Materials Performance

NOV 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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Page 31 of 72

29 MATERIALS PERFORMANCE: VOL. 57, NO. 11 NOVEMBER 2018 Continued on page 31 COATINGS & LININGS ESSENTIALS Measure the adhesion of coatings to metal, wood, concrete and more DeFelsko Corporation • Ogdensburg, New York + 1 ( 315 ) 393-4450 • 1-800-448-3835 www AT-A Automatic model Also available AT-M Manual n Impact and scratch resistant color Touch Screen display with keypad n Wirelessly connect the PosiTest AT-A to your smart device using our free app n Record the results as pass/fail and the nature of fracture — cohesive, adhesive and glue failures Continued f rom page 27 garnet had to be collected and cleaned for reuse," Hawkes says. "We began using shov- els and brooms to collect the material but a short while into the project, we managed to acquire a surplus three-stage vacuum sys- tem that automatically separates the mate- rial and prepares it for reuse." Hawkes stated that the weather was also a challenge. "ere was often only a small window of opportunity when the tem- perature was the correct level above the dew point, allowing us to work within the manufacturer's specifications," he says. Bowhill upgraded its workshops to install ducted gas-fired heating, which allowed them to get the girder sections to an overall even surface temperature. "It was impor- tant to heat the girder sections so that the coating materials adhered to the substrate and cured effectively," Hawkes adds, "but the size made it difficult to evenly heat the girders." e duration of the project meant that some of the coating work took place during the Tasmanian winter, requiring McElli- gott's to adjust its work schedule. "To meet overall deadlines, abrasive profiling was conducted overnight and painting took place during the day in order to reduce the amount of extra heating required," Berry adds. e coating system was a zinc-rich epoxy, followed by an aluminium pig- mented epoxy, and the final coat was Hard- top AS † , manufactured by Jotun. e total surface area coated by each coating com- pany was approximately 6,500 m 2 of exterior surface and 9,000 m 2 of internal surfaces. Rob Butcher, state manager—Protective Coatings (SA and Victoria) at Jotun, said his company's challenge was to specify a mate- rial that could be used by two separate companies located in quite different cli- matic environments. "One company is 200 km inland in South Australia where it can get very hot and dry, whereas the other is on the northern coast of Tasmania where there can be days when the temperature is close to zero," he says. e specification of the coating material had to accommodate its application in both places. It was essential that the finished coat- ings from both applicators matched as much as practical. "We were able to use the Australian Standard 2312.1. 2 is standard has been tried and tested in our industry for many years and is well accepted," Butcher states. e Australian Corrosion Associa- tion has been a part of the research into the performance of coatings in Australia for many decades. It was involved in the report that led to removal of lead paints from Aus- tralia in the 1990s and continued this by contributing to international standards relating to coatings safety. "When applying the coating, the big sec- tions made it challenging to maintain a 'wet edge,' " Berry says. "We had to continually adjust the hardeners and thinners in order † Trade name.

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