Conductive polyaniline (PANI) particles were synthesized by chemical oxidation polymerization using hydrochloric acid as dopant, ammonium persulfate as oxidant and imidazole ionic liquid as stabilizer. Polyaniline waterborne epoxy anticorrosive coating was prepared by dispersing as-prepared polyaniline into waterborne epoxy resin (ER). And the effects of polyaniline particles on the corrosion resistance and mechanical properties of the coating were studied. Electrochemical impedance spectroscopy (EIS) results of the coating showed that the addition of polyaniline significantly improved the barrier properties of the aqueous epoxy coating. The impedance (|Z|f=0.01Hz) of all PANI/ER coatings were higher than pure ER coating. ER coating had the best barrier performance when adding 5.0wt% PANI, the |Z|f=0.01Hz value during 0~168 h immersion was stable at around 8.0?108 Ω?cm2 and after immersion for 168 h was 7.5?108 Ω?cm2, which was much higher than ER and other PANI/ER systems. The neutral salt spray test showed that the addition of polyaniline imparted the coating of the ability to passivate corrosion, significantly improving the corrosion resistance of the coating. The higher the PANI amount, the better the corrosion resistance. The bending and impact tests showed that the mechanical properties of the coating increased first and then decreased with the increase of polyaniline content. When the addition amount of polyaniline did not exceed 5.0wt%, the mechanical properties of the coating were excellent and the adhesion and toughness were both very good. When the PANI addition amount increased to 7.0wt%, the brittleness of the ER coating was remarkably strong, and the mechanical properties were degraded. The optimum addition amount of polyaniline in the aqueous epoxy system was 5.0wt%. Under this condition, the mechanical properties of the coating were good and the comprehensive anticorrosion performance was optimal.
You FENG Jingkun ZHANG Yang XUE Haosheng WANG Donghai ZHANG Yunfa CHEN
. Effect of polyaniline particles on corrosion resistance of waterborne epoxy resin coatings[J]. The Chinese Journal of Process Engineering, 2019
, 19(2)
: 419
-426
.
DOI: 10.12034/j.issn.1009-606X.218237
[1] Kendig M, Mills D J.An historical perspective on the corrosion protection by paints [J]. Progress in Organic Coatings, 2017, 102: 53-59.[J].Progress in Organic Coatings, 2017, 102(part A):53-59 [2]Wang G, Yang J.Influences of glass flakes on fire protection and water resistance of waterborne intumescent fire resistive coating for steel structure[J].Progress in Organic Coatings, 2011, 70(2-3):150-156 [3] Lyon S B, Bingham R, Mills D J.Advances in corrosion protection by organic coatings: What we know and what we would like to know [J]. Progress in Organic Coatings, 2017, 102: 2-7.[J].Progress in Organic Coatings,, 2017, 102(part A):2-7 [4]Packham D E.Adhesive technology and sustainability[J].International Journal of Adhesion and Adhesives, 2009, 29(3):248-252 [5] Liu M, Mao X, Zhu H, et al.Water and corrosion resistance of epoxy–acrylic–amine waterborne coatings: Effects of resin molecular weight, polar group and hydrophobic segment [J]. Corrosion Science, 2013, 75: 106-113.[J].Corrosion Science, 2013, 75(-):106-113 [6] Francisco J S, Capelossi V R, Aoki I V.Evaluation of a sulfursilane anticorrosive pretreatment on galvannealed steel compared to phosphate under a waterborne epoxy coating [J]. Electrochimica Acta, 2014, 124: 128-136.[J].Electrochimica Acta, 2014, 124(-):128-136 [7]DeBerry D W.Modification of the electrochemical and corrosion behavior of stainless steels with an electroactive coating[J].Journal of the Electrochemical society, 1985, 132(5):1022-1026 [8]Wessling B.Corrosion prevention with an organic metal (polyaniline): surface ennobling,passivation,corrosion test results[J].Materials and Corrosion, 1996, 47(8):439-445 [9] 李志涛.聚2, 3-二甲基苯胺及其无机纳米复合物的制备及防腐性能研究 [D].重庆大学, 2014. [10]Li Z T.Preparation and Anticorrosive properties of Poly(2, 3-dimethylaniline) and its Composites with nano Inorganic Particles [D]. Chongqing University, 2014. [11]Chen Y, Wang X H, Li J, et al.Long-term anticorrosion behaviour of polyaniline on mild steel[J].Corrosion science, 2007, 49(7):3052-3063 [12]Sathiyanarayanan S, Muthkrishnan S, Venkatachari G.Corrosion protection of steel by polyaniline blended coating[J].Electrochimica Acta, 2006, 51(28):6313-6319 [13]Fahlman M, Jasty S, Epstein A J.Corrosion protection of ironsteel by emeraldine base polyaniline: an X-ray photoelectron spectroscopy study[J].Synthetic Metals, 1997, 85(1-3):1323-1326 [14]Cook A, Gabriel A, Siew D, et al.Corrosion protection of low carbon steel with polyaniline: passivation or inhibition[J].Current Applied Physics, 2004, 4(2-4):133-136 [15]Schauer T, Joos A, Dulog L, et al.Protection of iron against corrosion with polyaniline primers[J].Progress in Organic Coatings, 1998, 33(1):20-27 [16] 肖书虎.聚苯胺对铁基金属的伽伐尼阳极保护效应 [D].武汉大学, 2005. [17]Xiao S H.The Effect of Polyaniline to Galvanic Anodic Protection on Ferrous Metals [D]. Wuhan University, 2005. [18] 赵贺.导电高分子材料对金属防腐作用的研究 [D].天津工业大学, 2017. [19]Zhao H.Anticorrosion Effect of Conductive Polymer Materials on Metals [D].Tianjin Polytechnic University, 2017.
