Abstract: Ethylene chlorotrifluoroethylene (ECTFE) coating was applied to the surface of carbon steel through electrostatic spraying and low-temperature heat treatment. The morphology and structure of the coating were analyzed using various characterization techniques. The electrochemical data of the coated steel soaked in 3.5% (mass fraction) NaCl solution for 90 d at different periods were also examined. The findings indicate that the outer surface of the coating remains structurally stable before and after soaking. F can diffuse into the steel substrate, facilitating the bonding between the coating and the steel substrate, but the free F also induces a weakening effect on the crystalline structure. Due to the thickness of the coating edge and the susceptibility to infiltration of the corrosive medium, under-film micro-zone corrosion occurs at a slow rate. After soaking for 90 d, the impedance modulus measures approximately 10⁴ Ω·cm², and the open circuit potential (OCP) is -0.61 V. The self-corrosion current density is 1.13×10^-6 A/cm², resulting in a calculated coating protection rate of 99.29%. In summary, despite edge corrosion occurring, the ECTFE coating provides excellent corrosion protection.

ECTFE涂层对碳钢的腐蚀行为及防腐机制研究

[1]Abdel-HadyEE, El-ToonyMM, 2015. Grafting of vinyl pyrrolidone/styrene onto ethylene/chlorotrifluoroethylene membrane for proton exchange membrane fuel cell. Electrochimica Acta, 176:472-479.

[2]AlibakhshiE, AkbarianM, RamezanzadehM, et al., 2018. Evaluation of the corrosion protection performance of mild steel coated with hybrid sol-gel silane coating in 3.5 wt.% NaCl solution. Progress in Organic Coatings, 123:190-200.

[3]CaiGY, XiaoS, DengCM, et al., 2021. CeO₂ grafted carbon nanotube via polydopamine wrapping to enhance corrosion barrier of polyurethane coating. Corrosion Science, 178:109014.

[4]ChangXT, ChenXQ, ZhangQY, et al., 2021. Alumina nanoparticles-reinforced graphene-containing waterborne polyurethane coating for enhancing corrosion and wear resistance. Corrosion Communications, 4:1-11.

[5]CuiZL, DrioliE, LeeYM, 2014. Recent progress in fluoropolymers for membranes. Progress in Polymer Science, 39(1):164-198.

[6]DoucheD, ElmsellemH, AnouarEH, et al., 2020. Anti-corrosion performance of 8-hydroxyquinoline derivatives for mild steel in acidic medium: gravimetric, electrochemical, DFT and molecular dynamics simulation investigations. Journal of Molecular Liquids, 308:113042.

[7]GhanbariA, Bordbar-KhiabaniA, WarchomickaF, et al., 2023. PEO/polymer hybrid coatings on magnesium alloy to improve biodegradation and biocompatibility properties. Surfaces and Interfaces, 36:102495.

[8]GiannettiE, 2005. Thermal stability and bond dissociation energy of fluorinated polymers: a critical evaluation. Journal of Fluorine Chemistry, 126(4):623-630.

[9]HaeriZ, RamezanzadehB, RamezanzadehM, 2022. Recent progress on the metal-organic frameworks decorated graphene oxide (MOFs-GO) nano-building application for epoxy coating mechanical-thermal/flame-retardant and anti-corrosion features improvement. Progress in Organic Coatings, 163:106645.

[10]HsissouR, BenzidiaB, HajjajiN, et al., 2018. Elaboration and electrochemical studies of the coating behavior of a new nanofunctional epoxy polymer on E24 steel in 3.5% NaCl. Portugaliae Electrochimica Acta, 36(4):259-270.

[11]HsissouR, BenhibaF, EchihiS, et al., 2021. Performance of curing epoxy resin as potential anticorrosive coating for carbon steel in 3.5% NaCl medium: combining experimental and computational approaches. Chemical Physics Letters, 783:139081.

[12]HsissouR, AzogaghM, BenhibaF, et al., 2022a. Insight of development of two cured epoxy polymer composite coatings as highly protective efficiency for carbon steel in sodium chloride solution: DFT, RDF, FFV and MD approaches. Journal of Molecular Liquids, 360:119406.

[13]HsissouR, BenhibaF, El AboubiM, et al., 2022b. Synthesis and performance of two ecofriendly epoxy resins as a highly efficient corrosion inhibition for carbon steel in 1 M HCl solution: DFT, RDF, FFV and MD approaches. Chemical Physics Letters, 806:139995.

[14]Huttunen-SaarivirtaE, YudinVE, MyagkovaLA, et al., 2011. Corrosion protection of galvanized steel by polyimide coatings: EIS and SEM investigations. Progress in Organic Coatings, 72(3):269-278.

[15]KajánekD, HadzimaB, BuhagiarJ, et al., 2019. Corrosion degradation of AZ31 magnesium alloy coated by plasma electrolytic oxidation. Transportation Research Procedia, 40:51-58.

[16]LeiHB, HeDL, GuoYN, et al., 2018. Synthesis and characterization of UV-absorbing fluorine-silicone acrylic resin polymer. Applied Surface Science, 442:71-77.

[17]LiuCB, QianB, HouPM, et al., 2021. Stimulus responsive zeolitic imidazolate framework to achieve corrosion sensing and active protecting in polymeric coatings. ACS Applied Materials & Interfaces, 13(3):4429-4441. https://dx.doi.org/10.1021/acsami.0c22642

[18]LiuG, PanJ, XuXL, et al., 2020. Preparation of ECTFE porous membrane with a green diluent TOTM and performance in VMD process. Journal of Membrane Science, 612:118375.

[19]MOHURD (Ministry of Housing and Urban-Rural Development of the People’s Republic of China), 2009. Corrosion of Metals and Alloys-Electrochemical Test Methods–Guidelines for Conducting Potentiostatic and Potentiodynamic Polarization Measurements, GB/T 24196–2009. National Standards of the People’s Republic of China(in Chinese).

[20]MOHURD (Ministry of Housing and Urban-Rural Development of the People’s Republic of China), 2021. Paints and Varnishes–Cross-Cut Test, GB/T 9286–2021. National Standards of the People’s Republic of China(in Chinese).

[21]MolhiA, HsissouR, DamejM, et al., 2021. Contribution to the corrosion inhibition of C38 steel in 1 M hydrochloric acid medium by a new epoxy resin PGEPPP. International Journal of Corrosion and Scale Inhibition, 10(1):399-418.

[22]PanJ, MaWY, HuangLL, et al., 2021. Fabrication and characterization of ECTFE hollow fiber membranes via low-temperature thermally induced phase separation (L-TIPS). Journal of Membrane Science, 634:119429.

[23]RudnevVS, Vaganov-VilkinsAA, YarovayaTP, et al., 2016. Polytetrafluoroethylene-oxide coatings on aluminum alloys. Surface and Coatings Technology, 307:1249-1254.

[24]SenguptaS, MurmuM, MandalS, et al., 2021. Competitive corrosion inhibition performance of alkyl/acyl substituted 2‍-‍(2-hydroxybenzylideneamino) phenol protecting mild steel used in adverse acidic medium: a dual approach analysis using FMOs/molecular dynamics simulation corroborated experimental findings. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 617:126314.

[25]ShenGZ, ZhangLY, WuW, et al., 2022. Design and fabrication of enhanced corrosion-resistant LDH-Zn-G/Ni dual-layer structural coatings on magnesium alloys. Journal of Alloys and Compounds, 917:165475.

[26]SimoneS, FigoliA, SantoroS, et al., 2012. Preparation and characterization of ECTFE solvent resistant membranes and their application in pervaporation of toluene/water mixtures. Separation and Purification Technology, 90:147-161.

[27]SinghL, DevganK, SamraKS, 2012. Effect of swift heavy ion irradiation on ethylene–chlorotrifluoroethylene copolymer. Radiation Physics and Chemistry, 81(11):1741-1746.

[28]SteffiAP, BalajiR, ChenSM, et al., 2021. Rational construction of SiO₂/MoS₂/TiO₂ composite nanostructures for anti-biofouling and anti-corrosion applications. ChemistrySelect, 6(5):917-927.

[29]SteffiAP, BalajiR, ChandrasekarN, et al., 2022a. High-performance anti-corrosive coatings based on rGO-SiO₂-TiO₂ ternary heterojunction nanocomposites for superior protection for mild steel specimens. Diamond and Related Materials, 125:108968.

[30]SteffiAP, BalajiR, PrakashN, et al., 2022b. Incorporation of SiO₂ functionalized gC₃N₄ sheets with TiO₂ nanoparticles to enhance the anticorrosion performance of metal specimens in aggressive Cl^- environment. Chemosphere, 290:133332.

[31]WanS, ChenHK, MaXZ, et al., 2021. Anticorrosive reinforcement of waterborne epoxy coating on Q235 steel using NZ/BNNS nanocomposites. Progress in Organic Coatings, 159:106410.

[32]WangH, XuJH, DuXS, et al., 2021. A self-healing polyurethane-based composite coating with high strength and anti-corrosion properties for metal protection. Composites Part B: Engineering, 225:109273.

[33]WangHH, DuanYH, MaXT, et al., 2021. Polyisocyanate bridged environmental graphene/epoxy nanocomposite coatings with excellent anticorrosion performance. Progress in Organic Coatings, 153:106167.

[34]WangKL, HongS, WeiZ, et al., 2021. Long-term corrosion behavior of HVOF sprayed Cr₃C₂-NiCr coatings in sulfide-containing 3.5 wt.% NaCl solution. Journal of Materials Research and Technology, 15:3122-3132.

[35]XiangYX, HeY, TangWW, et al., 2021. Fabrication of robust Ni-based TiO₂ composite@TTOS superhydrophobic coating for wear resistance and anti-corrosion. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 629:127394.

[36]XuLY, FuXJ, SuHJ, et al., 2022. Corrosion and tribocorrosion protection of AZ31B Mg alloy by a hydrothermally treated PEO/chitosan composite coating. Progress in Organic Coatings, 170:107002.

[37]YanST, TangP, LingZW, et al., 2022. An analytical investigation of the collapse of asymmetrically corroded pipes under external pressure. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 23(5):358-374.

[38]YangSH, FangH, LiH, et al., 2022. Synthesis of tung oil-based vinyl ester resin and its application for anti-corrosion coatings. Progress in Organic Coatings, 170:106967.

[39]YaoN, ChauJ, EleleE, et al., 2017. Characterization of microporous ECTFE membrane after exposure to different liquid media and radiation. Journal of Membrane Science, 532:89-104.

[40]ZavarehMA, SarhanAADM, ZavarehPA, et al., 2016. Electrochemical corrosion behavior of carbon steel pipes coated with a protective ceramic layer using plasma and HVOF thermal spray techniques for oil and gas. Ceramics International, 42(2):3397-3406.

[41]ZhangWY, ZhangT, ZhuZX, et al., 2022. Corrosion electrochemistry properties of thermally sprayed Zn-Cu-Ti coating in simulated ocean atmosphere. Journal of Materials Research and Technology, 21:3235-3247.

[42]ZhangZQ, LiYL, ZhuXY, et al., 2021. Meso-scale corrosion expansion cracking of ribbed reinforced concrete based on a 3D random aggregate model. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 22(11):924-940.

[43]ZhaoHR, DingJH, LiuPL, et al., 2021. Boron nitride-epoxy inverse “nacre-like” nanocomposite coatings with superior anticorrosion performance. Corrosion Science, 183:109333.