[Xi’an, July 25, 2025] – Large aboveground and underground storage tanks located in coastal and offshore facilities are exposed to aggressive corrosion conditions. Chloride-rich seawater, oxygen gradients, microbiologically influenced corrosion (MIC), and stray current interference all pose electrochemical challenges that threaten the structural integrity of assets.

At KIG Tech, we provide factory-manufactured, end-to-end cathodic protection systems—including both SACP (Sacrificial Anode Cathodic Protection) and ICCP (Impressed Current Cathodic Protection) solutions. Our NACE-certified engineers offer complete design support, from anode selection and sealing materials to CP transformer rectifiers with RS-485 protocol and on-site assistance.

Corrosion Mechanisms & Chemical Risks

1. Chloride-Induced Pitting and Crevice Corrosion
Chloride ions penetrate the passive film on steel surfaces, causing localized pitting in crevices.

• Anodic reaction: Fe → Fe²⁺ + 2e⁻
• Cathodic reaction: O₂ + 2H₂O + 4e⁻ → 4OH⁻
  These localized reactions accelerate wall thinning.

2. Oxygen Concentration Cells
Oxygen differentials create differential aeration cells. Oxygen-rich zones act as cathodes, while oxygen-depleted zones become anodes, triggering localized corrosion in poorly ventilated areas.

3. Microbiologically Influenced Corrosion (MIC)
Sulfate-reducing bacteria (SRB) under biofilms produce H₂S and organic acids, which accelerate corrosion.
Formation of FeS and its acidic by-products degrade steel surfaces.

4. Stray Currents & AC Interference
Nearby energized infrastructure or grounding systems may introduce stray DC or AC currents, which accelerate anodic metal loss or cause cathodic disbondment of coatings.

5. Hydrogen Embrittlement & Coating Breakdown
Over-polarization leads to hydrogen evolution. Hydrogen atoms diffuse into steel, causing embrittlement or coating delamination—especially under electrolytic conditions.

Tailored Cathodic Protection Solutions: SACP & ICCP

1.Sacrificial Anode Cathodic Protection (SACP)
Uses aluminum or zinc alloy anodes in seawater to generate protective current without an external power supply.
Magnesium-based SACPs, with high driving voltage, are ideal for high-resistivity areas and easier to install.
Pros: No external power, minimal interference.
Cons: Requires periodic anode replacement.

2. Impressed Current Cathodic Protection (ICCP)
Employs MMO/Ti tubular, ribbon, or flexible probe anodes powered by a DC power source.
Allows precise current control, avoiding under- or over-protection.
Ideal for large storage tanks requiring reliable, long-term corrosion control, even under fluctuating environmental stresses.

3.One-Stop System Integration

As a trusted cathodic protection manufacturer, KIG Tech provides:

• Customized sacrificial anodes (magnesium, aluminum, zinc) and MMO ICCP anodes
• CP accessories: cables, reference electrodes, grounding kits, sealing connectors
• NACE-certified design, modeling, and engineering support
• Isolation systems for stray current protection
• Remote monitoring and reporting systems for real-time performance tracking
• Technical documentation compliant with international standards and regulations

4. Why This Matters for Tank Operators

• Asset Longevity: Proper CP design prevents pitting, MIC, and coating disbondment
• Cost-Effective: Reduces maintenance, replacements, and downtime
• Global Compliance: NACE/ASTM-compliant systems ensure worldwide acceptance

5. Contact Us
Protect your tanks with KIG Tech’s turnkey cathodic protection solutions—engineered by experts, factory-built, and globally deployed.