Alamarin Jet AJ 160, Operation And Maintenance Manual

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23 Operation and Maintenance Manual
Version 1.5 Version 1.5
The aluminum castings have also been protected by painting. Painting efficiently
prevents the propagation of various forms of corrosion e.g. pit corrosion.
Bare aluminum is liable to corrosion in difficult conditions. This is why it is important
to carry out touch-up painting if paint comes loose and aluminum is exposed. Touch-
up painting can be done in various ways. What is important is that the paints used are
suitable for aluminum and that the paint manufacturer’s instructions are followed during
painting.
1. Inspection hatch cover
2. Reversing deflector
3. Steering nozzle
4. Stator
5. Body (2 pcs)
1
2
3
4
5
3.5.2. Painting
Figure 3.5-1
If the boat is going to be used in waterways where the growth and sticking of organisms
around the boat’s bottom and the propulsion unit is heavy, the propulsion unit can be
painted with antifouling paint after installation. Generally speaking, antifouling paints
are based on various soluble substances, for example copper. Because the propulsion
unit is made mainly of aluminium, copper forms a highly unfavourable galvanic couple
with the propulsion unit. The aluminium starts to corrode because it functions as an
anode.
IF COPPER BEARING ANTIFOULING PAINT IS USED FOR PAINTING
THE PROPULSION UNIT, THE RESULT WILL BE HEAVY CORRO-
SION AND DESTRUCTION OF THE PROPULSION UNIT. DO NOT USE
ANY OTHER ANTIFOULING PAINTS FOR PAINTING THE PROPULSI-
ON UNIT EXCEPT THOSE INTENDED FOR ALUMINIUM SURFACES!