(Keynote) Corrosion of 1018 Plain Carbon Steel in Petroleum-Based and Renewable Diesel Fuel/Seawater Mixtures
Abstract
The substitution of biofuels for conventional fuels can result in unexpected issues and forms of corrosion. A study was conducted on corrosion rates and the identification of corrosion products that formed on plain-carbon 1018 steel (UNS G10180) exposed in seawater/fuel mixtures of petroleum-based F-76; a 50%:50% by volume (50:50 v/v) blend of F-76 and hydro-treated renewable diesel derived from algae (HRD-76); or HRD-76 for various time durations (i.e., 3 days, 10 days, 1 month, 6 months, and 1 year). The 1018 coupons were immersed in bottles with the bottom half of the sample submerged in the seawater layer and the top half in the fuel layer. The 1018 steel has a composition which is within specifications for steels typically used for pipelines and storage vessels and tanks. Energy dispersive X-ray analyses (EDXA), X-ray diffraction (XRD), Raman spectroscopy, and FTIR spectroscopy were used to identify the corrosion products. To differentiate between abiotic electrochemical corrosion and microbiologically influenced corrosion (MIC), various permutations of filtered and unfiltered fuel and seawater combinations were used as the exposure media. A 0.22 micron filter was used to produce sterile seawater and fuel. Both aerobic and anaerobic conditions were examined. Natural, off-shore, surface seawater and synthetic seawater according to ASTM International specifications were used in the study. Hence, the test conditions were aerobic or anaerobic of the following seawater-fuel mixtures: 1) filtered seawater/filtered fuel, 2) filtered seawater/non-filtered fuel, 3) non-filtered seawater/filtered fuel, and 4) non-filtered seawater/non-filtered fuel.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 23, 2020
- Source ID
- 10.1149/ma2020-02131300mtgabs
Entities
People
- Jan Kealoha
- Lloyd H. Hihara
- Shengxi Li