Abstract
MoS2 has been regarded as a promising addition for the preparation of epoxy-based coatings with high anticorrosion ability. However, its dispersion and compatibility remain significant challenges. In the present work, an organic thin layer was well coated on lamellar molybdenum disulfide (MoS2) via a simple modification of 3-aminopropyltriethoxysilane (APTES). The modification of hydrolyzing APTES on lamellar MoS2 effectively improved the dispersity of MoS2 in water-borne epoxy (WEP) and successfully enhanced the compatibility and crosslinking density of MoS2 with WEP. The influence of introducing MoS2-APTES into WEP coating on anticorrosion property for N80 steel was tested by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and salt spray test. The results exhibited that the |Z|0.01Hz value of MoS2-APTES/WEP still reached 3.647 × 107 Ω·cm2 even after the immersion time of 50 days in 3.5 wt.% NaCl solution, showing an extraordinary performance of corrosion resistance. The enhanced anticorrosion performance of composite coating could be resulted from the apparently increased dispersibility and compatibility of MoS2 in WEP.
Highlights
Metal corrosion has become a worldwide problem causing enormous economic losses and many casualties [1,2]
Sepideh et al [27] used (3-aminopropyl) triethoxysilane (APTES)-modified graphene oxide (GO) as a nanofiller to add into the epoxy coating, and the results showed that corrosion protection performance greatly improved because of the excellent interfacial interaction of GO in coating through silane modification
All of the results prove the addition of MoS2-APTES into Waterborne epoxy coating (WEP) coating and can offer carbon steel a long-period anticorrosion protection capacity
Summary
Metal corrosion has become a worldwide problem causing enormous economic losses and many casualties [1,2]. WEP coatings could not attain satisfactory results of protecting metal from corrosion due to the formation of micro-pores or micro-cracks during coating curing caused by solvent evaporation [11] To solve this problem, some methods have been developed to reinforce the anticorrosive capability of the WEP coatings. It is generally acknowledged that organic silane coupling agents could be used to modify materials In this regard, Sepideh et al [27] used (3-aminopropyl) triethoxysilane (APTES)-modified graphene oxide (GO) as a nanofiller to add into the epoxy coating, and the results showed that corrosion protection performance greatly improved because of the excellent interfacial interaction of GO in coating through silane modification. FFaabbrriiccaattiioonn ooff MMooSS22--AAPPTTEESS CCoommppoossiittee CCooaattiinngg AauAnlPPtdrTTauEEFsFloSSiitrrnrssssaiuttucsllsayysopp,t,neeaeaidcnnccassefetiioreoortrdtnnaai5ifwnwnormaaaamss5minaamododutiuddonnneettdtdooobofiiontnfMabttMiootnoaSwowina2Saa(2at0htee.(oh3rr0mbob.w3omoortrwg.onn%egeetn.)e%eeenwppo)eoaouowsxxsuyyadsssirrosseedoplsuslieiiustnnriptsoiceeconoodrn.snn.eiSttndSaauiuipbnnibunsiinsenrepeqggquuwcuceruuaeenrrtntiewiltnnyrlg,ayg,,staetatthihgrgr,eeeresennMMtdttiraoaoarnSennSdd22dd-mmeecchhaanniiccaallllyy ssttiirrrriinngg ffoorr 1100 mmiinn ttoo pprroodduuccee aa hhoommooggeenneeoouuss mmiixxttuurree. TThhee aavveerraaggee tthhiicckknneessss ooff tthheeccooaattiinnggwwaassmmeaesausruerdedbybtyhethceoactoiantginthgicthkinceksnsegsasuggaeu(gQeN(QIXN4I5X004,5Q0n0,ixQ, Bnoixn,nB, oGnenr-, Gmearnmya),nwy)h,iwchhwichaswaabsoaubto4u0t.040±.05 ±μm5.μSmim. iSlaimrlyil,aTrlhy,eTWheEPWaEnPdaMndoSM2/oWS2E/PWwEePrewaelsroe aplrseoppraerpedarvediavtihaetshaemsaemmeemtheotdh.od
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