{'fraction_non_alphanumeric': 0.03278688524590164, 'fraction_numerical': 0.009687034277198211, 'mean_word_length': 5.160550458715596, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Study of the corrosion inhibition of copper in synthetic seawater by Equisetum arvense as green corrosion inhibitor

Extract of the stems of Equisetum arvense was studied as green corrosion inhibitor (GCI) in synthetic seawater exposing samples of copper. In order to determine the protection of the metal by the GCI, electrochemical tests were performed using potentiodynamic polarization curves (PPC), electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) at room temperature. The morphological characterization of the material with and without GCI was carried out by scanning electron microscopy (SEM). The chemical composition of the GCI was determined by Fourier transform-infrared spectroscopy (FTIR) and gas chromatography coupled to mass spectrometry (GC-MS). The results showed that Equisetum arvense acts as a mixed-type GCI, achieving an inhibition efficiency (IE) of 53.78% when using 1000 ppm of GCI from PPC. From EIS the charge transfer resistance increased in the first 21 h, obtaining an IE of 87.5%. LPR results showed similar behavior than EIS at the same concentration. FTIR revealed that the chemical structure of the compounds of methanol extract of Equisetum arvense have functional groups such as: -OH, C-H, C=O and C-O, whereas GC-MS showed that eight compounds are present in the GCI.