | Uniform consumption | Designed for stable cathodic protection current output |
| Test Method | DNV-RP-B401 / NACE TM0190 / project-specific procedure | Available according to project requirements |
| Body Sampling | Supported from finished anodes | Sampling plan can be agreed before production for customer or third-party inspection |
| Test Report | Available upon request | Chemical and electrochemical reports can be supplied before shipment |
For Al-Zn-In aluminum anodes, current capacity of 2700 Ah/kg or higher is guaranteed for each shipped anode when tested according to the agreed method. Finished-anode body sampling is supported, and final acceptance shall be based on the agreed project specification, sampling plan and official test report.
Stable Driving Voltage
Designed to provide stable cathodic protection current output in seawater environments.
Guaranteed High Current Capacity
Optimized Al-Zn-In alloy design supports 2700 Ah/kg or higher current capacity for each shipped anode under the agreed test method.
Controlled Impurities
Fe, Cu and Si are strictly controlled to reduce the risk of poor activation, unstable consumption or reduced current efficiency.
Uniform Consumption
Proper alloy control and casting quality help achieve uniform anode dissolution and reliable long-term protection.
Testing & Documentation
Testing & Documentation Available
Each batch can be supplied with traceable inspection documents to support project approval, client review and final acceptance before shipment.
Chemical Composition Report
Electrochemical Performance Test Report
Heat Number Traceability
Finished-anode Body Sampling Support
Material Test Certificate
Dimensional Inspection Report
Weight Inspection Report
Inspection and Test Plan
Third-party Test Report by DNV, BV, SGS, ABS or other agencies upon request
Project Acceptance
Aluminum anode performance shall be evaluated according to the agreed project specification, test method and acceptance criteria. For Al-Zn-In aluminum anodes requiring guaranteed current capacity, we can support finished-anode body sampling, electrochemical testing, third-party inspection and documentation before shipment.
Quality Control
Traceable production control from raw material to shipment.
Each order can be organized with inspection steps and records according to project requirements and agreed ITP.
Production Visibility
Manufacturing records and inspection documents prepared around the project requirement.
From furnace batch records to dimensional checks, the supply process can be documented for buyers, EPC teams, shipyards and third-party inspectors.
Raw Material Inspection
Incoming materials are checked before production release.
Furnace Batch Control
Production batch information is recorded for traceability.
Chemical Composition Testing
Alloy composition can be tested and documented.
Casting & Steel Core Position Control
Core position and casting quality are checked during production.
Dimensional and Weight Inspection
Dimensions and weight are inspected against drawings and PO requirements.
Electrochemical Performance Testing
Performance tests can be arranged according to project requirements.
Packing and Shipping Inspection
Export packing and shipping marks are checked before dispatch.
Traceable Documentation
Inspection records and certificates can be prepared for project approval.
Available Documents
Inspection documents for procurement and project handover.
Document scope can be matched to the purchase order, project specification and third-party inspection plan.
- Material Test Certificate (MTC)
- Chemical Composition Report
- Electrochemical Performance Test Report
- Dimensional Inspection Report
- Weight Inspection Report
- Inspection and Test Plan (ITP)
- Packing List
- Certificate of Origin
- Third-party inspection by DNV, BV, SGS, ABS or other agencies upon request
Why Choose Us
Practical manufacturing support for overseas CP projects.
CathPro supplies custom sacrificial anodes with flexible documentation support for marine, offshore and pipeline projects.
- Custom manufacturing according to drawings
- Experience in sacrificial anode production
- Traceable batch control
- Strict impurity control
- Export packing available
- Flexible support for project documentation
- Suitable for marine, offshore and pipeline CP projects