当前位置: X-MOL 学术Bioelectrochemistry › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Investigating the microbial-influenced corrosion of UNS S32750 stainless-steel base alloy and weld seams by biofilm-forming marine bacterium Macrococcus equipercicus.
Bioelectrochemistry ( IF 5 ) Pub Date : 2020-05-06 , DOI: 10.1016/j.bioelechem.2020.107546
D Arun 1 , R Vimala 2 , K Devendranath Ramkumar 1
Affiliation  

This study investigates the microbial-influenced corrosion of UNS S32750 super-duplex stainless-steel joints fabricated using different welding methods. Herein, the samples were introduced into a medium inoculated with Macrococcus equipercicus isolated from a marine environment. Confocal laser scanning microscopy and atomic force microscopy were used to characterise the topography and formation of pits in the corroded samples, respectively. Potentiodynamic polarisation studies were conducted on both the base alloy and weld seams exposed for 30 and 60 days in the experimental system inoculated with M. equipercicus and un-inoculated system. Results indicate that the thickness of the biofilm formed due to this bacterium increased and became heterogeneous with an increase in the exposure time, thereby resulting in micro-pits. Bacterial colonisation was observed in all the coupons after exposure to the inoculated medium. Although micro-pits were observed in all the coupons, the base metal and flux-cored arc weld seams showed highest sensitivity to bacterial attack.

中文翻译:

研究形成生物膜的海洋细菌马氏微球菌对UNS S32750不锈钢基合金和焊缝的微生物影响腐蚀。

本研究调查了使用不同焊接方法制造的UNS S32750超双相不锈钢接头的微生物影响腐蚀。在此,将样品引入接种有从海洋环境分离的马氏大球菌的培养基中。共聚焦激光扫描显微镜和原子力显微镜分别用于表征腐蚀样品的形貌和凹坑的形成。在接种了M.perpercicus和未接种系统的实验系统中,对暴露30天和60天的基础合金和焊缝进行了电位动力学极化研究。结果表明,由于该细菌而形成的生物膜的厚度增加,并且随着暴露时间的增加而变得异质,从而产生微坑。暴露于接种的培养基后,在所有试样中均观察到细菌定植。尽管在所有试样中都观察到微坑,但母材和药芯焊丝对焊缝的敏感性最高。
更新日期:2020-05-06
down
wechat
bug