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September 17 - September 23, 2012

What generic types of coating materials best resist microbiologically induced corrosion (MIC)?

Selected Answers

From Guru Sankar of Sathya Hitec Solutions on November 4, 2012:
     As this coatings need to be applied in less than perfect conditions, many times on slightly damp surfaces, we have developed a formulation based on Coal Tar and CNSL Novalac Resin cured with CNSL based Phenolkamine Hardner. This normally lasts very long and also resists many types of microbial degradation.

From Dr Baloji Naik R of Naval Materials research laboratory on October 4, 2012:
Epoxy phenolic with proper paint formulation.

From massimiliano Lo Re of Studio mlr on September 16, 2012:
     Epoxy phenolic.

From Jerry Trevino of Protective Liner Systems on October 8, 2012:
     Most polymeric products such as amine-cured epoxies, polyurethanes, and urethanes will work in laboratory conditions. The major factor affecting the long-term performance of any of these generics is the application and the capability of the coating to be applied in less than perfect conditions. If the coatings are applied over corroded underground concrete such as a sewer environment, the concrete has long been saturated with contaminants and the concrete is always wet. The coatings must be able to cure and bond to the wet environment. In addition, the coatings or protective liners must also resist hydrostatic pressures, ground movements, buoyancy, cyclic freeze/thaw temps, wet and dry seasons, and other factors. MIC resistance is only one of many critical aspects of protective liner.

From Jeff Croll of Northern Corrosion Technologies on October 2, 2012:
     High-build epoxies and novolac epoxies both have long histories in corrosive wastewater environments. Vinyl esters should also be fine since the percent concentration of sulfuric acid doesn't generally become too high.

From Jacek Bordzilowski of CES on September 26, 2012:
     In my opinion, the best are inorganic coatings.

From William Slama of International Paint/Ceilcote Products on September 19, 2012:
     We have not found that high build coatings and linings are affected directly by MIC conditions. MIC normally results in buildup of hydrogen sulfide which will create an acidic environment and can of course be agressive to many materials. Vinyl ester systems are favored, but many epoxy systems are also resistant.

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Tagged categories: Coating chemistry; Coating Materials; Coating types; Corrosion resistance

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