Abstract
BackgroundCorrosion is a serious problem all over the world. Most currently used approach to control corrosion have short comings which necessitates the search for novel materials that are green, cheap, from renewable source, and eco-friendly that can be used to combat this problem of corrosion control.MethodKhaya senegalensis fatty hydroxylamide (KSFA) was synthesized from K. senegalensis seed oil via simple reaction route involving esterification, transesterification, hydroxylation, and amidation reaction. KSFA was characterized using Fourier-transform infrared (FTIR), nuclear magnetic resonance (1HNMR), CHN elemental analyzer, particle size distribution (PSD), X-ray diffractometer, zeta potential, thermogravimetric analysis (TG), thermogravimetric-mass spectrometer (TG-MS), and scanning electron micrograph (SEM) coupled with energy dispersion spectroscopy (EDS). Inhibitory effect of KSFA on corrosion of aluminum (Al) in 0.5 M HCl was studied at different concentrations of KSFA and temperatures using weight loss method.ResultResult from gas chromatography (GC) revealed oil of K. senegalensis to predominantly contain C18:1 (68.46%) fatty acid. Hydroxyl and amide functional groups present in KSFA were confirmed by FTIR and 1HNMR. TG analysis revealed loss in mass around 80–190, 200–450, and above 450 °C while TG-MS revealed five different masses with m/z values 16, 17, 18, 28, and 44. Corrosion inhibition capacity of KSFA was by surface adsorption, which is spontaneous, and physisorption and described by Langmuir isotherm. The corrosion inhibition efficiency of KSFA increased with increase in its concentration while its corrosion rate reduced with increase in concentration.ConclusionThe inhibition efficiency of 90.43% exhibited by KSFA and the fact that KSFA was synthesized via non-hazardous process from a renewable sourced biomass is an indication that KSFA is a potential green and efficient inhibitor of corrosion in aluminum. KSFA is simple to use as an inhibitor and easy to prepare.
Highlights
Corrosion is a serious problem all over the world
The inhibition efficiency of 90.43% exhibited by Khaya senegalensis fatty hydroxylamide (KSFA) and the fact that KSFA was synthesized via nonhazardous process from a renewable sourced biomass is an indication that KSFA is a potential green and efficient inhibitor of corrosion in aluminum
The peak at 2.8 ppm was assigned to the OH group of the hydroxylated alkyl chain length in KSFA while the amide peak was seen at 7.3 ppm
Summary
Corrosion is a serious problem all over the world. Most currently used approach to control corrosion have short comings which necessitates the search for novel materials that are green, cheap, from renewable source, and eco-friendly that can be used to combat this problem of corrosion control. Corrosion of metal can be described as an electrochemical process involving the oxidation of anode coupled with a reduction reaction. During this process, metal is in contact with water or moisture in the atmosphere, and at such, the metal is the anode while the water is the electrolyte (Aylward and TJV 2002). The stability of the protective oxide is pH dependent and it is only stable within the pH range of about 4 to 8; the stability gets altered at pH less than 4 or at pH higher than 8 As a result, this exposes the Al to damage via corrosion. The use of biomass, which is biodegradable, nontoxic, readily available, and green as corrosion inhibitors, has the potential of circumventing this draw backs
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