Comparison of metals for offshore structure splash zone protection

This paper examines a variety of metal alloys useful as coverings for offshore structures to protect against the heavy corrosion present in the splash zone. The alloys are nickel-copper, cupro-nickel, stainless steel, titanium, aluminum, and steel. The general physical and corrosion characteristics for each alloy are presented. The method of attaching the covering to a structure and the extent of covering, partial or full, are discussed. Then, the alloys are compared in corrosion resistance, ease of construction and repairability, impact resistance, cost, and weight. The structure is assumed to be an offshore platform with a required full coverage area of 9290 square meters. A recommendation based upon the comparison is made as to the most suitable alloy and the method of application. It is concluded that cupro-nickel alloy 706 would provide cost effective corrosion resistance with full coverage of the submerged and splash zone area of an offshore platform