THE ROLE OF SULFUR OXIDIZING BACTERIA ON CORROSION OF X65 LOW CARBON STEELS AND ITS MITIGATION USING SODIUM TUNGSTATE AND NICKEL BIOCIDES

THE ROLE OF SULFUR OXIDIZING BACTERIA ON CORROSION OF X65 LOW CARBON STEELS AND ITS MITIGATION USING SODIUM TUNGSTATE AND NICKEL BIOCIDES

Abstract:
Corrosion of steel infrastructure in various industries is a significant problem that leads to substantial economic losses and safety concerns. Sulfur-oxidizing bacteria (SOB) have been identified as a major contributor to microbial-influenced corrosion (MIC), particularly in the presence of sulfur-containing compounds. This study focuses on investigating the role of sulfur-oxidizing bacteria in the corrosion of X65 low carbon steels and explores the effectiveness of sodium tungstate and nickel biocides in mitigating this corrosion.

The research methodology involved conducting laboratory experiments to simulate the conditions conducive to MIC. X65 low carbon steel samples were exposed to a controlled environment containing sulfur-oxidizing bacteria and sulfur compounds, mimicking real-world scenarios. Corrosion rates were measured using electrochemical techniques, such as polarization resistance and electrochemical impedance spectroscopy. The effects of sodium tungstate and nickel biocides on corrosion mitigation were evaluated by comparing the corrosion rates of treated and untreated samples.

The results indicate a significant increase in corrosion rates of X65 low carbon steels in the presence of sulfur-oxidizing bacteria. The bacteria promote the formation of corrosive species, such as hydrogen sulfide, and create localized corrosion sites on the steel surface. This leads to accelerated corrosion rates and the degradation of the steel infrastructure.

However, the application of sodium tungstate and nickel biocides showed promising results in inhibiting the corrosion caused by sulfur-oxidizing bacteria. These biocides effectively suppressed bacterial activity and reduced the production of corrosive species. The corrosion rates of steel samples treated with sodium tungstate and nickel biocides were significantly lower compared to untreated samples.

The findings of this study highlight the detrimental role of sulfur-oxidizing bacteria in the corrosion of X65 low carbon steels and emphasize the importance of implementing effective mitigation strategies. The use of sodium tungstate and nickel biocides demonstrates their potential as corrosion inhibitors for steel infrastructure exposed to sulfur-oxidizing bacteria. Further research is recommended to optimize the application methods and investigate the long-term performance of these biocides in real-world conditions.

Keywords: Sulfur-oxidizing bacteria, microbial-influenced corrosion, X65 low carbon steels, corrosion mitigation, sodium tungstate, nickel biocides

THE ROLE OF SULFUR OXIDIZING BACTERIA ON CORROSION OF X65 LOW CARBON STEELS AND ITS MITIGATION USING SODIUM TUNGSTATE AND NICKEL BIOCIDES. GET MORE MATERIALS SCIENCE AND ENGINEERING

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