Effect of flavin adenine dinucleotide (FAD) on Desulfovibrio desulfuricans corrosion of pipeline welded joint

• Published in: Biofouling (Chur, Switzerland) Switzerland), 2024-10, Vol.40 (9), p.617-631
• Main Authors: Wang, Qin, Zhou, Xiaobao, Zhong, Zhen, Wang, Binbin, Tan, Zhuowei, Zhang, Minghua, Wu, Tangqing
• Format: Article
• Language: English
• Subjects: Adenine; Anaerobic conditions; Anaerobic microorganisms; Anoxic conditions; Bacteria; Bacterial corrosion; Base metal; Corrosion; Corrosion effects; Corrosion products; Flavin; Flavin adenine dinucleotide (FAD); Flavin-adenine dinucleotide; Heat affected zone; Heat affected zones; Inoculation; Microbiologically influenced corrosion (MIC); pipeline steel; Sulfate reduction; Sulfate-reducing bacteria; sulfate-reducting bacteria (SRB); Sulphate reduction; Welded joint; Welded joints; Welding
• ISSN: 0892-7014; 1029-2454; 1029-2454
• DOI: 10.1080/08927014.2024.2404204

The impact of Flavin adenine dinucleotide (FAD) on sulfate-reducing bacteria (SRB) corrosion of a pipeline welded joint (WJ) was investigated under anaerobic condition in this paper. The results showed that the thickness of the corrosion product on heat affected zone (HAZ) was lower than that on base metal (BM) and welded zone (WZ), and the FAD addition enhanced the development of the protruding microbial tubercles on the WJ. The local corrosion degrees of the BM and WZ coupons were significantly higher than that of the HAZ coupon. Besides, the FAD addition simultaneously promoted local corrosion of all three zones of the WJ in the SRB inoculated environment, and the promotion role was much more pronounced on the WZ coupons. The selective promotion effect of FAD on SRB corrosion in the WJ was attributed to the special structure of the WZ, the selected SRB attachment and the FAD/FADH 2 redox feedback cycle.