GB/T 39155-2020 in English
VALIDCorrosion of metals and alloys—Cathodic protection of harbour installations
- Issued on:2020-10-11
- Implemented on:2021-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$418.00
《GB/T 39155-2020金属和合金的腐蚀 海港设施的阴极保护》由TC183（全国钢标准化技术委员会）归口，TC183SC11（全国钢标准化技术委员会金属和合金的腐蚀分会）执行，主管部门为中国钢铁工业协会。
Introduction
Interpretation of the core content of the standard
This standard is equivalent to ISO13174:2012, which specifies the technical requirements for cathodic protection of steel port facilities in seawater environments. The key points include:
Protection scope: Applicable to submerged parts such as fixed/floating docks, mooring facilities, sheet piles, etc., not applicable to offshore platforms and ship protection.
Key technical parameters: The protection potential in aerobic environment needs to be ≤-0.80V (Ag/AgCl reference), the anaerobic environment needs to be ≤-0.90V, and the over-protection limit is -1.10V.
Comparison of Cathodic Protection System Designs
| System Type | Sacrificial Anode | Impressed Current |
|---|---|---|
| Applicable Scenarios | Conventional Port Facilities | High Current Demand or Brackish Water Environment |
| Current Density | 80-200mA/m² | 10-50% Margin Needs to be Added |
| Maintenance Requirements | Low | Regular Monitoring Required |
ALWC Special Treatments
For low water level accelerated corrosion (ALWC), the standard requires:
- When microbial corrosion is detected, the initial current density needs to be increased to 170-200mA/m²
- Polarization time may be extended, and margin needs to be reserved in the design
- It is recommended to use mixed metal oxide anodes to cope with high current requirements
Implementation recommendations
Coating joint protection: The coating damage coefficient is designed at 1%-2% (initial), and the annual degradation rate (0.5%-3%) needs to be considered.
Electrical continuity verification: All steel structures must ensure a connection resistance of ≤0.1Ω, and welding connection is recommended.
Commissioning points: Potential measurement must be completed within 3 months after installation, and monitoring points should be arranged at three elevations in the tidal range area.
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