Corrosion Potential Inspections
Our marine surveyors perform corrosion potential surveys on boats, yachts and docks. With a corrosion inspection, we assess, diagnose and troubleshoot corrosion and stray current problems on a boat, yacht or dock.
With corrosion potential inspection, we are able to assess the following:
Measuring a boat’s hull corrosion potential
The hull potential for a vessel is a function of its hull material and its underwater metals. Whether it is an aluminum, steel, fiberglass or a wooden vessel, the hull potential shows if the vessel’s underwater metals are protected against corrosion or not.
Verifying the boat’s bonding system
Sacrificial anodes such as zincs mounted on the exterior of the vessel’s hull provides corrosion protection to underwater metals including but not limited to propeller shafts, struts, rudder posts, thru-hull fittings, seacocks etc. via the bonding system. We are able to verify each component’s good connection to the vessel’s bonding system.
Checking the boat’s galvanic isolation
When a boat’s AC shore cable is connected to a dock’s power pedestal, it is possible for the vessel to galvanically couple to other boats and underwater metals in the vicinity. We are able to determine the galvanic currents to and from the boat and comment on the possible measures.
Locating stray currents on the boat
The most insidious form of marine corrosion is electrical leakage that causes electrolytic corrosion, also known as stray current corrosion. It is able to quickly consume a vessel’s sacrificial anodes and valuable underwater metals. We are able to detect its existence and pinpoint its cause. It is good practice to have the stray current property of a boat inspected regularly – before the hull starts “to boil”.