Immersed steel, aluminium, stainless, bronze: electrolysis and corrosion are permanent threats for your boat
Galvatest  detects electrolysis before it is too late...


Performed continuously on all large ships, afloat control of 'corrosion potential' is probably the most misunderstood though the most essential maintenance operation performed to keep sailing capabilities and financial value of a small boat. It reveals at once unwanted electrolysis. It is a quick, reliable and easy practice, performed with the suitable equipment, which checks anodes efficiency and guarantees the integrity of the onboard electrical systems*. Indeed, electrical leakages significantly alter potentiel upwards (metals corrosion) or downwards (paints bubling). Galvatest develops techniques and systems about cathodic protection control and monitoring including leakage currents detection for small boats, thus preserving you from costly repairs...

 * Under and over-protection result in corrosion and blistering: When and how to proceed?

Galvatest Sensors

Galvatest sensors
Galvatest dipping sensors are Ag/AgCl reference electrodes allowing, when combined with a controller or a high impedance multimeter, accurate control of corrosion susceptibility for metal hulls and all propulsion systems. They are available in several versions, according to the intended use: boater or professional.

Galvatest Controller

Galvatest controller
Galvatest leds controller is a mobile electronic device, which,  combined with its Galvatest sensor, assesses at once, and as often as necessary, cathodic protection level of a metal hull or propulsion system and eventuality of stray currents, responsible for electrolysis, real foes of your boat.

Galvatest Kits

Galvatest kits
Galvatest kits are autonomous complete control systems intended for boaters and nautical professionals. Their regular methodic use is recommended to maintain the good "health" of any boat by checking the efficiency of anodes and ensuring the harmlessness of any servicing work on the boat's electrical circuit.

Galvatest round the world with Energy Observer

Galvatest - Energy Observer
Galvatest ensures anti-corrosion control of metallic immersed equipments of Energy Observer, the first hydrogen powered boat round the world. A useful task if we consider the important quantity of energy and many electrical circuits available on board...

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Steel or aluminium metal hulls

metal hull are corrosion sensitive

Metal hulls made of steel or aluminium are primarily concerned by electrolysis and the regular control of their corrosion potential. Such control is conducted in "real time" on all big ships and is an integral part of formal ABYC (American Yacht and Boat Council) recommendations for all recreational boats in aluminium. Be very careful with your hanging anodes : if they are made of magnesium at sea, they will be likely to destroy your immersed paint work. 

Wood or polyester (GRP) hulls

propulsion systems of grp hulls are very corrosion sensitive

Unlike metal hulls, wood or polyester hulls (GRP) do not carry electricity. Thus, propulsion systems, particularly S- or Z-drives, are very concerned by Galvatest control. Their carters are made of very conductive aluminium which stands as a primary route for on board or ashore stray currents seaking to travel through the sea...

They did not die all, but all were struck!

all were struck

40 mAh received during 30 days will definitely destroy 10 g of aluminium... And because it is a natural phenomenon, your boat did have, have or will have corrosion problems! Don't wait, act now! Consequences of corrosion – often costly – are never covered by insurance companies. Have a look at simulated consequences of a 1 Ah current leak received through an aluminium sail-drive during 100 days, page Demo & Cases.

Use of Galvatest is recommended by major

Regular control of metal hulls and immersed equipments corrosion potential is a recommended practice of international standards and major boat and equipment manufacturers. All our electrodes sensors are individually tested. Patented technology. Galvatest is a member of F2N: Filière Nautique Normande. en français

Galvatest en français...


The original comic strip "How goes your boat?"

To understand quickly and without painful headache, download our explanatory comic strip. You will learn, with just a few pictures, how to use Galvatest to assess instantly cathodic protection level given by anodes, and if harmful stray currents are eating your boat.

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The White Paper about cathodic protection...

WP Galvatest cathodic protection

With White Paper about cathodic protection published by Galvatest, you will learn all you ought (or wish) to know about galvanic and electrolytic corrosion phenomenons affecting small recreational or working boats.

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What certification bodies say...



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