Balancing act: battling corrosion is a never-ending quest in which paint formulators need to supply their customers with solutions that balance performance with health, safety and environmental issues.
The bottom line in the battle against corrosion is that it costs everyone big money. The cost of corrosion to military equipment and infrastructure is estimated from $10-20 billion annually, according to the U.S. Department of Defense. While that sounds staggering, it's just a small piece of the puzzle. As part of a federal study, CC Technologies and Nace International reported the direct cost of corrosion in the U.S. to be $276 billion per year, or roughly 3.1% of national GDP--and that was five years ago.
Coatings manufacturers Coatings World spoke with are battling corrosion in a number of industries from wastewater to general/light industrial to automotive. Each customer is on a constant vigil in the battle against decay, and each market has its own specific issues. Add to that an ever-changing landscape in terms of health, safety and environmental issues, and it's easy to see just how complex the anti-corrosion market has become.
Kansas City, MO-based Tnemec, the privately held manufacturer of architectural and industrial coatings, has been active in the wastewater marketplace, working to combat sulfide corrosion.
"Biogenic sulfide corrosion of concrete has become an increasingly pervasive problem leading to the breakdown of concrete in wastewater collection and treatment structures," said Vaughn O'Dea, who was named Tnemec's technical sales manager, water and wastewater in early 2005. "Sulfide corrosion is a bacteriologically mediated process in which hydrogen sulfide gas is oxidized in the presence of moisture to form sulfuric acid that attacks the matrix of concrete. The effect of sulfuric acid on concrete surfaces exposed to the wastewater environment can be devastating."
The precursor for sulfuric acid is hydrogen sulfide ([H.sub.2]S) gas, and without [H.sub.2]S there would be no sulfuric acid. "Hydrogen sulfide has always existed in wastewater. However, recent trends of water conversation, industrial pretreatment, and covering structures to control odors all have attributed to the increased sulfide corrosion," O'Dea said. In addition, hydrogen sulfide gas can also attack metallic components of wastewater systems such as steel grit collectors, bar screens, conveyors, skimmers and other ferrous metal substrates.
Tnemec's weapon against this is Series 434 Perma-Shield [H.sub.2]S, a 100% solids, polyamine epoxy mortar designed to be trowel applied at 125 mils over concrete, and Series 435 Perma-Glaze, a 100% solids multifunctional polyamine epoxy designed to be applied to steel, concrete, or as a glaze coat over Series 434.
In addition, Tnemec has developed a severe wastewater analysis (SWAT) to simulate the effects of elevated hydrogen sulfide gas and sulfuric acid on coating systems used in severe wastewater environments. "Using the knowledge gained from our SWAT program, we can demonstrate the differences between coating formulations to customers," said O'Dea.
Showing the difference a specific coating technology can deliver in terms of savings and/or improved performance is critical for coatings manufacturers. To that end, companies are constantly tweaking their formulations to deliver better products.
Greenkote's latest development is a patented, proprietary corrosion resistant diffusion coating. The coating--which can also be applied as a pre-treatment before painting--supports the paint layer in the event of any damage, weakness or corrosion, offering a more effective corrosion protection solution, said Arie Laor, CEO of Greenkote. The coating provides an effective adhesion to paint while enabling a very low rate of corrosion under the paint layer, according to the company.
Greenkote's solution has been implemented by MAG, a supplier of integrative mechanical and electro-mechanical assemblies for auto makers such as Volkswagen, Opel, Ford, GM, Peugeot and Citroen.
For its work with Volkswagen, MAG was required to use a zinc nickel process with a cataphoretic dip painting treatment for the engine locks it provided the German automaker. Based on Volkswagen protocol, if MAG was to use that process, then they would have to ship all parts from their facilities in Israel to Germany to Volkswagen's exclusive vendor for this combined process and then ship them back to MAG in Israel for completion. Instead, Greenkote provided a solution that enabled MAG to do the work at its own facilities, which enabled it to complete the process in one location without overriding Volkswagen's exclusivity agreement.
According to Laor, Greenkote's process "reduced MAG's costs by 20%, improved logistics because it enabled them to complete the coating process in its own facilities and provided additional cost savings by improving corrosion resistance and because it was less likely to cause an environmental problem once the cars are junked (Europe's End of Vehicle Life legislation)," he said.
Outside of automotive, Greenkote--established in 1999 as Summet Hi-Tech Coatings Ltd.--has had its products specified on some rather high profile structures, including Heathrow Airport's new terminal five, the Oval cricket stadium and the Wembley stadium bridge in the UK. Now, the company has set its sites on the U.S. market, having established a new sales and support team there two years ago. According to Laor, Greenkote is in "several negotiations with leading U.S. companies for licensing/JV agreements."
One area in which fighting corrosion is absolutely critical is infrastructure, especially bridges. Premature failures hit government coffers hard, but there is also the risk of injury (or worse) to those who commute on them daily.
In the UK, Edinburgh's Forth Road Bridge, which opened to traffic in 1964, was originally meant to have a lifespan of 120 years. But a recent engineering study commissioned by the bridge's operator found that corrosion on the main cables was so severe, the bridge would have to be closed to trucks in 2013 and to cars by 2019. Estimates for a replacement bridge are in the area of 1 billion [pounds sterling], according to reports in local papers.
To avoid such troublesome and expensive premature failure in all types of applications, the entire supply chain needs to come together to develop better solutions. On the coatings side, that means raw materials suppliers and coatings formulators need to deliver technologies that offer superior protection but still meet regulations.
This trend was echoed by Tony Gichuhi, R&D manager at Halox. "There is a steady shift toward implementing heavy-metal free anti-corrosives because of the human and environmental stigma associated with hexavalent chromates, cadmium, zinc and barium-based corrosion inhibitors," commented Gichuhi, who said his company is designing heavy-metal free products and educating customers on the best ways to reformulate protective coatings with non-toxic corrosion inhibitors. In addition, Gichuhi said there is growing demand for new technologies, such as hybrid corrosion inhibitors that maximize anti-corrosion efficiency without adding cost to paint formulations.
Offering safer technologies is a goal for all coatings formulators, especially for those that operate in the EU and elsewhere where deadlines loom for solvent reduction and other safety and health issues.
For SigmaKalon, the goal is to balance performance and enviromnental issues--and still fulfill customers' tough requirements. "We are very aware of health concerns and CMR concerns. We want to be proactive and respond to customers concerns," said Philippe Desberg, general manager, anti-corrosion division, SigmaKalon France. According to Desberg, SigmaKalon is looking to replace current formulations that have "warning labels" as well as offer lower VOC products. "We are actively looking at alternative solutions. We are working closely with labs of SigmaKalon and Freitag to develop solutions to the progressive and unavoidable trend to lower VOCs. With anti-corrosive coatings, upcoming legislative, health and environmental issues will continue to be the drivers."
Freitag Goes "Pret Porter"
SigmaKalon brand adds new anti-corrosion line for contractor market.
Freitag, part of the SigmaKalon stable, has been one of the most active players in the French anti-corrosion market for the past century, being specified for several well known structures such as Charles de Gaulle airport and the Millau Bridge and having strong relations with specifiers for Total, Exxon and Shell, among others.
"Freitag was aimed at large contractors with upstream work in terms of specification," said Philippe Desberg, general manager, anti-corrosion division, SigmaKalon France. Yet while smaller contractors recognized the high performance Freitag delivered in terms of corrosion control, the current range wasn't a perfect fit for their needs.
For these customers "it was difficult to find products, and to be really satisfied with what we had--sophisticated paint systems in large packs, five gallon pails, that had rather difficult names," said Desberg. But SigmaKalon recognized the potential of offering a "well adopted assortment, while still capitalizing on the image of Freitag."
In September, the firm launched new Fer et Sol, a range of 14 products, which it is billing as a comprehensive answer to all painting problems likely to be encountered on site. The line features easy-to-remember names that explain their intended use and are packaged in smaller sizes (1L, 3L and 15L) that are ideal for the needs of smaller firms and individual painters, according to the company.
In addition, the new approach--which Desberg equated to Christian Dior making pret h porter--allows the company capitalize on its "active position" in the deco markets; it has 160 points of service outlets where it sells deco products in France. Fer et Sol will be distributed throughout those outlets as well as independent distributors.
Below is a list of corrosion control technologies available from select suppliers. For more information on these products, please contact the companies directly.
Halox, Div. of Hammond Group, Inc.
219-933-1560 * www.halox.com
Halox 430: A non-toxic, heavy-metal free anticorrosive pigment designed for waterborne and solventborne coatings. Halox 430 provides ion scavenging and passivation mechanisms to combat corrosion. It is recommended as a chromate alternative for coil coatings over multiple substrates.
Halox 630 HF: An organic liquid corrosion inhibitor in a HAPs-free solvent designed for maintenance coatings (epoxies, urethanes, alkyds). It functions as an adhesion promoter, barrier enhancer, and synergy complement for anticorrosive pigments such as zinc phosphate.
Fairless Hills, PA
Heucophos ZCP-Plus: Heucophos ZCP-Plus is a new anti-corrosive pigment for universal use. It has been developed to meet the demand of corrosion control coatings based on conventional and modern resins, such as high solids, waterborne and powder.
Heucophos ZAM-Plus: Heucophos ZAM-Plus is a new anti-corrosive pigment for universal use. It has been developed to meet the demand of corrosion control coatings based on conventional and modern resins, such as high solids, waterborne and powder.
Huber Engineered Materials
HuberGuard CAIO0 barrier pigments: Provides optimum pigment/binder interface, creating a more continuous system in your coating. Reduces the permeability of paint film to corrosive agents.
513-793-7766 * www.michem.com
Michem Prime: These copolymer dispersions offer specific adhesion to metal as well as barrier properties that can improve corrosion resistance of water-based coatings. Based on functionalized ethylene copolymers, film-forming at room temperature, water- and chemical-resistant, tough, flexible and cross-linkable. Additional features include adhesion to glass, polyethylene, EPDM and polyamide.
RustBan 250: Based on vapor corrosion inhibition technology, this is a coater-ready product for paper packaging. Exposed metal parts--can, auto parts, machinery--are prone to rusting during storage and transit. RustBan 250 coated packaging eliminates manually wrapping parts in VCI paper before packaging.
Moly-White Pigments Group
216-566-1294 * www.moly-white.com
Moly-White 1010 (ED-Plus): A high performance zinc molybdate based corrosion inhibitor recommended for solvent-based coatings. Specially milled for ease of dispersion and compatibility in thin-film systems, including coil coatings. It is non-hazardous and offers chromate equivalent performance in many applications.
Moly-White MZAP: A highly effective and versatile corrosion inhibitor based on calcium zinc phospho-molybdate. Can be used in water- and solvent-based coatings formulations.
PhosGuard J0852: A conventional zinc phosphate, PhosGuard J0852 is a highly versatile and cost-effective lead- and chrome-free corrosion inhibitor that often is used in aqueous and non-aqueous coatings, due to its relative chemical inertness. Also offers low oil absorption and minimal effect on color and hiding.
Pigments PhosGuard J0855: This activated zinc phosphate is formulated to be an economical drop-in replacement where conventional zinc phosphate can't provide adequate corrosion protection in non-toxic formulations. Offers the same stability, broad compatibility, low oil absorption and minimal effect on color and hiding as conventional zinc phosphate.
Christine Canning Esposito
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|Author:||Esposito, Christine Canning|
|Date:||Feb 1, 2006|
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