Elevator Lift Corrosion: Protect The I-Beam Before It Becomes Structural.
An elevator lift’s I-beams live in saltwater, where corrosion can remove metal you cannot see from the dock. Learn the difference between galvanic and stray-current corrosion, how anodes and the disconnect protect the beam, and the ten signs that mean stop.
5.0- 35+ Years
- Licensed & Insured
- Lifetime Workmanship Guarantee
Recommended professional service
That mean stop and call
Whenever the lift is not in use
Every visit, for your warranty file
Written by Marc McGowan, owner of Boat Lift Installers. Two generations and 35+ years of combined experience installing, building and servicing boat lifts, docks and seawalls across South Florida. Updated September 2026.
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- Turn the properly installed lift disconnect off whenever the lift is not being operated.
- Sacrificial anodes are consumable. They must be the right alloy, in solid contact, and replaced before they are gone.
- Rapidly disappearing anodes, or anodes that never change, can both signal a problem.
- Deep pitting, cracks, bent beams or any tingling in the water mean stop, stay out of the water and call.
The I-Beam Carries The Load Underwater.
An elevator lift’s tracks or I-beams extend into the water and stay exposed to saltwater, oxygen, marine growth, dissimilar metals, tides and electrical conditions. Corrosion can remove metal from flanges, webs, edges, fastener areas, weld zones and the splash and tidal zone.
The beam carries concentrated lift and vessel loads. Deep pitting or section loss creates stress concentrations, and a severely corroded beam can bend, crack or fracture, allowing part of the lift or boat to drop. A beam can look fine from the dock while hidden areas have meaningful metal loss.
Corrosion Is A Structural Safety Issue
Do not operate a lift with cracking, splitting, severe pitting, flaking metal, deformation, loose mounting, unusual movement or rapid anode loss. If you feel tingling or suspect current in the water, stay out, keep others away and shut off power only from a safe, dry location.
'Electrolysis' Can Mean Two Different Problems.
Owners use the word electrolysis for two different kinds of accelerated underwater corrosion. The right protection and repair depend on which one is actually happening.
Galvanic Corrosion
Dissimilar metals in saltwater.
- Occurs when connected dissimilar metals are immersed in the same electrolyte, such as saltwater
- The less noble metal gives up material while the more noble metal is protected
- Sacrificial anodes are selected to corrode before the protected structure
- Turning AC power off does not stop the natural galvanic cell
Stray-Current Corrosion
Electricity where it should not be.
- Occurs when unintended current leaves a metal component and travels through the water
- Can come from damaged wiring, insulation faults, a miswired disconnect, wet enclosures or nearby equipment
- Material loss can be extremely rapid and highly localized
- Turning the disconnect off removes one possible source, but the actual source must still be found
Why Correct Disconnect Installation Matters.
The lift needs a correctly rated, properly installed, accessible disconnect. Incorrect installation or wiring can create or leave an unintended current path that severely weakens an underwater I-beam. Neptune Boat Lifts' warranty materials also require an electrical disconnect. The disconnect must never interrupt the required equipment-grounding path.
Zincs Are Protection That Gets Used Up.
Sacrificial anodes, often called zincs, are meant to corrode instead of the lift. Depending on the engineering, water chemistry and manufacturer, the specified material may be zinc, aluminum or another approved alloy. Neptune Boat Lifts’ warranty materials require anodes to be maintained.
Installed Correctly
Contact is everything.
- Needs clean, secure metal-to-metal continuity with the component it protects
- Paint, heavy oxidation, loose fasteners, sealant or the wrong mount can isolate it
- More anode is not automatically better; use the manufacturer’s specified arrangement
- Never substitute an unknown alloy or attach anodes randomly
Inspected & Replaced
Before they run out.
- Check for consumption, looseness, cracking, missing hardware, coating, growth and loss of contact
- Replace before they are exhausted, using the manufacturer’s condition limits
- Unusually fast consumption can signal an electrical or bonding problem
- Record the date, condition, remaining material and replacement details
Disconnect Off. Anodes Maintained. Service Twice A Year.
No single measure works alone. Proper electrical installation, an accessible disconnect, correct sacrificial anodes, timely replacement, structural inspection and documented service all protect the lift.
10 Signs An Elevator Lift Needs Inspection.
Stop operation and arrange a professional inspection if you notice any of these conditions.
Deep pits or sharp-edged metal loss
Localized attack can remove critical beam thickness even when nearby metal looks sound.
Cracks, splits or tearing
Any visible crack in an I-beam, weld, bracket or attachment needs immediate evaluation.
Bent, twisted or bowed beam
Distortion can mean overload, impact, loss of section, mounting movement or failure.
Heavy white corrosion or flaking
Deposits can hide pitting. They are not cosmetic staining.
Rapidly disappearing anodes
Abnormal consumption can point to galvanic demand or an electrical fault.
Anodes unchanged for a long time
They may be isolated by oxidation, coating, loose attachment, wrong alloy or poor continuity.
Burnt wiring, wet enclosures or repeated trips
Electrical faults create unsafe operation and can drive stray-current corrosion.
Shocks, tingling or unusual bubbling
Stay out of the water, keep others away, shut off power only from a safe, dry location and call.
Loose rollers, brackets or tie-backs
Movement and misalignment concentrate loads on already weakened areas.
New noise, binding or uneven travel
Mechanical symptoms can accompany beam, roller, cable or mounting damage.
Possible Current In The Water? Stay Out.
Do not enter or reach into the water. Keep people and pets away. Shut off power only from a safe, dry location and contact qualified electrical and lift professionals.
What Twice-Yearly Service Should Cover.
Boat Lift Installers LLC recommends professional service every six months. High salinity, heavy use, storms, flooding, rapid anode loss, nearby electrical changes or abnormal corrosion may require earlier attention. See how our boat lift service and repair program works.
Structure & Anodes
What is under the waterline.
- Inspect accessible flanges, webs, edges, welds, tracks, rollers, fasteners, brackets, tie-backs and mounts
- Remove only enough growth or deposits for inspection without damaging base metal or coating
- Check anode alloy, quantity, placement, attachment, consumption and continuity
- Photograph and measure suspicious pitting, section loss, cracking or distortion
Electrical & Operating
Where stray current starts.
- Inspect the disconnect, grounding, bonding, control box, conduit, wiring, GFCI protection and motors
- Investigate rapid or uneven anode loss, repeated trips, wet enclosures or suspected leakage current
- Confirm the disconnect shuts the lift down as intended
- Test the lift from a safe position and evaluate alignment, rollers, load balance and movement
Keep A Documented Service History
Keep service dates, contractor information, anode photos and replacement dates, beam-condition photos and measurements, electrical findings, repairs, invoices and recommendations. A documented history helps demonstrate required maintenance and can support factory and contractor installation warranties, subject to each warranty’s written terms.
Owner habits that help
- Turn the properly installed lift disconnect off whenever the lift is not being operated
- Never paint, coat, remove, relocate or substitute anodes without manufacturer guidance
- Request inspection after flooding, lightning, nearby electrical work, impacts, unusual anode loss or any change in operation
Due for your six-month service? We document every visit for your warranty file.
When A Beam Is Past Saving, We Replace It.
Boat Lift Installers LLC can inspect the complete elevator-lift setup, document I-beam and anode condition, identify visible corrosion, review the control and disconnect arrangement, coordinate qualified electrical evaluation and recommend the right repair.
When damage is too advanced for continued service, we perform a complete I-beam replacement and return the lift to a properly configured operating condition.
“Marc always does a great job making sure my lift is at peak performance!”
Damon C. · Boat lift service customer
- 35+ years on South Florida water
- Licensed & insured
- Lifetime Workmanship Guarantee
Elevator Lift Corrosion Questions
What causes electrolysis on a boat lift?
Owners usually mean one of two things. Galvanic corrosion happens when connected dissimilar metals sit in saltwater. Stray-current corrosion happens when unintended electrical current leaves a metal part and travels through the water, often from a wiring or equipment fault. Stray current can remove metal very quickly.
Should I turn off my boat lift when I am not using it?
Yes. Turning the properly installed disconnect off when the lift is not in use removes the lift’s energized source and can reduce exposure to faults that accelerate stray-current corrosion. It does not replace anodes or maintenance.
How often should boat lift zincs be replaced?
Replace anodes before they are exhausted, based on the manufacturer’s condition limits. We check them at every six-month service. If they disappear unusually fast, or do not change at all, something else needs investigating.
Can a corroded I-beam be repaired?
It depends on the damage. Only a qualified professional should decide whether a beam remains serviceable. When corrosion is too advanced, Boat Lift Installers LLC performs complete I-beam replacement.
What should I do if I feel a tingle in the water near my lift?
Get out and keep everyone, including pets, out of the water. Shut off power only from a safe, dry location and call qualified electrical and lift professionals right away.
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