Section 7 Corrosion protection

7.1.1 Corrosion prevention and coatings requirements are to be in accordance with Ch 15 Corrosion Prevention of the Rules for Materials.

7.1.2 The design of the structure and methods of attachment of fittings are to take into consideration procedures to minimise corrosion of metal structures and fittings due to electro-chemical action. All exposed steel and aluminium alloy surfaces are to be protected by the application of a suitable paint and anti-fouling system and the fitting of a cathodic or impressed current cathodic protection (ICCP) system.

7.1.3 Sacrificial anodes are to be mounted equidistant between metals being protected, and their location and attachment are to be such as to minimise the effects of welding on the hull materials.

7.1.4 Anodes with cast-in galvanised steel straps are to be secured to the steel hull by welded studs or direct welding.

7.1.5 The design and performance characteristics of the cathodic protection system are the Builder's responsibility. Particular attention is to be given to the earth bonding system, to provide good electrical continuity.

7.1.6 Yachts fitted with a negatively grounded electrical system or fitted with a negatively grounded independent battery system may use the impressed current cathodic protection (ICCP) system.

7.2.1 Anti-fouling paints containing copper are not to be used.

7.2.2 Bilges and internal surfaces subject to salt laden air are to be coated with a waterproof mastic or equivalent.

7.2.3 Particular attention is to be given to the design and selection of materials used for underwater fittings and the associated piping systems to limit the effect of bimetallic corrosion. Where materials other than aluminium are used they are, in general, to be electrically insulated from the hull and internal metal piping or cathodically protected separately by anodes attached directly to such fittings.

7.3.1 Aluminium alloy or steel sterndrives, waterjet units and trimtabs are to be cathodically protected by anodes mounted on the hull, direct to the unit being protected or through the bonding system.

7.4.1 For ships that are required to comply with IMO Resolution MSC.215(82) - Performance Standard for Protective Coatings for Dedicated Seawater Ballast Tanks in all Types of Ships and Double-Side Skin Spaces of Bulk Carriers - (Adopted on 8 December 2006), all dedicated seawater ballast tanks are to have approved coating systems applied in accordance with LR’s ShipRight Procedure Anti-Corrosion System Notation.

7.4.2  ShipRight ACS(B) will be entered in Column 4 of the Register Book to indicate that the seawater ballast tanks are coated with approved coating systems in accordance with IMO Resolution MSC.215(82) - Performance Standard for Protective Coatings for Dedicated Seawater Ballast Tanks in all Types of Ships and Double-Side Skin Spaces of Bulk Carriers - (Adopted on 8 December 2006)