磷化聚苯胺用量对复合涂层防腐蚀性能的影响
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摘要
以植酸(Ph A)为掺杂剂,通过化学氧化法合成了一种磷化聚苯胺(P-PANI),并将其混入硅树脂(SiR)中,刷涂在镁锂(Mg-Li)合金表面制备了P-PANI/SiR复合防腐蚀涂层。采用FTIR、UV-Vis-NIR和XPS表征了P-PANI的结构;考察了P-PANI含量对复合涂层疏水性、附着力及防腐蚀性能的影响。结果表明:当P-PANI占SiR的质量分数为2.0%时,得到的复合涂层表现出较好的疏水性和防腐蚀性能。其水接触角为125.4?,复合涂层的干、湿附着力均为0级,腐蚀电流密度为5.15×10–10 A/cm~2,电化学阻抗值达到6.5×109?·cm~2。
Phosphorized polyaniline(P-PANI) was synthesized by chemical oxide method with phytic acid(Ph A) as dopant,followed by mixed with silicon resin(SiR),and then coated on the surface of magnesiumlithium(Mg-Li) alloy to prepare P-PANI/SiR composite anticorrosion coatings. The structure of P-PANI was characterized by Fourier transform infrared spectroscopy(FTIR),ultraviolet-visible-near infrared spectroscopy(UV-Vis-NIR),and X-ray photoelectron spectroscopy(XPS). The effects of P-PANI content in composite coatings on the hydrophobicity,adhesion and anticorrosion properties of composite coatings were investigated. The results showed that the composite coating containing 2.0% P-PANI(based on the mass of SiR) had better hydrophobic property and anticorrosion performance. The water contact angle(CA) of the coating was 125.4?,the dry and wet adhesions of P-PANI/SiR composite coating were grade 0. The corrosion current density was 5.15×10–10 A/cm~2,and the electrochemical impedance value could reach 6.5×109 ?·cm~2.
Phosphorized polyaniline(P-PANI) was synthesized by chemical oxide method with phytic acid(Ph A) as dopant,followed by mixed with silicon resin(SiR),and then coated on the surface of magnesiumlithium(Mg-Li) alloy to prepare P-PANI/SiR composite anticorrosion coatings. The structure of P-PANI was characterized by Fourier transform infrared spectroscopy(FTIR),ultraviolet-visible-near infrared spectroscopy(UV-Vis-NIR),and X-ray photoelectron spectroscopy(XPS). The effects of P-PANI content in composite coatings on the hydrophobicity,adhesion and anticorrosion properties of composite coatings were investigated. The results showed that the composite coating containing 2.0% P-PANI(based on the mass of SiR) had better hydrophobic property and anticorrosion performance. The water contact angle(CA) of the coating was 125.4?,the dry and wet adhesions of P-PANI/SiR composite coating were grade 0. The corrosion current density was 5.15×10–10 A/cm~2,and the electrochemical impedance value could reach 6.5×109 ?·cm~2.
引文
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[3]Hao J J(郝建军),Li X(李新),Wang H(王昊).Effect of Zn2+doping on corrosion resistance of poiyaniline film prepared by electrochemical synthesis[J].Acta Materiae Compositae Sinica(复合材料学报),2014,31(4):1117-1120.
[4]Siva T,Kamaraj K,Sathiyanarayanan S.Epoxy curing by polyaniline(PANI)–Characterization and self-healing evaluation[J].Progress in Organic Coatings,2014,77(6):1095-1103.
[5]Yang X G(杨小刚),Wang L(王莉),Jin S Y(金思毅),et al.Synthesis and properties of polyaniline nanofibers secondary doped with phosphoric acid[J].Journal of Chemical Engineering of Chinese Universities(高校化学工程学报),2015,29(3):664-670.
[6]Perrin F X,Phan T A,Nguyen D L.Preparation and characterization of polyaniline in reversed micelles of decylphosphonic acid for active corrosion protection coatings[J].European Polymer Journal,2015,66:253-265.
[7]Gao Y Z,Syed J A,Lu H B,et al.Anti-corrosive performance of electropolymerized phosphomolybdic acid doped PANI coating on304SS[J].Applied Surface Science,2016,360:389-397.
[8]Hernandez-alvarado L A,Hernandez L S,LomelíM A,et al.Phytic acid coating on Mg-based materials for biodegradable temporary endoprosthetic applications[J].Journal of Alloys and Compounds,2016,664:609-618.
[9]Zhou Y,Ding C Y,Qian X R,et al.Further improvement of flame retardancy of polyaniline-deposited paper composite through using phytic acid as dopant or co-dopant[J].Carbohydrate Polymers,2015,115:670-676.
[10]Santos L H E,Branco J S C,Guimar?es I S,et al.Synthesis in phytic acid medium and application as anticorrosive coatings of polyaniline-based materials[J].Surface&Coatings Technology,2015,275:26-31.
[11]National Technical Committee on Paints&Pigments of Standardization Administration of China.GB/T 9286-1998 Paints and varnishes—Cross cut test for films[S].Beijing:Standards Press of China,1998(in Chinese).
[12]Sheng X X,Cai W X,Zhong L,et al.Synthesis of functionalized graphene/polyaniline nanocomposites with effective synergistic reinforcement on anticorrosion[J].Industrial&Engineering Chemistry Research,2016,55:8576-8585.
[13]Yan B,Chen Z H,Cai L,et al.Fabrication of polyaniline hydrogel:Synthesis,characterization and adsorption of methylene blue[J].Applied Surface Science,2015,356:39-47.
[14]Mousavinejad T,Bagherzadeh M R,Akbarinezhad E,et al.A novel water-based epoxy coating using self-doped polyaniline-clay synthesized under supercritical CO2 condition for the protection of carbon steel against corrosion[J].Progress in Organic Coatings,2015,79:90-97.
[15]Qiu B,Xu C X,Sun D Z,et al.Polyaniline coating with various substrates for hexavalent chromium removal[J].Applied Surface Science,2015,334:7-14.
[16]Chen S N(陈山南).Factors influencing adhesion of coatings[J].Paint&Coating Industry(涂料工业),1983,13(1):21-25.
[17]Li Y F,Zhu J J,Gao X H.Preparation and properties of waterborne polyaniline/versatate-fluoro-acrylate composite anticorrosion coatings[J].Acta Materiae Compositae Sinica,2016,33(9):1859-1867.
[18]Luo Y Z,Sun Y,Lv J L,et al.Transition of interface oxide layer from porous Mg(OH)2 to dense Mg O induced by polyaniline and corrosion resistance of Mg alloy therefrom[J].Applied Surface Science,2015,328:247-254.
[19]Gao H F,Zhang S T,Liu C L,et al.Phytic acid conversion coating on AZ31B magnesium alloy[J].Surface Engineering,2012,28(5):387-392.