Degradationbehaviorof Mg-based biomaterials containing diffe(4)
时间：2025-02-23
镁合金,LPSO
Figure5|TheinitiationanddevelopmentofthecorrosionproductsformedontheMDZ-Calloy,(a)afterimmersion10min;(b)30min,(c)60minand(d)120
min.
Cyclicpolarization.Acyclicpolarizationscanprovidesaqualitativeviewofpittingcorrosionmechanismanddeterminesthetrendofundergoingsurfacepittingwhenamaterialisplacedinacorrosivemedium27.ItisparticularlysuitableforMgalloyscontainingLPSOphases,inwhichpittingcorrosionoccursfrequently.ThecyclicpolarizationcurvesoftheMDZ-CandMDZ-545alloysafterdifferenttimeswereshowninFig.7.Thepolarizationcurveswereusedtoestimatethecorrosionpotential(Ecorr),pittingpotential(Epp),andcorrosioncurrentdensity(Icorr)bytheTafel
extrapolationofthecathodicbranches26.Theaveragecorrosionrate(ACR,mmy21)iscalculatedbasedonfollowingequation:
ACR~
IcorrKEw
d
ð1Þ
WhereKisconstantthatdefinestheunitsofthecorrosionrate(,3272mm/A-cm-y).
Ewisequivalentweight(,12g/equivalent).disdensity(,1.7g/cm3
).
Figure6|TheinitiationanddevelopmentofthecorrosionproductsformedontheMDZ-545alloy,(a)afterimmersion10min;(b)30minand(c)60min.
Degradationbehaviorof Mg-based biomaterials containing diffe(4).doc
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