Materials Performance

JUN 2016

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 44 of 100

42 JUNE 2016 MATERIALS PERFORMANCE NACE INTERNATIONAL: VOL. 55, NO. 6 Nominate Your Work for an Award. Materials Performance magazine wants to recognize the hard work you put into solving today's corrosion control problems. We're going to award our Corrosion Innovation of the Year Awards to a select group of innovators who have created revolutionary solutions to combat corrosion and protect vital assets from its damaging effects. The n omination period begins July 1, 2016. To nominate your work or fnd out more information, visit TELL US ABOUT YOUR NOMINATION. COATINGS & LININGS ESSENTIALS Continued f rom page 40 corroded at 1 mm/y. Tis led the authors to investigate the potential ability of microor- ganisms to cause the degradation or dis- bondment seen on the pipeline coatings. Te authors requested reference samples of failed pipeline coatings from companies in the oil and gas industry, and received a FBE coating sample and two coal tar epoxy (CTE) samples. Quantitative polymerase chain reaction (qPCR) analysis was performed on DNA from the samples to quantify 10 types of bacteria known to cause MIC. Bioreactors were used to induce bioflms associated with MIC on coated UNS G10180 steel coupons. Forty coupons were coated with FBE, 16 coupons were coated with polyethylene (PE) tape, and four were left uncoated. Microorganisms were able to establish bioflms on both the coated and uncoated coupons in the bioreactor. Results showed that corrosion-inducing microorganisms not only formed bioflms on the coatings—in some cases at moderate levels—but im- pacted the coatings as well. Signs of corro- sion were seen on 18% of the FBE-coated samples and 33% of the PE tape-coated samples. After 37 and 39 days of exposure in a bioreactor, two FBE-coated samples exhib- ited pitting. Additionally, some FBE-coated samples as well as a sample with PE tape experienced coating failure 80 days after the initial inoculation. According to the authors, the test sug- gests a possible correlation between micro- bial activities and the erosion of common in- frastructure pipeline coatings. Te test also points to a possible correlation between mi- crobial activity and the disbonding of com- mon infrastructure pipeline coatings from the metal surface. Tis study shows that in cases of a failed coating, MIC- inducing or- ganisms should not be readily ruled out with traditional growth tests and that additional research is needed to understand the chem- istry regarding these failures. Also, the ability of a coating to withstand microbial activity is not fully understood and should be evalu- ated further. Advances Made in Epoxy Coating Technology Until the 1950s, the vast majority of coatings used for substrate protection were single- component or "one-pack" coatings that were supplied in one can in a ready-to-use condi- tion. Some of these products, particularly

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