Corrosion & Cathodic Protection

Galvanic corrosion, anodes, impressed-current systems, bonding, coatings and underwater protection.

Engineer

Superyacht Corrosion Monitoring & Hull-Potential Surveys: Reference Electrodes, ICCP Logs, Anode Trends & Drydock Baselines

Corrosion monitoring turns isolated inspections into a through-life record of hull protection by comparing repeatable potential measurements, ICCP operating data, anode consumption, coating condition and local defect maps over time. Reliable trending depends on using the correct reference electrode and measurement locations, recording water and operating conditions, preserving controller logs and alarm history, repeating drydock photographs and measurements, and comparing results against the yacht's commissioned or approved corrosion-protection baseline rather than generic voltage limits.

Last verified: Aug. 10, 2026

Engineer

Superyacht Hull Coatings, Pitting & Crevice Corrosion: Underwater Inspection, Defect Mapping & Fault Diagnosis

Underwater hull coatings form the first barrier between structural metal and seawater, while local coating damage can expose small areas to intense corrosion. Reliable diagnosis depends on distinguishing coating breakdown, pitting and crevice attack from cathodic-protection faults, documenting defect location and extent, checking anode or ICCP coverage, examining edges, welds and penetrations, and comparing underwater or drydock findings against prior inspection records without inventing generic allowable wastage limits.

Last verified: Aug. 25, 2026

Engineer

Superyacht Impressed Current Cathodic Protection: Reference Electrodes, Hull Potential, Anodes & Fault Diagnosis

Impressed-current cathodic protection actively controls corrosion by applying regulated DC current to the submerged hull while reference electrodes feed hull-to-seawater potential back to the controller. Reliable protection depends on healthy reference cells, insulated ICCP anodes, sound cabling and power electronics, intact dielectric shields where fitted, correct vessel-specific set points, good coating condition and disciplined diagnosis of under-protection, over-protection and abnormal current demand.

Last verified: Aug. 10, 2026

Engineer

Superyacht Marine Corrosion & Sacrificial Anodes: Galvanic Cells, Bonding, Coatings & Fault Diagnosis

Marine corrosion is an electrochemical process accelerated by seawater, dissimilar metals, coating damage and unintended current paths. Reliable cathodic protection depends on understanding which underwater metals are electrically connected, selecting the approved sacrificial-anode alloy and capacity for the operating water, maintaining low-resistance bonding where required, preserving protective coatings, monitoring anode depletion and hull potential, and distinguishing normal anode consumption from galvanic or stray-current faults.

Last verified: Aug. 10, 2026

Engineer

Superyacht Propeller Shafts, Rudders & Bonding Continuity: Shaft Earthing, Slip Rings, Brushes & Fault Diagnosis

Propeller shafts, propellers, rudders and other immersed appendages can lose effective cathodic protection when bearings, seals, flexible couplings or poor bonding interrupt the intended electrical path to the hull. Reliable protection depends on verified shaft-earthing continuity, clean slip rings and brushes, correctly bridged insulated couplings, sound bonding of approved appendages, suitable anodes or ICCP coverage, and disciplined diagnosis of abnormal potentials, brush wear, pitting and localised corrosion.

Last verified: Aug. 10, 2026

Engineer

Superyacht Stray-Current Corrosion, Shore Power & Galvanic Isolation: Earth Paths, Isolators, Transformers & Fault Diagnosis

Shore-power connections and onboard electrical faults can create current paths through bonding systems, protective earth conductors, underwater metals and seawater, accelerating corrosion far beyond normal material wastage. Reliable diagnosis depends on distinguishing natural galvanic current from fault-driven stray-current leakage, preserving electrical safety earth paths, verifying galvanic isolators or isolation transformers, tracing DC leakage and bonding changes, and correlating electrical evidence with abnormal anode depletion or localised underwater-metal damage.

Last verified: Aug. 10, 2026