Ambient Atmosphere Research Articles

Using a New Pt(II) Source to Make Pt(II) Lantern-Shaped Cages, Including Low-Symmetry, Heteroleptic, and Multicavity Examples.

Current synthetic methods towards Pt(II) lantern-shaped cages involve the use of dry solvent, inert atmosphere, lengthy reaction times, and highly variable yields if isolated. Starting materials such as [Pt(CH3CN)4](BF4)2 suffer from a poor shelf-life, reducing the synthetic accessibility of various Pt(II) architectures. A new Pt(II) source (with varied counterions), [Pt(3-ClPy)4](X)2 (3-ClPy=3-chloropyridine, X=BF4 -, OTf-, NO3 -), is developed and characterised, showing greatly enhanced shelf-life characteristics under ambient atmospheric conditions. Using this starting material, the assembly of Pt(II) lantern-shaped cages was completed in as little as 1.5 hours with wet solvent and ambient atmosphere. The first examples of low-symmetry, heteroleptic and multicavity Pt(II) lantern-shaped cages are reported using this approach. Attempts towards an M6L8 octahedron using a tritopic ligand instead generate an interesting M2L4 cage with unbound pyridyl arms. Ligands and cages are characterised by NMR spectroscopy, IR spectroscopy, mass spectrometry, and X-ray crystallography in some cases.

Efficient extraction of uranium(VI) in aqueous solution by contact-electro-catalysis

The efficient and eco-friendly extraction of uranium(VI) from nuclear wastewater continues to pose a significant challenge. Herein, an innovative approach of contact-electro-catalysis (CEC) has been employed for the extraction of uranium from aqueous solutions. Commercial polytetrafluoroethylene (PTFE) was utilized as a trigger catalyst to generate e-, ·O2− and H2O2 under ultrasonic stimulation. These then react with uranyl ions to yield (UO2)O2⋅2H2O precipitates, facilitating efficient and selective extraction of uranium. In the absence of sacrificial agents, without the requirement of material preparation, and ambient atmosphere conditions, the removal rate of U(VI) at concentrations ranging from 1 to 100 mg/L under ultrasonic action (40 kHz, 180 W) exceeded 95 %. Additionally, it showed significant selectivity in the presence of coexisting ions. Furthermore, PTFE exhibits remarkable reusability in the process of uranium removal by CEC owing to its outstanding physicochemical stability. Notably, 82.6 % of U(VI) in actual low-concentration uranium-containing wastewater was extracted through CEC, confirming this method holds a promising application prospect. Our findings offer a convenient and eco-friendly strategy for effective and efficient extraction of uranium from nuclear wastewater based on the CEC, demonstrating powerful potential for practical applications.

Fruit Sorting Based on Maturity Reduces Internal Disorders in Vapor Heat-Treated ‘B74’ Mango

Postharvest internal disorders (IDs) in mango fruit present a significant challenge to the industry, with their underlying causes still unclear. This study investigated the relationship between fruit maturity and the susceptibility of vapor heat-treated (VHT) ‘B74’ mangoes to IDs in three experiments. In the first experiment, fruit were categorized into three maturity groups based on dry matter content (DMC): <15%, 15–17%, and >17%, using a handheld near-infrared device. Half of the fruit in each group underwent VHT, while the remainder were untreated controls. Flesh cavity with white patches (FCWP) was the only disorder observed exclusively in VHT fruit. The incidence and severity of FCWP was significantly higher (p < 0.05) in fruit with <15% DMC, with 12.4% incidence and a severity score of 0.2 on a 0–3 scale (0: healthy and 3: severely affected), compared to more mature fruit. In the second experiment, the fruits were harvested at early and late maturity stages, with average DMC values of 14.5% and 17.4%, respectively. The fruit was subjected to no VHT, VHT, and VHT following a 12 h pre-conditioning period at 37 ± 1 °C. Consistent with the first experiment, FCWP was observed only in VHT fruit, with early-harvested fruit displaying a significantly higher (p < 0.05) FCWP incidence (26.9%) and severity (0.3) compared to late-harvested fruit (8.3% incidence and 0.1 severity). Pre-conditioning significantly reduced FCWP, particularly in early-harvested fruit. In the third experiment, fruit maturity sorted based on density was assessed, followed by VHT and simulated sea freight under controlled (CA) and ambient atmospheres. Fruit density did not effectively differentiate maturity considering DMC as a maturity indicator. Storage conditions significantly reduced (p < 0.05) flesh browning incidence from 71.1% under ambient conditions to 33.3% under CA. This study highlights fruit maturity as a key factor in the susceptibility of ‘B74’ mangoes to postharvest IDs following VHT. Therefore, sorting fruit based on DMC at harvest or at the packing facility prior to VHT serves as a valuable decision support for reducing IDs in VHT fruit. Further research will explore advanced technologies to enable rapid and efficient fruit sorting based on DMC.

Effect of silane-doped argon shielding gases for gas metal arc welding of S355

Abstract The welding of steel grades relies primarily on the interaction of the weld metal with doped oxygen components of the shielding gas. This mainly serves to decrease the viscosity and reduce the surface tension of the melt in order to achieve an adjusted material transition. Interference with the ambient atmosphere is undesirable in this context. In order to prevent material-related changes in the microstructure, slag initiators are admixed which promote the precipitation of low-density oxides on the weld seam surface. Manufacturing technology is increasingly striving to eliminate the interaction of atmospheric oxygen in the production process. It is primarily intended to counteract the negative effects of oxygen during manufacturing. For this objective, silane-doped gases for subtractive manufacturing processes and additive manufacturing via the PBF-LB/M process have been considered. Small amounts of silane in conventional inert shielding gases allow partial pressures of oxygen that are comparable to a high vacuum. In the scope of this publication on investigations for welding applications, blind welds on S355 substrate plates were performed using G3Si1 filler material. In addition to the recommended M21, an argon shielding gas with 1.5% silane doping and argon 4.6 are applied for welding. Apart from the observation of the resulting energy input, the weld seams are metallographically characterized. For this purpose, the formation of silicates on the weld seam surface and the development of the weld seam within the base material are investigated. The volume of the weld seam is reduced as a result of the silane doping compared to the M21 application. The composition of the weld metal is significantly influenced by the silane content, leading to an increased manganese content in particular. The silane doping results in an intensified formation of an acicular bainitic structure and an accompanying hardening within the weld metal.

Bench-Stable 2-Halopyridinium Ketene Hemiaminals as Reagents for the Synthesis of 2-Aminopyridine Derivatives.

2-Chloro-1-(1-ethoxyvinyl)pyridinium triflate and several other bench-stable N-(1-alkoxyvinyl) 2-halopyridinium triflates have been developed as reagents for the synthesis of valuable 2-aminopyridine scaffolds via unusually mild SNAr substitutions with amine nucleophiles. Advantages of this approach include an operationally simple mix-and-stir procedure at room temperature or mild heat and ambient atmosphere and without the need for transition metal catalysts, coupling reagents, or high-boiling solvents. The stable N-(1-ethoxyvinyl) moiety serves as a dual SNAr-activating group and pyridine N-protecting group that can be cleaved under thermal, acidic, or oxidative conditions. Preliminary results of other nucleophilic substitutions using oxygen-, sulfur-, and carbon-based nucleophiles are also demonstrated.

Specific and high-affinity adsorption of volatile organic compounds on titanium dioxide surface.

The interaction between metal oxides and volatile organic compounds (VOCs) from the ambient atmosphere plays an important role in environmental and catalytic applications. Previous scanning probe microscopy and x-ray spectroscopy studies revealed surprisingly that the TiO2 [rutile (110)] surface selectively adsorbed atmospheric carboxylic acids, which typically exist in only parts-per-billion concentrations. In this work, we used in situ sum-frequency vibrational spectroscopy to study the interaction between rutile (110) and typical VOC molecules, including formic acid, acetic acid, and formaldehyde. Spectra from all three adsorbed molecules on rutile (110) were similar to the rutile surface spectrum in the ambient atmosphere, showing a broad resonance near 2950cm-1 that can be attributed to the bridging bidentate adsorption of corresponding compounds. In contrast, on a fused silica surface, a molecular monodentate adsorption configuration was observed for all the molecules, with aliphatic carbons appearing to be the dominant adventitious species.

Rapid activation of a solution-processed aluminum oxide gate dielectric through intense pulsed light irradiation.

In this study, we report rapid activation of a solution-processed aluminum oxide gate dielectric film to reduce its processing time under ambient atmosphere. Aluminum precursor films were exposed to a high energy light-pulse and completely converted into dielectric films within 30 seconds (450 pulses). The aluminum oxide gate dielectric film irradiated using intense pulsed light with 450 pulses exhibits a smooth surface and a leakage current density of less than 10-8 A cm-2 at 2 MV cm-1. Moreover, dielectric constants of the aluminum oxide layer were calculated to be approximately 7. Finally, we fabricated a solution-processed indium gallium zinc oxide thin-film transistor with AlO x using intense pulsed light irradiation, exhibiting a field-effect mobility of 2.99 cm2 V-1 s-1, threshold voltage of 0.73 V, subthreshold swing of 180 mV per decade and I on/I off ratio of 3.9 × 106.

Identification of critical moisture exposure for nickel-rich cathode active materials in lithium-ion battery production

Nickel-rich cathode materials are crucial for improving lithium-ion battery performance due to their potential for high energy densities. However, their sensitivity to humidity demands cost- and energy-intensive dry room production environments. This study examined the storage stability of a surface-treated nickel-rich cathode (≈ 91 mol% nickel) under industry-relevant scenarios to assess the required atmospheres and the impact of short moisture exposure on material and cell performance. Calendered and non-calendered cathodes were produced in a dry room with a dew point of −60 °C and then exposed to dew points of up to −20 °C and ambient atmosphere (dew point ≈ 5 °C). Analysis showed that calendered electrodes were more susceptible to carbonate formation at higher dew points. Cycling tests of single-layer full-pouch cells indicated that carbonate impurities, predominantly present on electrodes stored in ambient conditions, reduced energy efficiency during formation but did not significantly affect long-term performance. These findings suggest that less stringent dry room requirements could reduce production costs and energy consumption for high-performance lithium-ion battery cells.

Using a New Pt(II) Source to Make Pt(II) Lantern‐Shaped Cages, Including Low‐Symmetry, Heteroleptic, and Multicavity Examples

Current synthetic methods towards Pt(II) lantern‐shaped cages involve the use of dry solvent, inert atmosphere, lengthy reaction times, and highly variable yields if isolated. Starting materials such as [Pt(CH3CN)4](BF4)2 suffer from a poor shelf‐life, reducing the synthetic accessibility of various Pt(II) architectures. A new Pt(II) source (with varied counterions), [Pt(3‐ClPy)4](X)2 (3‐ClPy = 3‐chloropyridine, X = BF4‐, OTf‐, NO3‐), is developed and characterised, showing greatly enhanced shelf‐life characteristics under ambient atmospheric conditions. Using this starting material, the assembly of Pt(II) lantern‐shaped cages was completed in as little as 1.5 hours with wet solvent and ambient atmosphere. The first examples of low‐symmetry, heteroleptic and multicavity Pt(II) lantern‐shaped cages are reported using this approach. Attempts towards an M6L8 octahedron using a tritopic ligand instead generate an interesting M2L4 cage with unbound pyridyl arms. Ligands and cages are characterised by NMR spectroscopy, IR spectroscopy, mass spectrometry, and X‐ray crystallography in some cases.

Impact of low-grade iron ore on sintering reactions: Rapid heating experiments and thermodynamic modeling

BackgroundSinter is a primary feedstock for blast furnace-based ironmaking. Recently, the proportion of low-grade iron ore, which contains a high amount of gangue (mainly SiO2), has been increasing in the sintering process. Therefore, the impact of increased SiO2 content on the quality of sinter needs to be clarified. MethodsIn this study, we designed a rapid-heating furnace to simulate the actual thermal profile of the sintering process. The effects of basicity values, sintering temperature, and atmosphere, on the microstructure and phase formation of the Fe2O3-CaO-SiO2 ternary mixtures during sintering reactions, are investigated using X-ray diffractometry and scanning electron microscopy. The experimental results are analyzed using CALPHAD-type computational thermodynamics. Significant findingsWe found that solid-state reactions dominate at the lower temperature of 1250 °C, while liquid-assisted sintering occurs at the higher temperature (1300 °C). As the SiO2 content in the sinter increases, the content of the calcium-ferrite bonding phase decreases, while the content of Ca2SiO4 and Fe2O3 increases. Regarding the role of the atmosphere, more calcium ferrite bonding phases form under a lower oxygen partial pressure compared to an ambient atmosphere, which facilitates the densification of the Fe2O3-CaO-SiO2 sinter. In addition, a guideline for sintering operation with low-grade iron ore is proposed.

Temperature dependent growth of ytterbium oxide as gate dielectric on silicon substrate via combination of nitrogen and oxygen ambient

The ongoing trend towards downsizing silicon (Si)-based metal-oxide semiconductor (MOS) devices has led to constraints on the silicon dioxide (SiO2) gate dielectric due to increased leakage current through the thin SiO2. In this study, ytterbium oxide (Yb2O3) as a high dielectric constant (k) gate oxide material was deposited on a Si substrate and subjected to annealing at different temperatures ranging from 400 to 1000oC in a nitrogen-oxygen-nitrogen ambient atmosphere. The successful formation of Yb2O3 was verified using X-ray diffraction (XRD), Fourier transform infrared (FTIR), and ultraviolet–visible (UV–VIS) spectroscopy. The FTIR analysis indicated that Yb2O3 gate dielectrics post-annealing exhibited Yb-O bonding due to oxygen diffusion, as well as N-O bonding and NO3-bonding, demonstrating the formation of a nitrogen barrier at the interface to hinder oxygen diffusion. The optical band gap values of Yb2O3 gate dielectrics post-annealing ranged from 3.092 eV to 3.267 eV. Notably, the Yb2O3 gate dielectric annealed at 800 °C showed no breakdown within the 0–3 V range across all samples. The acquisition of a high k value of 19.40 and a low effective oxide charge (Qeff) of 5.32 x 1011 cm−2, along with the superior I-V characteristics, suggest that the Yb2O3 gate dielectric annealed at 800oC has the potential to be employed for next generation MOS applications.

Advances and challenges in inorganic lithium solid electrolytes

Lithium-ion battery (LIB) is the most widely used secondary battery and has been extensively studied in the past few decades due to its many advantages compared to other secondary batteries, such as higher energy density and better cycling performance. Considering the potential risks of environmental pollution and fire hazard induced by leakage or overheating of conventional electrolytes composed of flammable organic solvent-dissolving Li salts, non-flammable solid electrolytes (SEs), especially ceramic electrolytes with different structural types have been developed to improve the safety performance of LIBs. As the properties of SEs significantly depend on the microstructure, this review systemically summarized the recent progress in inorganic solid electrolytes based on the classification of microstructure and presented the relevant discussion in detail, including the microstructures, the mechanisms of Li ionic migration and performance optimization. Additionally, several challenges for realizing industrial application of SEs, such as lower ionic conductivities compared to liquid electrolytes and unsatisfactory stability in ambient atmosphere were mentioned. To effectively boost the development of SEs, more advanced transmission electron microscopy and atom probe tomography should be considered to deeply investigate the relationship between microstructure and properties in the future.

1,12-dodecanediol among similar fatty alcohols as a phase change material for thermal energy storage

The majority of research conducted on phase change materials (PCMs) is focused on applicable temperature-based materials. In general, the market offers a limited range of viable alternatives for a number of specific applications. In this study, the 1,12-dodecanediol compound was evaluated as a PCM in its original ambient storage atmosphere. The physicochemical properties of a PCM ultimately determine the conditions under which it can be employed in a given application. Many of these properties, including phase change temperatures, enthalpies, specific heat, and temperature-time relationships, are determined using differential scanning calorimetry (DSC) instruments. In summary, the phase change temperature and enthalpies of 1,12-dodecanediol were found to be 80–76 °C and 238–237 J g⁻¹, respectively, for heating/cooling. Moreover, TGA is used to ascertain the maximum temperature that a common PCM is capable of withstanding. The first degradation temperature of 1,12-dodecanediol (220 °C) was considerable as compared to other organic PCMs. Further thermal analysis of a new PCM may involve thermal conductivity and its potential to increase using conventional additives. The investigation was conducted on 1,12-dodecanediol across the aforementioned aspects. The surface morphology of both the 1,12-dodecanediol and 1,12-dodecanediol/expanded graphite (EG) composites was examined below the phase change temperature using a polarized optical microscope (POM) to reveal surface morphology of 1,12-dodecanediol as the crystalline organic material.

Highly efficient catalytic activity of MXene Nanosheet supported on CuFeO2 nanoparticles applied on hydrogen evolution

The development of efficient and clean renewable energy to replace fossil fuels has been a prominent topic in recent years, with HER in the field of renewable energy widely regarded as a promising avenue. The HER involves the adsorption and desorption of hydrogen ions, making the electron transfer rate particularly crucial. This study employed a novel chemical solution route under an ambient atmosphere to prepare highly crystalline hexagonal ferromagnetic material CuFeO2 nanoparticles. By incorporating the Nanosheet material MXene, forthputting its unique strong interlayer Van Der Waals forces, CuFeO2 is embedded within the layers of MXene. Compounding CuFeO2 with MXene increases the active sites of the material, enhancing electron transfer rates and reducing the required potential for HER. The electrochemical impedance spectroscopy results demonstrated a significant reduction in resistance upon the addition of MXene. The best HER performance was observed in CFO-300mg MX, exhibiting the lowest overpotential of −0.5 V vs. RHE and a Tafel slope of 147 mV dec−1.

Solution‐Processed Multifunctional Thin‐Film Encapsulation of Perovskite Thin Films and Devices

Herein, the effect of multicomponent composite encapsulation on the stability of perovskite thin films and perovskite solar cells, as well as lead leakage upon water immersion, is investigated. The encapsulation is simple and low cost since it is entirely deposited by solution processed techniques in the ambient atmosphere. It consists of a spray‐coated composite layer sandwiched between two spin‐coated layers. The composite layer contains hygroscopic nanomaterials, oxygen scavengers, and lead adsorbing nanomaterials, which enables reduced lead leakage and improved stability of encapsulated perovskite during storage in ambient, immersion in water, as well as illumination in dry air. The encapsulation layers show high transmittance and did not have a significant effect on the short‐circuit current density and open‐circuit voltage despite the deposition of encapsulation in ambient air. The encapsulated devices retain 80% of their initial performance after 4 h of immersion in water.

Lanthanide‐Like Contraction Enables the Fabrication of High‐Purity Selenium Films for Efficient Indoor Photovoltaics

AbstractThe lanthanide contraction involves a reduction in atomic radius among f‐block elements below the expected level. A similar contraction is observed in group‐16 elements. The atomic radius of Se (117 pm) is slightly larger than that of S (104 pm) arising from the presence of d electrons, compared to the significant increase in atomic radius from O (73 pm) to S. This lanthanide‐like contraction contributes to Se's robust oxidative resistance. Here we report a selective oxidation strategy utilizing Se's strong antioxidative property to remove coexisting narrow‐band gap Te impurities from Se feedstocks. This strategy selectively oxidizes volatile Te impurities into involatile TeO2 that remains in the evaporation source, while only volatile Se deposits onto the substrate during the thermal‐evaporation deposition process. This enables the fabrication of high‐purity Se films possessing a wide band gap of 1.88 eV, ideally suited to the optimal band gap for indoor photovoltaics (IPVs). The resulting Se photovoltaics exhibit an efficiency of 20.1 % under 1000‐lux indoor illumination, outperforming market‐dominant amorphous silicon and all types of lead‐free perovskite IPVs. Unencapsulated Se devices show no efficiency degradation after 20,000 hours of storage in ambient atmosphere.

Lanthanide-Like Contraction Enables the Fabrication of High-Purity Selenium Films for Efficient Indoor Photovoltaics.

The lanthanide contraction involves a reduction in atomic radius among f-block elements below the expected level. A similar contraction is observed in group-16 elements. The atomic radius of Se (117 pm) is slightly larger than that of S (104 pm) arising from the presence of d electrons, compared to the significant increase in atomic radius from O (73 pm) to S. This lanthanide-like contraction contributes to Se's robust oxidative resistance. Here we report a selective oxidation strategy utilizing Se's strong antioxidative property to remove coexisting narrow-band gap Te impurities from Se feedstocks. This strategy selectively oxidizes volatile Te impurities into involatile TeO2 that remains in the evaporation source, while only volatile Se deposits onto the substrate during the thermal-evaporation deposition process. This enables the fabrication of high-purity Se films possessing a wide band gap of 1.88 eV, ideally suited to the optimal band gap for indoor photovoltaics (IPVs). The resulting Se photovoltaics exhibit an efficiency of 20.1 % under 1000-lux indoor illumination, outperforming market-dominant amorphous silicon and all types of lead-free perovskite IPVs. Unencapsulated Se devices show no efficiency degradation after 20,000 hours of storage in ambient atmosphere.

Polymerization kinetics of 3D-printed orthodontic aligners under different UV post-curing conditions

BackgroundThe purpose of the study was to measure the degree of conversion (DC) of direct-printed aligners (DPA) that were post-cured under ambient and nitrogen atmosphere at specific time intervals and investigate the kinetics of polymerization reaction of this material.MethodsA total of 48 aligners were produced in 4 printing series by a 3D printer with TC-85DAC resin (Graphy Inc). From each series of printing, 12 aligners were included. The aligners were divided into two groups according to their post-curing conditions. One group was post-cured under ambient air with the presence of oxygen and the other under a nitrogen atmosphere, both using the same UV post-curing unit recommended by the company. The aligners were post-cured at six different time intervals: 1, 2, 3, 5, 10, and 20 min. Each time interval included 8 aligners, with 2 aligners from each series. The DC of the cured aligners was measured by means of attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR) through acquisition of the respective spectra for each UV-curing condition. Statistical analysis was performed to compare the results and differences within each atmosphere post-curing protocol, as well as between the different selected atmosphere conditions. Statistical significance level was set at p-value ≤ 0.05.ResultsPairwise analysis between post-curing protocols showed statistically significant differences only at the first minute of polymerization. Post-curing with nitrogen did not yield statistically significant results across different time intervals. Post-curing in ambient air showed some significant differences on the 1st and 2nd minute of the post-curing process.ConclusionsAlmost complete double bond conversion was observed. Significant differences were observed only during the first minute of polymerization under the nitrogen atmosphere.

Influence of a suboptimal environment and sintering temperature on the mechanical properties of fused filament fabricated copper

Metal injection molding (MIM) processes are generally more cost-effective for the generation of metallic AM components. However, the thermal processing required to remove the polymer and sinter the metal powder is not well understood in terms of resulting mechanical response and damage evolution, especially in ambient atmospheres where contamination is present. This study aims to provide a range of achievable mechanical properties of copper produced using a MIM-based method called fused filament fabrication (FFF) that is post-processed in a nonideal environment. These results showed direct correlations between sintering temperature to multiple aspects of material behavior. In addition, Nondestructive Evaluation (NDE) methods are leveraged to understand the variation in damage evolution that results from the processing, and it is shown that the higher sintering temperatures provided more desirable tensile properties for strength-based applications. Moreover, these results demonstrate a potential to tailor mechanical properties of FFF manufactured copper for a specific application.

Laboratory-Scale Implementation of Standardized Reconstituted Geothermal Water for Electrochemical Investigations of Carbon Steel Corrosion

Currently, the demand for heat production by geothermal energy is increasingly strong amid the controversy surrounding non-renewable forms of energy. In France, the Dogger aquifer in the Paris Basin (DAPB) produces saline geothermal waters (GWs) that are hot (70–85 °C), anaerobic, and slightly acidic (pH 6.1–6.4), and are characterized mainly by the presence of Cl−, SO42−, CO2/HCO3−, and H2S/HS. These GWs are corrosive, while the well casings used are carbon steel. GWs have been continuously treated since the 1990s by corrosion inhibitors at the bottom of production wells to reduce water–steel interactions and scaling issues. Electrochemical experiments to optimize inhibitors were carried out on site, protected from the ambient atmosphere, with actual geothermal water, using water tapping at the wellhead. Currently, carbon steel corrosion/scaling, corrosion inhibition phenomenology, and kinetics evaluation remain important challenges. These issues are, of course, linked to the durability of installations. The novelty of our work consists of our validation of a modus operandi that properly reproduces, at the laboratory scale, operating conditions similar to those encountered on the types of geothermal installations. Particular attention was paid to characterizing waters and gases from 13 production wellheads that were modelled with PhreeqC® Version 3 hydrogeochemical software and the Thermoddem thermodynamic database for implementing standardized reconstituted geothermal water (SRGW), a well-balanced water representative of the major elements and dissolved gases of actual DAPB geothermal waters. The developed electrochemical setup enabled us to analyze corrosion mechanisms such as those observed on site and to investigate corrosion inhibition using petrosourced and biosourced inhibitors. The modus operandi constitutes a reference for further investigations, at the laboratory scale, of corrosion inhibition. These investigations may include screening and optimizing the formulas of petrosourced and biosourced inhibitors for use in DAPB waters.