Corrosion of metallic alloys is a concern worldwide, with impacts affecting different production sectors and consequent economic losses in the order of billions of dollars annually. Biocorrosion is a form of corrosion where the participation of microorganisms can induce, accelerate, or inhibit corrosive processes. In this study, it was evaluated that the changes in profile communities, by the sequencing of the 16S ribosomal gene, grown over steel coupons in a microcosm with no additional oxygen supplementation for 120 days. Analysis of abundance and diversity indices indicates marked changes in microbial structures throughout the 120-day period. Homology results of OTUs generated by Illumina sequencing indicated Proteobacteria phylum as the dominant group, comprising about 85.3% of the total OTUs, followed by Firmicutes and Bacteriodetes, both with 7.35%. Analyses at lower taxonomic levels suggested the presence of representatives described as corroders, such as Citreicella thiooxidans, Thalassospira sp., and Limnobacter thiooxidans. In conclusion, the results suggest that no additional oxygen supplementation profoundly altered the core of microbial communities, with a predominance of facultative anaerobic species.

中文翻译：

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在海水隔离的缩影中生长在1020碳钢表面上的微生物群落概况

金属合金的腐蚀是全世界关注的问题，其影响影响到不同的生产部门，并因此每年造成数十亿美元的经济损失。生物腐蚀是一种腐蚀形式，微生物的参与可以诱导，加速或抑制腐蚀过程。在这项研究中，通过对16S核糖体基因进行测序，评估了剖面群落中的变化，这些变化是在缩微条件下在钢试样上生长了120天，而没有额外的氧气补充。对丰度和多样性指数的分析表明，在整个120天的时间内，微生物结构发生了显着变化。通过Illumina测序产生的OTU的同源性结果表明，Proteobacteria phylum是占主导地位的群体，约占总OTU的85.3％，其次是Firmicutes和Bacteriodetes，两者均为7.35％。在较低的生物分类水平上的分析表明，存在着被描述为腐蚀剂的代表，例如硫氧化雪藻，海藻螺旋藻和硫氧化菌。总之，结果表明，没有额外的氧气补充可以显着改变微生物群落的核心，而主要是兼性厌氧菌种。