Metal or thermal spraying is a technology, which protects or extends the life of a wide variety of
structures in the most hostile environments and in situations where coatings are vital for safety
and performance.  Thermal spraying is carried out in a wide range of anti‐corrosion or engineering
markets.  Typical applications include the spraying of ships, trawlers and other ocean going vessels.
The anti‐corrosive properties of the metal spraying process are widely recognised in the shipping
and marine industry, where steel super structures and vessels are subjected to very damaging
corrosion from the sea and salt laden air of the world’s shipping and fishing industries.
Metallisation’s Arcspray equipment is regularly used within the shipping industry to protect ships
and trawlers from corrosion and has been involved in a number of recent projects. One of those
saw Chorro Naval,  metal spraying a wide range of vessels using the Arcspray 140 system.  Chorro
Naval is a renowned shipyard based in Vigo, Spain, and has many years’ experience in maintaining,
repairing, restoring and building ships.  The company has vast expertise in maintaining all types of
ship including, fishing trawlers, merchant ships, cement carriers, supply ships, ferries and chemical
carriers.  The company offers a wide range of services to the shipyard industry including, hull shot
blasting in dry dock, tank coating and a wide range of ship restoration and painting services.

In five separate projects, Chorro Naval has metal sprayed a variety of shipping components with
pure zinc.   On a Spanish tuna fishing boat they metal sprayed the inside of the tunnel and the
fishing hold with a zinc aluminium alloy (85/15).   On two trawlers, built in a Vigo shipyard and
destined for the Faroe Islands, Chorro Naval metal sprayed all external areas of
the boats with zinc.  The external areas of a Danish patrol boat and an oceanographic Spanish ship
were also sprayed with pure zinc.  The final ship the ‘Ronja Polares’, a Norwegian fish carrier, was
also metal sprayed at the Vigo dry dock, which is fully kitted out to accommodate restoration and
metal spraying work.  The external areas metal sprayed during these projects included the hull, all
external decks, superstructures, the bridge, mast and chimney.
Spraying the stern of a crane with Zinc using a 20m supplies package
Prior to metal spraying, surfaces of the ship’s components, both internal and external, were shot
blasted to Standard SA 2.5 to clean and prepare the surface.   The zinc and zinc aluminium alloy
coatings were then applied using the Arcspray system.    The Metallisation Arcspray equipment is
the ultimate solution to today’s demands for high performance Arcspray coatings.
In Turkey, Metallisation customer, Celiktrans Shipyard, an expert shipyard that builds specialised
vessels for local and foreign ship owners, recently metal sprayed a 3,588 tonne Norwegian fishing
trawler.   Using the Arcspray 140 system, Celiktrans metal sprayed nearly 5000m2 of zinc to the
internal and external surfaces of the vessel.    The long supplies pack, unique to Metallisation,
enabled the operators to metal spray this large capacity vessel efficiently and safely, as the
energiser could remain securely located on the ground.  Celiktrans is a specialist ship builder and
provides, supply vessels, fishing vessels, ferries, tugboats and offers complex tailor made building
projects to its customers.
Cem Unver, Shipyard Manager at Celiktrans Shipyard, says: “We were very pleased with the two
ARC 140‐350 systems we bought specifically for this project.   We have never had any problems
with the equipment or the process.  In fact, we have been surprised by the user friendly operation
of the equipment and the technical assistance provided by Metallisation.    We are especially
impressed with the 20m supplies pack, which also influenced our decision to buy the ARC 140
systems.   The length of the supplies cables helped us a lot during the coating of interior spaces,
such as the cofferdams and tanks.  We have easily coated even the most difficult to reach areas
because of the long cables and the easy to operate light weight pistols.   We would like to say a
huge thank you to all at Metallisation and hope to see them as our solution partner for the future.”
In the Arcspray process, two electrically charged wires are driven and guided so that they converge
at a point and form an arc.  An air nozzle atomises the molten metal produced from the wire and
projects it towards the work piece using high pressure air.    This spray solidifies when it hits the
surface of the work piece to form a dense coating, which protects against corrosion.  The driving of
the wires is typically either by air motor or electric motor and gearbox arrangement.
Major advantages of the Arcspray process are that the coatings are available for almost immediate
use.    There is no drying or curing time, no risk of damaging the component and the deposits
possess a higher degree of bond strength than many other sprayed coatings.

 

For further information on these products or more details on the metal spray process please
contact Metal Spray Supplies Australia (07) 3823 1004/ Fax (07) 3823 1005/e‐mail
sales@metalspraysupplies.com

 

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