Practical Estimation Method of Anti-corrosion Performance Based on Physical Properties Evaluation of Glass-fiber Reinforced Plastic Based on Unsaturated Polyester Resin Used in Petroleum Fuels for a Long Period

Practical Estimation Method of Anti-corrosion Performance Based on Physical Properties Evaluation of Glass-fiber Reinforced Plastic Based on Unsaturated Polyester Resin Used in Petroleum Fuels for a Long Period

Gasoline

Electrochemical impedance spectroscopy

Wave propagation

Electrochemical corrosion

Oil tanks

Steel corrosion

Fiber reinforced plastics

Fourier transform infrared spectroscopy

Acoustic wave velocity

Infrared imaging

Polyester resins

Unsaturated polymers

The effectiveness of glass-fiber reinforced plasticsGFRPmay decrease with age. This research aims to develop a quantitative healthanti-corrosion performancediagnosis method of the GFRP that applied inner surface of steel oil storage tanks during open inspections. To achieve this purpose, the degradation characteristics of the GFRP based on an unsaturated polyester resin coated steel plates that have been in contact with petroleum fuelskerosene, diesel oil, regular gasoline and premium gasolinefor approximately 17 years were investigated by physiochemical techniques. The results of electrochemical impedance spectroscopy measurements which can quantitatively evaluate anti-corrosion performance, show that the electrical properties of GFRP decrease with long-term use. FT-IR measurements suggest that the decrease in electrical properties is due to swelling, where the hydrocarbons permeate inside the resin and open up its network structures. The swelling could also be detected by the longitudinal speed of sound of the GFRP, which is related to mechanical property such as the hardness. Finally, based on the assumption that changes in electrical and mechanical properties are brought about by the swelling, a practical method for estimating anti-corrosion performance of the GFRP in field from the longitudinal speed of sound is proposed. 2023 Japan Society of Corrosion Engineering. All rights reserved.

10-21

1

72

Tokutake, Koya

Zairyo to Kankyo/ Corrosion Engineering

2023

journalArticle

9170480

10.3323/jcorr.72.10

http://dx.doi.org/10.3323/jcorr.72.10