Anticorrosion Performance Research Articles

Synergistic Effect of CNT and N-Doped Graphene Foam on Improving the Corrosion Resistance of Zn Reinforced Epoxy Composite Coatings

The synergistic effect of CNT and three-dimensional N-doped graphene foam (3DNG) on improving corrosion resistance of zinc-reinforced epoxy (ZRE) composite coatings was studied in this work. Although CNT itself was demonstrated to be effective to promote the anti-corrosion performance of the ZRE coating, the incorporation of additional 3DNG leads to further enhancement of its corrosion resistance under the synergistic effect of the hybrid carbon nanofillers with different dimensions. Both the content of the carbonaceous fillers and the ratio between them affected the performance of the coating. The optimal content of hybrid filler in the coating was determined to be only 0.1% with 3DNG:CNT = 1:3. With the modification of hybrid fillers, the corrosion current of the coating could be reduced by more than six orders of magnitude. Additionally, the immersion test of the pre-scratched coating directly demonstrated the evident contribution of the hybrid fillers to the sacrificial anode-based surface protection mechanism of the coating. These results confirmed the synergistic effect of the hybrid 1D and 3D carbonaceous fillers on promoting the corrosion inhibition of their coating, which could be promising for application in other functional composites.

Ag-doped PDA interface strategy for selective electron transition integrating EMI shielding and anti-corrosion performance

Metal-based electromagnetic interference (EMI) shielding composites are essential for ensuring electromagnetic compatibility but are often compromised by susceptibility to corrosion, especially in harsh environments. Existing strategies to mitigate coupling corrosion typically involve physical barriers, which inevitably hinder conductivity. In this study, we introduce a novel interface doping approach to fabricate lightweight Graphite@PDA/Ag@Ag composites that simultaneously enhance EMI shielding and corrosion resistance. The PDA/Ag layer selectively regulates electrons with different migration directions and energies to migrate, increasing charge transfer resistance at Ag/graphite interfaces and ensuring conductivity through a tunneling effect. This design achieves an ultralow corrosion rate of 4.313 × 10-8 μm/yr (a billionth that of 316L stainless steel) alongside superior EMI shielding effectiveness of 109 dB in the X-band at 1.5 mm thickness. Remarkably, the composite maintains over 90 dB shielding efficiency after 7 d in NaCl solutions across various pH levels. Furthermore, simulated corrosion under South China Sea conditions predicts a coating loss of less than 0.026 μm over 7 years. This work presents a transformative approach to mitigating coupling corrosion in EMI shielding materials, offering a practical route to high-performance, corrosion-resistant composites without the need for a protective topcoat.

Impressive reinforcement on the anti-corrosion ability of the commercial fluorocarbon paint via an amino groups modified graphene

The interaction with the matrix and the dispersion within the matrix hinder the realization of graphene's potential as an anti-corrosive filler. Herein, a -NH2 modified graphene-based filler (PS-PVP@NH2-rGO) was designed to simultaneously address these issues in the fluorocarbon resin (FEVE) coating. Reinforing FEVE coating with PS-PVP@NH2-rGO, the wear rate and the lowest-frequency impedance modulus after a 7-day immersion were found to be 0.35 times and 177.3 times those of FEVE coating respectively. Ultraviolet-Visible spectra confirmed the excellent dispersibility of PS-PVP@NH2-rGO. The designed differential scanning calorimeter experiment demonstrated the close interaction between PS-PVP@NH2-rGO and the FEVE matrix. Due to this close interaction, PS-PVP@NH2-rGO exhibited a high degree of dispersion within the FEVE matrix rather than self-aggregation, then concentrated the stress outside, absorbed energy produced during the friction process, and enhanced the coating's wear resistance. A complicated “labyrinth” was also created by the fillers. With chemical interactions, the fillers and the surrounding FEVE matrix formed an integrated whole, making the “obstacles” created by the fillers more significant. Consequently, the strong barrier effect resulted in superior anti-corrosion performances of PS-PVP@NH2-rGO/FEVE coating. Introducing -NH2 groups in was proven to effectively complete the coating, improve coating's quality and barrier effect, and finally prevent corrosive media. This study aims to provide design ideas and theoretical supports for high-performance heavy-duty anti-corrosive coatings.

Efficient conversion CuCl phase and improvement anti-corrosion performance of bronze via L-arginine: performance and mechanism study

Efficient conversion CuCl phase and improvement anti-corrosion performance of bronze via L-arginine: performance and mechanism study

A simple strategy to significantly improve the anticorrosion and aging resistance of epoxy coatings by adding polyaniline modified multi-walled carbon nanotubes

Epoxy coatings are widely used for corrosion protection of metals, but under extremely harsh environments, the epoxy polymer chains such as the C-O bonds of epoxy ether and aromatic ether, and the -OH in the epoxy chain structure can also undergo aging and degradation, leading to the failure of the coating in service. How to extend the anti-aging capability of epoxy resins while maintaining their other properties unchanged has become a major challenge in the practical application of epoxy coatings. In this study, the polyaniline (PANI) modified multi-walled carbon nanotubes (MWCNT@PANI) were synthesized by polymerization in-situ and added to epoxy resin as an anti-aging filler. The various measurements have been adopted to characterize the composition and structure of MWCNT@PANI, and the anticorrosive performance of the composite coating for carbon steel were evaluated via salt spray, chemical aging and UV light aging. Results showed that the impedance value of the blank epoxy coating decreases by at least two orders of magnitude after the salt spray tests, and the contact angle decreases by about 30° and gradually changes from hydrophobic to hydrophilic, indicating a significant decline in corrosion resistance. In contrast, the composite coating confirmed the excellent anti-aging performance, while the impedance values increased by approximately 2-5 orders of magnitude compared to that in blank epoxy coatings, and remained around 1010 Ω·cm2. Given the dense encapsulation of MWCNT@PANI, the dispersion stability between the filler and EP can be improved, and the effective corrosion resistance performance was also supported by molecular dynamic simulation. Besides that, the ability of free radical quenching along with the labyrinth effect and hydrophobic interaction have also been investigated to explain the anticorrosion and anti-aging mechanism.

Triggering the Interplay of sp2-sp3 Carbon-Assisted Sustained Tribofilm via Two-Dimensional Surface Modulation for Exceptional Wear Resistance of Steel Surfaces.

The relentless wear and friction of steel-based moving machinery have created ongoing challenges that hinder their industrial applications. One promising solution is the use of reduced graphene oxide (rGO) as a lubricant due to its excellent mechanical strength and promising tribological properties. However, its tendency to self-agglomerate presents a major hurdle for its practical use. This study aims to combat the restacking of rGO nanosheets by strategically intercalating self-assembled α-ZrP between the rGO layers, unlocking exceptional wear resistance in mild steel through hot-dip galvanization. The multilayer architecture of the developed coatings ensures lubrication through layer slippage during friction, while the coexistence of sp2-sp3 hybridized carbons further extends wear life, with the Zn-0.22/ZP_5@G coating exhibiting the highest wear resistance (0.277 × 10-7 mm3 N-1 m-1). The as-tailored composite coating, featuring a tribolayer composed of graphitic sp2 carbons, ZrO2, Zr(PO4)2, and Fe2O3, serves as an effective dissipative medium for contact stress. The formation of diamond-like sp3 carbons induced by the tribological process further contributes to the increased hardness of the resulting tribofilm. The reduced generation of the π-conjugated system in the composite prevents the movement of electrons toward the cathodic site, while the passivation effect induced by the composite effectively inhibits electrolyte permeation, resulting in substantial corrosion resistance. The exemplary wear resistance with remarkable anticorrosion performance achieved in this study offers significant improvement in the realm of hard coatings for mechanical applications, including moving machinery and manufacturing. Hence, the system can find effective use in such industries following the completion of relevant case studies.

Unveiling the potential of dual-extrinsic/intrinsic self-healing lignin-based coatings for anticorrosion applications

The development of self-healing ecofriendly coatings for anticorrosion applications provides stronger protection than passive coatings and mitigates the environmental pollution resulting from petroleum-derived coatings. Due to its intrinsic anticorrosion characteristics, lignin is a viable precursor for the formulation of self-healing anticorrosion coatings. However, the structural rigidity of lignin and the lack of self-healing functionalities in pristine lignin-based coatings hinder the comprehensive application of lignin in this field. Accordingly, we introduced Diels-Alder (DA)-based self-healing functions in the lignin-based coatings and meanwhile, the coatings were chemically conjugated with corrosion inhibitors to further improve the anticorrosion performance. A thin layer (16 μm) of the coating increased the Ecorr from −481 mV (for bare steel) to +91 mV and reduced the corrosion rate (CR) >4000 times. The dual self-healing properties of the coating are attributed to the synergistic action of the DA adduct and the conjugated corrosion inhibitor. Practically, in response to the emergence of microcracks in the coating structure, trace amounts of the corrosion inhibitor are released into the microcracks to form a protective layer on the unveiled metal surface. Simultaneously, DA adducts undergo reversible reactions at specific temperatures (80–120 °C) promoting complete restoration of the microcrack.

Robust waterborne superhydrophobic PAI/PTFE/GO@TP anion-release coating with anti-corrosion and anti-scaling performance

In oil well field production, fluids cause mechanical damage and chemical corrosion, increasing the demands on the adaptability and durability of superhydrophobic materials. For this purpose, a superhydrophobic/superoleophilic polyamideimide (PAI)/polytetrafluoroethylene (PTFE)/graphene oxide@tourmaline powder (GO@TP) anion-release coating was successfully developed using a combination of hydrothermal synthesis and spraying technology. The crosslinked network formed by the PAI and PTFE endowed the coating with exceptional mechanical durability and adhesion, maintaining a water contact angle of 151.5 ± 1.8° after enduring 800 wear cycles under 125 kPa of pressure. The homogeneous lamellar micro/-nanostructure provided a stable air barrier that shields the coating surface from contact with corrosive substances, ultimately enhancing its anti-corrosion performance. Following a 30-day soaking period, the coating demonstrated an impressive impedance modulus at low frequency, |Z|0.01 Hz value of 1011 Ω cm2. The slow release of hydroxyl anions from the tourmaline powder electrically neutralized, cations in water to form soluble salts, preventing the nucleation of the scale. The oil layer on the PAI/PTFE/GO@TP coating surface synergistically reduced water scale adhesion, resulting in only 0.23 mg/cm2 of scaling after 7 days. Moreover, the internal migration and surface arrangement of functional groups significantly improved the chemical stability and weather resistance of the coating. This study presented a feasible approach to expand the functional application of superhydrophobic coatings for anti-scaling and anti-corrosion.

Amino-grafted Ti3C2 MXene nano-sheets doped with zinc-phytic acid complex; An advance 2D-nanocarrier toward improving epoxy coating smart anti-corrosion performance

MXene's unique structure and properties endow it with new applications in corrosion studies, drawing the attention of material scientists. In the present study, the MXene sheets modified by 3-Aminopropyltriethoxysilane (APTES) were utilized as carriers of zinc cations and phytic acid (Ph) (F-M@Zn-Ph) and then introduced into the epoxy coating for smart anti-corrosion application. Characterization tests such as X-ray Diffraction (XRD), Fourier Transform Infrared (FT-IR) Spectroscopy, X-ray Photoelectron Spectroscopy (XPS), Thermogravimetric Analysis (TGA), Field Emission Scanning Electron Microscopy (FE-SEM), Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES), and zeta potential were carried out to validate the synthesis of F-M@Zn-Ph. The fabricated composite coatings' protective, and adhesion properties were studied by EIS, cathodic disbondment (CDT), salt spray (SST), and pull-off tests. Solution phase studies exhibited that the F-M@Zn-Ph sample inhibited mild steel corrosion up to 91 % during 48 h of immersion. Investigating the scratched coatings showed that the total resistance (RT) value for the F-M@Zn-Ph/EP sample enhanced by about 58 % compared to the Blank/EP during 48 h of immersion which denotes the self-healing properties of the coating. EIS results of the intact F-M@Zn-Ph/EP sample displayed the highest log|Z|0.01Hz value (10.83 Ω cm2) after 14 weeks of immersion. Along with the barrier properties improvement, the F-M@Zn-Ph/EP coating showed a small adhesion loss of 4 %.

Benzimidazole functionalized waterborne polyurethane with excellent mechanical properties, UV and corrosion resistance

Waterborne polyurethane coatings represented a viable substitute for conventional solvent-based coatings, primarily due to their eco-friendliness and straightforward application process. However, these coatings still encounter various issues such as corrosion, aging, and cracking during their actual application. In this research, a range of waterborne polyurethanes (MWPU) was developed by utilizing 4,4′-dicyclohexylmethane diisocyanate (HMDI) for the hard segment and polytetrahydrofuran ether diol (PTMG) as the soft segment, UV absorber benzimidazole (CR-455) as the functional monomer, and 2-mercaptobenzimidazole (MBI) as a corrosion inhibitor. A comprehensive investigation was conducted to evaluate the impact of varying MBI content on the characteristics of MWPU emulsions and films. The findings demonstrated that incorporating MBI led to enhancements in the comprehensive properties of MWPU films. Specifically, when the MBI content reached 1 wt%, MWPU exhibited optimal comprehensive performance, tensile strength reached 26.0 MPa, adhesion reached 2.02 MPa, water absorption measured at 3.2 %. It demonstrated excellent UV resistance and the anti-corrosion performance was additionally impressive, with the impedance modulus reaching 4120 Ω/cm2 at a frequency of 10−2 Hz. This can be mainly attributed to the unique benzimidazole structure in MBI and its ability to form chemical bonds with metal substrates. This innovative approach proposed in this study has the potential to expand applications for waterborne polyurethane in functional coatings.

Anticorrosion performance of PDA and WS2 synergistically modified graphene oxide/epoxy resin composite coatings

Anticorrosion performance of PDA and WS₂ synergistically modified graphene oxide/epoxy resin composite coatings

Robust Anticorrosive Polymer Thin Film for Reliable Protection of Ingestible Devices.

Ingestible devices (ID) provide a safe and noninvasive method for monitoring, diagnosing, and delivering drugs to specific sites in the human body, particularly within the gastrointestinal (GI) tract. However, the GI environment is highly acidic and humid, which can cause IDs to fail, and their corrosion in the acidic environment can cause leaching of toxic metal ions, thereby substantially limiting their long-term use. Thus, an efficient method is required to protect IDs, especially in the chemically and mechanically harsh GI environment. However, an anticorrosive polymer coating that can safeguard IDs in the GI environment without delamination or performance degradation has not been developed to date. The protective layer must satisfy several critical requirements, e.g., high biocompatibility, mechanical durability, and superior anticorrosion performance. This paper reports a highly cross-linked but submicron-thick siloxane-based anticorrosive polymer thin film that can be deposited directly onto IDs without damaging them. The 500 nm-thick cross-linked polymer coating demonstrates exceptional corrosion resistance and chemical and mechanical stability in the GI environment without cytotoxicity. A printed circuit board (PCB) coated with the developed ultrathin protective film sustained performance after exposure to a pH 1.00 phosphate buffered saline solution at 37 °C for 72 h without leaching of metal ions. The ID continued to operate effectively under such challenging conditions; thus, the developed film is suitable for applications that require prolonged functionality, e.g., diagnostics, drug delivery, and continuous health monitoring in the GI tract.

Long-term anticorrosion performance of a modifier-free Ni-graphene superhydrophobic coating

The inherent corrosion vulnerability of mild steel triggered by harsh environments significantly affects its service life and leads to economic losses. Superhydrophobic coatings have been developed to inhibit this issue, and the robustness and facile preparation processes of water-repellent surfaces are crucial for their application. Herein, this study investigated the long-term anticorrosion capability of a modification-free Ni-graphene superhydrophobic coating prepared on mild steel using electrodeposition. Immersion tests, electrochemical measurements, and surface analyses were conducted to verify its durability. The corrosion behavior of the as-prepared coating was characterized in two stages. In the initial stage, the air cushion between the hierarchical structures effectively reduced the direct contact area at the coating-electrolyte interface. Over an extended period, the graphene-embedded coating with refined grains exerted a durable shielding action by providing a tortuous diffusion path for the penetration of corrosive agents. Through in-depth exploration, the anticorrosion mechanism of the Ni-graphene superhydrophobic coating was synergistically determined by the superhydrophobic features endowed by the surface structure and the shielding effect provided by the inner structure, which offers potential guidance for addressing the demands for corrosion protection of mild steel in long-term service processes.

Fabrication and corrosion performance evaluation of LDHs@ZIF-67 composite coatings based on magnesium alloys AZ31

The widespread application of magnesium (Mg) and Mg alloys is limited by their poor corrosion resistance. The anti-corrosion performance of micro-arc oxidation (MAO) is not ideal enough. Therefore, this study fabricated various LDHs@ZIF-67 composite coatings on MAO-coated Mg alloy. The surface and interface structure, composition, corrosion stability and mechanism of the LDHs@ZIF-67 composite coatings were investigated. The results suggested that the MgCo LDHs@ZIF-67 coating represented the lowest corrosion current density (icorr = 2.51 × 10−8 A/cm2), the lowest corrosion rate (hydrogen evolution volume = 3.21 mL·cm−2) and the best corrosion resistance. The stable existence of LDHs and ZIF-67 structures synergistically integrated to produce a denser composite coating, enhancing the corrosion resistance of AZ31, and surpassing the limitations of individual materials in providing long-term corrosion protection. Such composite coatings are poised to offer efficacious solutions to prevalent metal corrosion issues.

Zn-Mn composite coating codeposited with two-dimensional carbon nanoplatelets for improving corrosion resistance

Zn coating is a typical anti-corrosion coating for carbon steel. Considering the sacrificial nature of Zn coating, it is essential to enhance the corrosion resistance for the long-term performance in the practical application. In this work, two-dimensional carbon nanoplatelets (2D-CNs) with nanometer thickness (∼100 nm) and ultra-large lateral size (10–40 μm) and Mn element have been successfully co-deposited with Zn onto low carbon steel by a simple electrodeposition method. Results show that the Zn-Mn/2D-CNs composite coating is composed of Zn phase, ZnMn3 phase and a small number of 2D-CNs. The Zn-Mn/2D-CNs composite coating exhibits a modified surface quality with ultrafine grains and smaller roughness (Ra = 176 nm, Rq = 131 nm) when compared with that of Zn coatings (Ra = 798 nm, Rq = 684 nm). Besides, the inert 2D-CNs within the composite coating can act as the corrosion barriers. Therefore, the Zn-Mn/2D-CNs composite coating has excellent anti-corrosion performance, owning the lowest corrosion current densities icorr (9.2 μA cm−2) and maximum coating resistance Rcoat (1.2 kΩ·cm−2) and charge transfer resistance Rct (3.5 kΩ·cm−2), associated with its modified microstructure, Mn element with passivation property, and 2D-CNs barriers. These results demonstrate the desirable potentiality of inert 2D carbon materials in the electrodeposition of Zn-based coating for improving the corrosion resistance.

Anti-corrosion Properties of Functionalized Organo-silane Coupling Agents for Galvanized Steel

Silane precursor selection is an important criterion for achieving great anticorrosive performance on steel substrates using sol-gel technology. A density functional theory (DFT) study was performed on functional and nonfunctional organosilane precursors. The global reactivity parameters, such as the global hardness (ƞ), dipole moment (μ), and number of electrons transferred (∆N) to the metal substrate, were calculated to identify suitable silane coupling agents. DFT studies revealed that precursors containing functional groups such as epoxy, amine, and mercapto offer better protection against corrosion to galvanized steel by providing stronger interfacial adhesion than precursors without functional moieties. The DFT-calculated adsorption energy (Eads) is more than 40.0kcal/mol for the adsorption of functional organosilanes onto the (ZnO)12 cluster. Evidence of chemical bond formation at the interface for functional organosilanes is found in the electron density overlap in the MOs. Natural charge analyses revealed clear charge transfer from the organosilane moiety to the (ZnO)12 cluster. The theoretical predictions were validated via experiments. Electrochemical studies demonstrated a protective efficiency of 92.5% for Ie with an impedance of 92.9kΩ·cm2. The presence of the respective functional groups and surface morphology were evaluated by FTIR and SEM. The order of corrosion inhibition of organosilanes was found to be MPTMS≈APTES>GPTMS>TEOS.

Construction of a Carbon Monoxide-Releasing Bioactive Hydrogel Coating on the Magnesium Alloy Surface for Better Corrosion Resistance, Anticoagulant Properties, and Endothelial Cell Growth

In this study, we first fabricated a crosslinked hydrogel coating by polymerizing methacryloyloxyethyl sulfonyl betaine and acrylamide (SBMA) on the magnesium (Mg) alloy surface employing ultraviolet (UV) polymerization. Bivalirudin and CO-releasing molecules (CORM-401) were further grafted onto the hydrogel coating surface to acquire a multifunctional biocompatible coating capable of releasing CO to augment corrosion-resisting properties and biocompatibility. The findings verified that the bioactive hydrogel coating significantly increased the corrosion potential and reduced the corrosion current, thereby improving the anticorrosion performance. Meanwhile, owing to the excellent hydrophilicity, the antifouling performance of the hydrogel coating, and the excellent anticoagulant performance of bivalirudin, the hydrogel coating significantly reduced the fibrinogen adsorption, platelet adhesion and activation, and hemolysis occurrence, displaying excellent ability to inhibit blood clotting. Moreover, endothelial cell (EC) experimental results demonstrated that the hydrogel coating could significantly promote EC growth, displaying great potential to induce re-endothelialization after implantation. Specifically, in the presence of cysteine capable of catalyzing CO release, the anticoagulant performance and ability to promote EC growth were further improved significantly. Therefore, the study offers an effective strategy to prepare a hydrogel coating capable of releasing CO to improve the corrosion-resisting performance and biocompatibility of Mg alloys, which is anticipated to be applied in the surface modification of Mg alloy intravascular stents.

Monitoring the anticorrosion performance of developed epoxy-based paint formulations on metallic surfaces by electrochemical impedance spectroscopy

Purpose This study aims to investigate the impact of varying solid ratios in epoxy-based formulations on their corrosion resistance. The amounts of epoxy resin in the formulations were kept constant, and the behavior of paints with varying filler ratios was compared. It also examines the tensiometric and rheological properties of these formulations. Design/methodology/approach Three distinct epoxy-based formulations cured with amine compounds were prepared. The formulations underwent various testing protocols to evaluate their performance: coating tests: coated panels with cross lines were exposed to humidity and corrosive atmospheres. Tensiometric Measurements: Conducted using pendant and sessile drop methods. Rheological characterizations: ıncluded flow tests, oscillatory amplitude sweeps and three-interval thixotropy tests. Corrosion resistance assessment: after the panels were immersed in methanol for one week, measurements were taken using electrochemical impedance spectroscopy. Additional tests: neutral salt spray (NSS) and humidity testing. Findings The study observed that the coated panels, after exposure to NSS and humidity testing, demonstrated corrosion resistance within acceptable limits as defined by the ISO 12944-6 standard. Results indicate that the epoxy-based formulations show potential for improvements in paints and coatings, suggesting promising advancements in their anticorrosion performance. Originality/value This research provides insights into how the solid ratios in epoxy-based formulations influence their performance, particularly in terms of corrosion resistance, tensiometric and rheological properties. The findings contribute to the development of more effective epoxy resin-based coatings for industrial applications.

Architecture of nano-lamellar structure in Fe-B alloys via laser remelting treatment to achieve simultaneous strength-ductility enhancement

Fe-B alloys are of interest due to their promising anticorrosion performance in Al melt, but new forms that are also ductile are needed for their widespread use. The challenge in developing Fe-B alloys that are both corrosion-resistant and ductile lies in the intrinsic tradeoff between B concentration and brittle-to-ductile transition temperature. Here, we show a new strategy for the achievement of room temperature ductility in Fe-B alloys by architecting nano-lamellar structure under the laser remelting treatment. The test results indicate that the microhardness, yield strength and tensile strength of the nano-lamellae structural remelting layer are as high as 877 HV0.2, 1012 MPa and 1123 MPa, respectively, and the uniform elongation is also enhanced to 4.51 % simultaneously. This work paves a new avenue for simultaneously improving the strength and ductility of eutectic alloys with brittle phase and widens the application scope for Fe-B alloys (B≥3.0 wt percentage, wt%).

A novel corrosion inhibitor for copper in sulfuric acid media: Complexation of iodide ions with Benincasa Hispida leaf extract

In the context of green and low-carbon development, the rapid development of industry brings the problem of metal corrosion costs increase, metal corrosion protection methods are of great concern. Extracts from Benincasa hispida leaves (BHLE), which were obtained through pressurised liquid extraction, were employed as a inhibitor for copper corrosion in 0.5 M H2SO4. Their composition and anti-corrosion properties were subsequently analyzed and evaluated. The electrochemical analysis results indicated that BHLE functions as a cathodic-type corrosion inhibitor. The anti-corrosion performance intensifies with the increase in concentration but diminishes gradually as the temperature rises, when the concentration of BHLE is 400 mg/L, the corrosion inhibition efficiency can reach 91.82 %, when the concentration of added potassium iodide reaches 16 mg/L the slow-release efficiency of the compounded corrosion inhibitor reaches 96.92 %. The addition of I− strengthens the inhibition efficiency through the adsorption form dominated by competitive adsorption. The adsorption of BHLE onto the surface of copper follows the Langmuir monolayer adsorption model.