Aluminium Boats:

Aluminium construction is a popular choice for trailer boats but is also used extensively for commercial craft and large super yachts.

Aluminium welded hulls have greater strength/weight ratio to most other construction materials. Impact resistance of marine grade aluminium alloy is about 30% greater than GRP and 45% greater than mild steel.

Aluminium needs special preparation for painting and special coating specification. However painting is for decoration only and the material can be left uncoated as often seen on fishing boats.

The weld quality is important in this type of construction and poor welds usually break early in the boats life.

Galvanic corrosion can be an issue as can electolytic damage. The boats electrical system must be kept in good condition to prevent earth leaks that can quickly cause damage. Most corrosion damage on aluminium boats is visible, but can be hidden in areas that are not easy to access. Early intervention is required so problems can be addressed before any significant damage occurs.

Anodes must be correctly arranged and dissimilar metal components insulated. Any steel or fittings containing copper can damage aluminium especially where the metal is wet with salt water.