EQUIPMENT
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the carbon steel’s surface is turned into an alloy of stable oxides. Once the steel’s surface is stable (the way noble metals like gold and silver are stable) it will no longer react with the environment and corrode.
PROOF OF THE PUDDING CBPC coatings are now being manufactured by EonCoat, based in Raleigh, North Carolina. The capabilities of the coatings were recently proved in an application at a tank cleaning facility in Dallas/Fort Worth, Texas, DFW Tank Cleaning. This full-service facility specialises in chemical cleaning so is aware of the importance of corrosion resistance. This is particularly the case with DFW’s
flush tanks, which are used to hold the wastewater from the first flushes of tanks that the company cleans, which can include residual chemicals, until the wastewater is treated. Given its location, DFW is also doing a lot of business with carriers active in the shale oil sector. Joe Svehlak, facility manager at DFW
Tank Cleaning, explains: “Our corrosion protection for our 10,000-gallon flush tanks has to be particularly rugged because we mix the wastewater so it does not stratify, and sand, rocks, and even metal shavings can be present from the waste trailers we service. The corrosion protection also has to withstand the high-temperature, high- pressure water we often work with.” To improve corrosion control in the tanks,
DFW contracted DC Metal Construction of Ennis, Texas to coat the tanks with EonCoat®
.
Svehlak is pleased with the results: “EonCoat has stood up really well to everything from chemicals and salty brine to abrasion, high-pressure water and heat. I believe it will double the life of our tanks while significantly lowering maintenance costs and downtime.” Svehlak also believes that EonCoat has
potential in other applications in the supply chain. “Tanker truck and rail operations can benefit from the anti-corrosion coating’s reliability,” he says. “Its abrasion resistance would be a big plus to wastewater haulers or super sucker truck operators with vacuum tanks that may encounter metal chips, glass shards, etc. when cleaning out sumps. It would also resist tank corrosion when
transporting petroleum products or even used restaurant waste such as oil, fat, or grease.”
HOW IT WORKS EonCoat consists of two, non-hazardous components that do not interact until applied by a plural spray system like those commonly used to apply polyurethane foam or polyurea coatings. But the key to the coating’s success is
closer to the steel. Seen under a scanning electron microscope, EonCoat leaves no gap between the steel and the coating because the bond is chemical rather than mechanical. Since there is no gap, even if moisture were to get through to the steel due to a gouge, there is nowhere for the moisture to travel. Bobby Hobbs, a foreman with DC Metal
Construction, says: “Unlike traditional methods, the corrosion resistant coatings for mild steel have a double layer of protection.
The tough, outside ceramic coating will not chip like paint and takes sandblasting to remove. The chemically bonded layer stops corrosion and will not allow corrosion promoters to spread.” Since the coating is inorganic, there are
no volatile organic compounds (VOCs), no hazardous air pollutants (HAPs) and no odour. This means that the coating can be applied safely, even in confined spaces, and can be applied near continuing operations at the site, avoiding the need for excess downtime. There is also almost no curing time needed, meaning tanks can be put quickly back into service. As Hobbs explains, “After appropriate tank preparation, we found that if we spray EonCoat in the morning the tank can be returned to service the same day because it applies in one coat and dries quickly.” HCB
www.eoncoat.com
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