b'FOGHORNFOCUS: OPERATIONSsprayed zinc coatings need no curingcoating. A wide variety of paintareas of the coating, or full repainting time, have no size limitations, and cansystems have been used successfullycan be deferred for years. Either way, be applied in the shop or in the field.to produce duplex zinc coatings. Theseduplex coatings reduce maintenance The best of both worlds, in termsinclude chlorinated rubber, acrylictime and cost, and increase the utilisa-of corrosion protection with zincresins, vinyl resins, epoxy resins, poly- tion rate of the ship. Time not spent at coatings, is obtained by applyingurethane resins and siloxane resins.the dock is time spent at sea. a paint top-coat over top of a solidFor ships, where marine corrosionThe galvanic properties of zinc metallic zinc coating. The service life ofenvironments are incredibly harshcoatings provide unsurpassed hot-dip galvanized or thermal sprayedand corrosion maintenance is verycorrosion protection for steel ships, zinc coatings is greatly extended whenexpensive, duplex zinc coatings havewhile the various coating methods, protected with a paint top-coat. Thethe lowest total cost of ownership.from liquid zinc-rich paints, to solid paint adds an extra layer of barrier pro- In areas where the paint coating ismetallic coatings, to the combined tection to the metallic zinc, but moredamaged, the zinc coating continues toduplex coatings, provide enormous importantly, the galvanic nature ofprotect the steel, and red rust does notchoice and flexibility of application to zinc protects the paint from underfilmdevelop. Routine maintenance paintingguarantee maximum durability and corrosion at scratches and holes. Thecan be limited only to the damagedminimum maintenance. nsynergistic effect between the metallic zinc and the paint will provide a sig- About the Author nificant extension of the expected life ofMartin Gagn is a graduate of the University of Toronto [B.A.Sc] and the duplex zinc coating that can exceedMcMaster University [M.Eng] and has over 25 years of experience working primarily on zinc coatings, castings and energy applications. twice the sum of the expected lives ofHe is an award-winning public speaker, has over 50 published papers the zinc coating or the paint systemand one patent. He spoke at the PVA Annual Convention at MariTrends used by themselves. Painted metallic2020 in Tampa, FL. Martin is currently the Principal of ZELIXIR Inc, a zinc coated steel is called a duplextechnology and market development company.20JUNE 2020FOGHORN'