Corrosion fatigue behavior of epoxy-coated Mg-3Al-1Zn alloy in NaCl solution

(整期优先)网络出版时间:2014-03-13
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Thecorrosionfatiguebehaviorofepoxy-coatedMg–3Al–1Znalloywasinvestigatedinairand3.5wt%NaClsolution.Epoxycoatingasanewmethodwasusedtoimprovethecorrosionfatiguepropertyofthematerial.Resultsshowthatthefatiguelimit(FL)ofthecoatedspecimensishigherthanthatoftheuncoatedspecimensin3.5wt%NaClsolutionbecauseofthestrengtheningandblockingfunctionsoftheepoxycoating.TheFLofthecoatedspecimensin3.5wt%NaClsolutionisashighasthatinair.Itimpliesthatthecoatedspecimensarenotassensitivetotheenvironmentasthemagnesiumalloy.Thelowtensilestrengthandtheshortelongationofthepureepoxycoatingleadtothatthefatiguecrackofthecoatedspecimenisalwaysinitiatedfromtheepoxy-coatingfilmPoresandpinholesacceleratethefatiguecrackinitiationprocess.PinholesarecausedbythecorrosionreactionsbetweentheepoxycoatingandtheNaClsolution.