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1、山東大學碩士學位論文ABSTRACTItiswellknownthatthequalityofaluminumalloyshasmuchtodowiththehydrogencontentinthealloys.The叮dehydrogenationofaluminumalloysisthenhighimportancetostudy.Inthisthesis,aseriesofexperimentshavebeenmadetostudytherelationbetweenhydrogenandaluminummelts.Theoreticala
2、nalysisbasedontheseexperimentshasbeenalsogivenhereinorderthatamacroscopicrelationbetweenhydrogenandaluminummeltscanberevealed,andthatagoodfoundationcanbelaidforfurtherstudyofdehydrogenationtechnology.Quantitativecorrelationsofhydrogencontentwithmeltingtemperature,meltingtime,
3、impuritiesandtheenvironmentalhumidityhavebeeninvestigated.SomeexperimentalmethodslikedehydrogenationtechnologyunderavacuumcircumstanceandthecombineddehydrogenationtechnologyofgaseousnitrogentogetherwithSDJ一1fluxhavebeenexclusivelydiscussed.Theexperimentsindicatethathydrogenco
4、ntentinthealuminummeltswillincreaseastemperatureincreasesandtheincrementwillnotbesohigh.Theimpuritieswillhoweverdecreaseastemperatureincreases.Thecontentofhydrogeninmeltswillincreasewhenthemeltingtimeisprolonged.Inspectionontherelationbetweenimpuritiesandhydrogencontentinmelt
5、sdeducesthatmostofhydrogenentersthemeltsbywayofimpurities.Ahighimpuritycontentcorrespondsalwaystoahighhydrogencontentinmoltenaluminumalloys.Itisalsofoundintheexperimentsthathigherhumidityandoverheatingwillincreasethecontentofhydrogen,山東大學碩士學位論文especiallytheinfluenceofhumidity
6、.Uponthisfact,meltingaluminumalloysinvacuumisstudied.Withvacuityincreasing,thecontentofhydrogeninaluminummeltswilldecreaseanditwillreachafairlylowlevel.Similarly,nitrogenandSDJ一1fluxcanalsoreducethecontentofhydrogeninaluminummeltsandobtainasatisfactoryeffectofdehydrogenation.
7、Thediffusionofhydrogenandoxidescomprisesalsoanimportantpartofthispaper.Thedehydrogenationprocessisalsoexploredfromatheoreticalview.Aprincipleoftheseparatingspeedofdehydrogenationisgiven.Throughexperimentalandtheoreticalanalysis,amacroscopicconceptisproposedhere,i.e.parameterR
8、for`HydrogenResistance'，whichgivesagooddescriptionofmacroscopicmovem
