Presentation Title

Microbiologically Influenced Corrosion in Marine Environment – Surface Roughness Effects

Faculty Mentor

Dr. Vilupanur Ravi, Chemical and Materials Engineering, Cal Poly Pomona

Start Date

17-11-2018 1:45 PM

End Date

17-11-2018 2:00 PM

Location

C301

Session

Oral 3

Type of Presentation

Oral Talk

Subject Area

engineering_computer_science

Abstract

Microorganisms can influence the corrosion rate of metallic materials through a phenomenon known as microbiologically influenced corrosion (MIC). MIC can increase corrosion rates of metallic alloys utilized in corrosive environments, e.g., salt water corrosion experienced in marine infrastructures, thereby reducing the service life of these alloys. The objective of the current study was to determine whether the surface roughness of an alloy has a significant effect on its corrosion resistance in the presence of microorganisms. Three test coupons each (N = 3) of marine grade carbon steels and stainless steels (UNS G10180, UNS S30400 and UNS S31603) were ground to multiple finishes (80 grit, 600 grit and 0.05 µm) to achieve various surface roughnesses. The cylindrical test coupons, each 6.0 ± 0.2 mm long and with a diameter of 13 ± 0.1 mm, were immersed in biologically active seawater in the vicinity of the port of Los Angeles. The mass differences between pre-and post-corroded coupons were recorded and the corrosion rates were determined using an equation per the ASTM G102 standard. Post-test coupons were examined using optical and scanning electron microscopy coupled with energy dispersive spectroscopy (SEM/EDS). The overall trend was that corrosion rates decreased with increasing exposure time possibly due to the formation of a biofilm inhibiting further corrosion. The surface roughness effects were more nuanced with different trends being exhibited by the different alloys.

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Nov 17th, 1:45 PM Nov 17th, 2:00 PM

Microbiologically Influenced Corrosion in Marine Environment – Surface Roughness Effects

C301

Microorganisms can influence the corrosion rate of metallic materials through a phenomenon known as microbiologically influenced corrosion (MIC). MIC can increase corrosion rates of metallic alloys utilized in corrosive environments, e.g., salt water corrosion experienced in marine infrastructures, thereby reducing the service life of these alloys. The objective of the current study was to determine whether the surface roughness of an alloy has a significant effect on its corrosion resistance in the presence of microorganisms. Three test coupons each (N = 3) of marine grade carbon steels and stainless steels (UNS G10180, UNS S30400 and UNS S31603) were ground to multiple finishes (80 grit, 600 grit and 0.05 µm) to achieve various surface roughnesses. The cylindrical test coupons, each 6.0 ± 0.2 mm long and with a diameter of 13 ± 0.1 mm, were immersed in biologically active seawater in the vicinity of the port of Los Angeles. The mass differences between pre-and post-corroded coupons were recorded and the corrosion rates were determined using an equation per the ASTM G102 standard. Post-test coupons were examined using optical and scanning electron microscopy coupled with energy dispersive spectroscopy (SEM/EDS). The overall trend was that corrosion rates decreased with increasing exposure time possibly due to the formation of a biofilm inhibiting further corrosion. The surface roughness effects were more nuanced with different trends being exhibited by the different alloys.