When it comes to shipbuilding and repair, one could argue that corrosion starts at the same moment as the design and construction of the vessel, as materials are prepared to do the job.
There’s a permanent corrosive action, under meteorological conditions, on submerged parts of a ship or structure. Simply put, corrosion is the destruction of a material caused by an electrochemical reaction with its environment.
This interaction between different materials and the environment is influenced by the different electrical potentials of the metallic parts, temperatures, concentrations, etc and the result is corrosion - basically the deterioration on the metal’s surface due to electrical, chemical or mechanical events.
When two dissimilar metals such as zinc and steel, are immersed in a conductive liquid acting as an electrolyte - sea water, for example - an electrical potential difference between these two materials (electrodes) occurs.
Zinc-it anodes quality is certified by the ISO 9001:2015 process trough the expected parameters and by experienced staff.
The use of pure raw materials and alloy composition complies with the worldwide accepted standard - MIL-A-18001K and MIL-DTL-24779B or NORSOK M-503 – final quality checks, weight, packaging and delivery make a difference towards our clients.
Zinc-it anodes are highly valued with excellent quality records appreciated by Shipbuilders and Yards, corrosion consultants and equipment retailers all around Europe.
All shipments are safeguarded by the chemical analysis issued to each production batch.
Anodes are produced in different shapes and sizes, depending on the size of the areas to protect. Metallic parts of the vessel must be in contact with an anode for which bolts are used or connection cables or simply welded to the steel.
On the external part of the vessel, the anodes must always be placed on a parallel position on the longitudinal length of the ship, thus obtaining the maximum performance of CP and keeping the drag on the ship’s movement to a minimum.
"Zinc-it" anodes are free of any rough edges or square angles, precisely to avoid drag increase. The anodes are to be installed along the wet surface of the hull, above and below the balance keels, and in higher number around the stern due to the high density of current originated by the propeller’s movement.
» Change your anodes when they are 50% corroded or less.
» Make sure they make good electrical contact – REMOVE ANY PAINT and clean the mounting surface
» On bolted anodes be sure to use news fasteners every time – even stainless bolts will probably fail as result of corrosion.
» Keep the protected areas immersed in water so that the anodes can work
» Paint over the anodes. They will be isolated and simply will not work
» Mix anode types –aluminum anodes will tend to protect the zinc anodes in the same bonding circuit