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:2004211222;2005203212:(1979-),,,,.Tel:029-83208080E-mail:wangping0402@sina.comN80,,710032:N80,.,,,.,.:;;:TG17219:A:100226495(2006)0320233203ASTATISTICO2ANALYSISFORPITTESTINGDATAOFN80CARBONSTEELWANGPing,MAQunDepartmentofMaterialsandChemicalScience,XianInstituteofTechnology,Xian710032ABSTRACT:AgreatnumberofpitswasinducedonN80steelbyspecialcorrosionconditionandmedi2um.Thedistributionfunctionoftheaveragedensityofthepitsandthedeepestpitsmaybesetupbythestatisticoanalysis.KEYWORDS:pits;statistico2analysis;distributionfunction,.,[1].,.,,,,.,,,,,,,.N80,,,.2211:CO2,;N80;1;:65,1MPa,015m/s,6.212No11No163185cm24,1/4,1/2,N=12,2.Table1CompositionofsolutionforexperimentNaClCaCl2MgCl6H2ONaSO4NaHCO3mol/L011008010016010034010005010141Table2NumbersofpitsanddepthofthedeepestcorrosionpitsampleNo1123456corrosionpitsNo1(k)362829242220depthofthe231722129152716211326deepestpitdm,m20161817291318182415Table3RangeofpittingcorrosionnumbersonsamplesurfacesampleNo1123456pittingcorrosionx247137381239136331753114229106No1inpractice(x)x12716320182116417138151721410718320065CORROSIONSCIENCEANDPROTECTIONTECHNOLOGYVol118No13May12006Table4Rangeofaveragedensityofactivecorrosionspotperm2sampleNo1123456probilityofav2eragedensityofcorrosionactivedot(=011)104(entries/m2) nupperlimit491343917941351163217330127 nlowerlimit2817821167221541811161381416622112:k24,No1456;k24No1123.=011,x= nAs,x2=k+115+uakx1=k+115-uak[2],3.212nx1/Asnx2/As(x2,x1x)As=0196cm2N80,4.213di,Pi=i/(N+1)Pi.Gumbel:ln[ln(1/p)]=-(dm/t)+(tm/t)(1)ln[ln(1/p)]=Y;dm=X,(1)Y=-(X/t)+(tm/t)=bX+a(2):b=-1/t;a=tm/t(3),Y=a+bXab:a=Y-bX=51336;b=6Ni=1(Xi-X)(Yi-Y)6Ni=1(Xi-X)2=-01261a,b(3)(2)(1)t=-1/b=31831(m);tm=-a/b=201444(m).(2)Y=51336-01261X;(1)ln[ln(1/P)]=51336-01261X(4)Gumbel:(1)31831m;(2)201444;(3)dm(di)(5):P(tdm)=exp[-exp(-(dm-201444)/31831)](5)(4)di(5)510,Pi,Pi=i/(N+1)Table5Tableofstatisticanalysisdatarow12345678910N=18XiPiYiXi-X(Xi-X)2(Yi-Y)(Yi-Y)2(Xi-X)YiPiidi(10-2mm)ln[ln(1/Pi)](Yi-Y)1170107901937-513752818911144121076-7174501899010862180115401626-41375191141111311277-419440163801151318180123101382-315751217810188601785-311670142901215419150130801164-21875812660166801446-1192101246012785201601385-01047-11775311510145701209-01811-01041013836211301462-01259-1107511156012450106-01263-01223014497221201538-01478-01175010310102601001-01005-01458015318231701615-017211132511756-0121701047-01288-0185016529241501692-019992112541516-0149501245-11052-1105901707102601769-1133731625131141-0183301694-3102-11450179111271601846-1178851225271301-1128411649-61709-118680185712291301923-2154261925471956-21024108-131989-2131101906626815-610441681087111569-431913averagevalue221375-0150443218Fig.1ProbabilitydistributinofcorrosiondephforN80steelFig.2FiducallimitsoftheresponseslinePi,Gumbeldm,1[3].3311SS2S2=6Ni=1(yi- y)2-b26Ni=1(xi- x)2N-2=01012S=01012=01109312bSb=s6Ni=1(xi- x)2=010084S2bS2,N-2.b:b=b^sbta,=-0126101015b^b;t,t,t.b=-1/t,b:31623t41065(m).313YXXY.bt.b=0,yx;b0,yx.b0,:tb=b^Sbtbt,,.tb=311071t,=1181,yx.314(4)XY,Sy=s[1N+(x- x)26Ni=1(x- x)2]12.2XY,;PiYi.Y’i,.411N80 n20136 n381048(104/m2).21N80dmGumbel.31,.:[1],.[J].,1994,16:97.[2].[M].:,1988.82.[3],.[J].,1996,25(3):20.3:N80
本文标题:N80钢点蚀实验数据的统计分析
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