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Very often the life of a corrosion protection paint coating system will not meet the design life of the steel structure it is supposed to protect. Decisions about coating selection are usually focusing on the costs for the initial construction, ignoring the certain future maintenance costs. The total cost of ownership includes the initial cost plus the maintenance, operating and finance costs over the life of a structure. Repeated maintenance operations, and resulting downtime, can add significantly to the total cost of ownership.
Controlling corrosion of steel is expensive. The direct costs of corrosion maintenance are estimated to be over 3% of GDP every year.1 Metallic zinc coatings provide very effective corrosion protection for steel by acting first as a barrier coating, keeping corrosive elements away from the steel, and secondly as a sacrificial anode.2 Should the zinc coating be compromised, accidentally by a scratch or on purpose with a drilled hole, the zinc will provide anodic protection to the exposed steel. Metallic zinc coatings can be pure zinc or zinc-based alloys and will be referred to generically as zinc coatings in the paper. Zinc coatings can be efficiently applied by thermal spraying, which involves projecting particles of semi-molten zinc onto the surface of the steel using compressed air. With thermal sprayed zinc (TSZ) coatings, there is no size limitation to the part to be coated, and the technology is fully portable, allowing easy field applications.