Corrosiveness of Palm Biodiesel in Gray Cast Iron Coated by Thermoreactive Diffusion Vanadium Carbide (VC) Coating

Ariel Amaya,Jhon Olaya,Oscar Piamba

doi:10.3390/coatings9020135

Ariel Amaya, Jhon Olaya + Show 1 more

Open Access

https://doi.org/10.3390/coatings9020135

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Abstract

Palm biodiesel is a currently used biofuel, principally as an additive or substitute of diesel fuel in vehicular internal combustion engines. In the present work, vanadium carbide (VC) coatings were deposited on gray cast iron (GCI) using the thermoreactive diffusion process (TRD) to evaluate the corrosiveness of palm biodiesel and compare it with gray cast iron corrosion behavior. VC coated and uncoated gray cast iron samples were tested by immersion corrosion tests (291 K and 313 K), cyclic oxidation test (CO), and the electrochemical impedance spectrometry test (EIS). The corrosion test showed the reduction of the corrosion rate for the VC coating when compared to gray cast iron. EIS tests of coated samples showed higher values of polarization resistance when compared with uncoated gray cast iron samples. Results confirmed that while biodiesel was more corrosive than diesel on both coated and uncoated gray cast iron, the VC coating was efficient in protecting the substrate exposed to both fuels.

Highlights

Some countries have included biodiesel as an alternative energy source because it is considered as a renewable fuel, technically competitive, biodegradable, and environmentally friendly when it is compared to fossil diesel fuel [1,2,3]
It is observed that the of biodiesel on gray cast iron (GCI) are higher than diesel on GCI, for all conditions tested
When the tests were performed at 313 K, the with the biodiesel-gray cast couple having the highest rate, which confirms the protection behavior corrosion rate increased, with the biodiesel-gray cast couple having the highest rate, which confirms of the vanadium carbide (VC) coating, since it reduced the corrosion rate by 40%

Summary

Introduction

Some countries have included biodiesel as an alternative energy source because it is considered as a renewable fuel, technically competitive, biodegradable, and environmentally friendly when it is compared to fossil diesel fuel [1,2,3]. The unsaturated esters tend to be more reactive, promoting autoxidation, photo oxidation, and hygroscopicity processes, which cause biofuel degradation and a more corrosive process [8,9] Due to these characteristics, biodiesel has been shown to be more corrosive than conventional diesel oil, affecting many materials that are in contact with it during its lifecycle, like polymers and metals alloys [10,11,12]. The wide range of raw material sources that can be used to produce biodiesel includes the palm oil tree, which stands out for its high productivity and profitability in tropical areas, such as Indonesia, Malaysia, and Colombia [13,14]

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