Corrosion resistance of multilayer hybrid sol-gel coatings deposited on the AISI 316L austenitic stainless steel

摘要

Inthepresentworkmultilayerhybridsol-gelcoatingsweresynthesizedontheAISI316Lausteniticstainlesssteelemployedinthefabricationoforthopaedicimplants.Hybridsolswereobtainedfromamixtureofinorganicprecursor,TEOS,andorganic,GPTMS,usingethanolassolvent,andaceticacidascatalyst.ThecharacterizationofthesolswasperformedusingpHmeasurements,rheologicaltestsandinfraredspectroscopy(FTIR)fordifferentageingtimes.Ontheotherhand,thecoatingswerecharacterizedbyscanningelectronmicroscopy(SEM),whilethecorrosionresistancewasevaluatedusinganodicpotentiodynamicpolarizationinSBFsolutionat37±2°C.Theresultsconfirmedthatsol-gelsynthesisemployingTEOS-GPTMSsystemsproducesuniformandhomogeneouscoatings,whichenhancedthecorrosionresistancewithregardtotheparentalloy.Moreover,corrosionperformancewasretainedafterapplyingmorethanonelayer(multilayercoatings)...