Examination of Metal-Oxidizing Bacteria and Accumulated Corrosion Products on 300 Series Stainless Steels
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1
United States Naval Research Laboratory, United States
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2
United States Naval Research Laboratory, United States
The objective of this work is provide fundamental understanding of the relationship between metal-oxidizing bacteria, accumulated corrosion products and pitting in 300 series stainless steels. The 300 series stainless steel (SS) designation contains many different compositions but the common factors among them are: 18 wt% Cr and 8 wt% Ni (18-8). 300 series SS is routinely used in naval systems, e.g., fuel transfer lines. However, localized pitting on 300 series SS, especially at welds, has caused catastrophic failures of these materials. Pitting in these alloys has been investigated extensively and in most cases the failures have been diagnosed as microbiologically influenced corrosion without any demonstration of microorganisms or biomineralogy. Pitting is typically associated with tubercles or mounds of accumulated corrosion products attributed to the activities of metal–oxidizing bacteria (MOB). Tubercles on the surface of these alloys in oxygenated, chloride-containing waters causes under-deposit corrosion that initiates a series of events, leading to aggressive corrosion, i.e., fixation of a small anode surrounded by a large cathode, dissolution of metal at the anode, acidity under the tubercle and ingress of chloride. However, the structure, mineralogy and microbiology for tubercles on 300 series SS have never been examined in detail. Surface analytical techniques will be used to relate the chemical, mineralogical, electrochemical and magnetic properties of accumulated corrosion products on 300 series SS in waters containing MOB and chloride.
Keywords:
corrosion,
Microbiologically Influenced Corossion,
metal oxidizing bacteria,
Biomineralogy,
Stainless steel (3)
Conference:
National Organization for the Professional Advancement of Black Chemists and Chemical Engineers (NOBCChE) 45th Annual Conference , Orlando, Florida, United States, 17 Sep - 20 Sep, 2018.
Presentation Type:
Oral Presentation
Topic:
Enviornmental and Green Chemistry
Citation:
Brown
TT and
Lee
JS
(2019). Examination of Metal-Oxidizing Bacteria and Accumulated Corrosion Products on 300 Series Stainless Steels.
Front. Chem.
Conference Abstract:
National Organization for the Professional Advancement of Black Chemists and Chemical Engineers (NOBCChE) 45th Annual Conference .
doi: 10.3389/conf.fchem.2018.01.00031
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Received:
15 Oct 2018;
Published Online:
17 Jan 2019.
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Correspondence:
Dr. Jason S Lee, United States Naval Research Laboratory, Washington D.C., United States, jason.lee@nrlssc.navy.mil