Evaluation of Desulfovibrio vulgaris adherence on three different polymeric coatings.

VIERA, M.; RASTELLI, S.E.; GOMEZ DE SARAVIA, S.G; NICOLINO, S; RODRIGUEZ BAUSADA, V; BRUNO, S; ZAPPONI, M; CASTRO, P

Congreso; XI Congreso Latinoamericano de Corrosión; 2018

NACE Latinoamerica&NACE International

Microbiological Induced Corrosion is a big concern in oil and gas market, mainly in water injectors andisposal wells in which the alternatives of candidates materials are: CRA´s with very high PREN(Pitting Resistance Equivalent Number) or coated carbon steel. Organic coatings are used on theinternal tube surface to prevent corrosion problems in service. The failure mechanism of thesecoatings in MIC environments is not well understood.In this study three different types of polymeric coatings were evaluated. Small coupons were preparedin laboratory and were exposed to SRB (Desulfovibrio vulgaris) in Postgate C culture medium (initialnumber of bacteria was106 bacteria/ml).Steel coupons of API L 80; martensitic L80 Cr13 stainless steel, and Highly Alloyed Austeniticstainless steel were also exposed in the biotic media. Flasks were incubated under anaerobicconditions for 14 days in the first stage, and 60 days in the second stage, with periodically freshnutrient replacement.After each stage of testing, the MIC-associated biofilm was evaluated using Scanning ElectronMicroscope. Coated coupons were also characterized using FTIR, adhesion tests, color and gloss