Corrosion Explanation:
Electrolysis Corrosion by electrolytic action has two causes:
Galvanic corrosion is caused by the natural voltage between two different metals in a conductor such as fresh or salt water. This never exceeds 1.2 volts. The sacrificial anode, made of zinc for salt water use, is sacrificed to protect the metal it is connected to. The anode will be depleted by electrolytic action, electrolysis, while the metal it is connected to, the cathode, is protected. Termed catholic protection. Galvanic voltage difference is a maximum of 1.2 volts so is at a very very low level compared to the electrolysis corrosion we are only too familiar with. A 1 kilogram block of zinc produces 1 millionth of an amp of good current. So is easily swamped by electrolysis corrosion.
Electrolysis corrosion is 1,000 to 10,000 greater ferocity than galvanic corrosion. It is generated by the vessels wet metal being at battery voltage of 12 or 24 volts, the seabed being at 1 volt and other vessel/s a third voltage. It flows between the vessel, seabed, other vessels and moorings. Electrolysis corrosion can only be measured then eliminated by the SeaBis System. See an explanation at www.seabis.com.au/seabis.html We guarantee the SeaBis System - money back - for two years.
Causes of electrolysis:
1. Batteries create electrolysis current 24 hours every day, permanently. They are by far the greatest source of electrolysis. Current path is through the water to the seabed and other vessels. SeaBis and Process of Elimination instructions, will provide an essential tool for removal of this electrolysis.
2. Shore mains AC connection creating a DC path between boats, is only present while actually plugged into shore mains and the SeaBis System not used. When SeaBis System is applied the hull, engine and all wet metal are open circuit (in home terms the electrical plug is pulled out of the wall socket). Now no electrolysis can occur. The vessel cannot generate or be affected by electrolysis.
To test anodes, at least expense, see: Anode Voltage Test Easy Kit here.
SeaBis will indicate electrolysis, and determine its severity. When Process of Elimination instructions, supplied with the SeaBis System are completed, all wet metal areas will be disconnected (electrically open circuit) from the water. Your vessel is immune to electrolysis. It cannot create or be influenced by electrolysis corrosion. Electrolysis corrosion is conquered.
Most electronics/electrics only fully power up when in full use, and full use is often when the electrolysis occurs. It is therefore advisable to install and leave SeaBis turned on permanently. When SeaBis detects electrolysis it will alarm and indicate the severity and direction of the electrolysis. Fault finding is by disconnection of equipment until SeaBis indicates Normal. See Process of Elimination instructions, here.
Continuous flashing of “AC only alarm” indicates AC voltage component exceeding 2 volts. (The AC isolating transformer may not be effective or you may be using a electrically noisy inverter or there may be poor earth connection). Ask an Electrician to check no hull DC path to shore AC mains power either via mains active, neutral or earth. SeaBis will detect and indicate this DC path. Follow Process of Elimination instructions, supplied with SeaBis. As a last resort only, use an isolating transformer to stop this path. Click Isolating Transformer on the following linked page before you consider an isolating transformer - here. There is a lethal risk. Call us if in doubt.
See Tips for TroubleShooters at here
Regards
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