Materials Performance

AUG 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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51 MATERIALS PERFORMANCE: VOL. 57, NO. 8 AUGUST 2018 Continued on page 53 COATINGS & LININGS ESSENTIALS Corrosion-Inhibiting Primer Helps Restore Historic Croatian Monument The 640 shell holes in the Vukovar Water Tower will remain untouched as a symbol of the city's destruction and its resistance during the Croatian War of Independence in the early 1990s. Wikimedia Commons photo. e preservation of an historic war- destructed monument, the Vukovar Water Tower in Vukovar, Croatia, was recently ac- complished using a novel rust primer with migrating corrosion inhibitor technology. Manufactured by corrosion control tech- nologies group Cortec Corp. (St. Paul, Min- nesota, USA), the patented corrosion inhib- iting primer is designed to protect the reinforcing metal in concrete from corrosion. Corroded surfaces of the 50-m (165-ft) tall Vukovar tower were left unprotected and allowed to rust for 23 years after the end of the Croatian War of Independence in 1995. Finally, in early 2018, significant con- struction work began on the monument's refurbishment. After mechanically removing loose rust and scale with a wire brush, coating appli- cators washed the metal surfaces with water to remove excess salt contamination and dust. en the rust-converting primer—which can be applied to dry or damp surfaces—was applied directly to the metal surfaces at 3 to 5 mils (75 to 125 µm) of dry film thickness. Since overspray of the primer on the interior concrete surface dur- ing repair operations could affect the repair mortar's adhesion to the preexisting con- crete, the primer was applied by brush to the Vukovar Water Tower. e water-based, non-flammable primer combines chelating agents with a high- solids, waterborne latex that has extremely low water vapor permeability. e single- component liquid primer converts rust into a hydrophobic passive layer before coating it with a film-forming latex, which comprises n Fast response precision sensors provide accurate, repeatable readings n Auto Log mode—automatically records environmental parameters at user-selected intervals n Includes PosiSoft suite of software for viewing and reporting data n Advanced models upload readings to PosiSoft.net and send email alerts using WiFi 1 -8 0 0-448-3835 www. d efelsko. com NEW! Probe Models Award Winning Compatibility! The PosiTector gage accepts ALL coating thickness, surface profile, environmental, soluble salt, Shore hardness and ultrasonic wall thickness probes. D eFelsko Corporation l Ogdensburg, New York USA Tel: +1-315-393-4450 l Email: t echsale@defelsko.com NEW Select from 4 probe styles Integral probe n Integral n Cabled n Wind Speed n 1/2" NPT Threads Measures and records environmental conditions

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