Inadditiontothemechanizationandautomationofproduction,thetechnologicalprogressofaluminumelectrolyticcapacitorsismainlycomposedoftwoprocesses:corrosionphaseactivation.Thecorrosioncoefficientofaluminumfoilisveryhigh(100forlowvoltagecapacitorfoiland25forhighvoltage),andthealuminumfoilwithdifferentholemorphologycanbecorrodedaccordingtotheperformancerequirementofcapacitor.Corrosionprocessisakindofdynamicbalanceprocessofcorrosionsolutiontype,concentration,temperature,composition,structure,surfacestate,foilspeed,powersourcetype,w***eform,frequency,voltageandsoon.Thequestionishowtogetthebestdynamicbalanceandhowtodeterminethemosttran***issibleequilibriumaccordingtotherequirement.Therefore,thecorrosionprocesscannotbesaidtoh***ereachedthebeststate.Theexistingenablingprocesshasbeenabletoproducehigh-qualitydielectricoxidefilms,anddifferentdielectricoxidefilmscanbemadeaccordingtodifferentrequirements,forexample,forDCcapacitors,γandγ'-typecrystallinealuminafilmscanbemade.ForACcapacitors,theyareamorphousfilms.Thegreatestdevelopmentofthetechnologyisthatthealuminumhydroxidefilmcanbetransformedintothedielectricaluminafilmandthewaterprooflayercanbeformedonthesurfaceofthealuminumhydroxidefilm.Inaddition,itcaneliminatethedefectsandcracksofthedielectricfilm.)