|
|
|
| HOT CORROSION OF NICKEL-BASE CAST SUPERALLOY K35 AT 800℃ |
| Yun LI;Jianting Guo;Chao YUAN;Hongcai YANG;Long FANG;Xuegui LIU |
| 中国科学院金属研究所;沈阳化工学院;东北大学 |
|
|
|
|
Abstract Hot corrosion behavior of nickel-base cast superalloy K35 in the presence of a thin film of 75%Na2SO4+25%NaCl in air at 800℃～900℃ was studied.The results showed that the superalloy was subjected to “high temperature" hot corrosion attack under the experimental condition.The kinetics curve of hot corrosion followed basically the parabolic law.Corroded products can be divided into three layers,which external scales of Cr2O3 formed mainly,
intermediate layer was Ti-rich,internal layer was mainly oxides of Al.For the corrosion process,especially in the steady state,the development of hot corrosion was characterized by the rapid growth of the compact oxide layer and was accompanied by some volatility of Cr2O3，which volatile temperature is decreased by coating the film of salt on the specimens.There are a little sulfides on the surface of the specimens at 800℃ and 850℃.With increasing temperature internal sulfides were formed.The corrosion kinetics and morphology examinations tend to support the sulphidization-basic dissolution model previously proposed for hot corrosion mechanism.
|
|
Received: 15 April 2004
|
|
|
|
Corresponding Authors:
Yun LI
E-mail: liyun@syict.edu.cn
|
[1]KaiW,LeeCH,LeeTW,WuCH.SulfidationbehaviorofInconel738superalloyat500-900℃[J].Oxid.Met.,2001,56(1/2):51
[2]MisraRDK,SivakumarR.EffectofNaClvaporontheoxidation ofNi-Cralloy[J].Oxid.Met.,1986,25(1/2):83
[3]ZhuRZ,[J].Oxid.Met.,1987,27(3/4):253
[4]BourhisY,JohnCS.Na2SO4andNaCl-inducedhotcorrosionof sixnickel-basesuperalloys[J].Oxid.Met.,1975,9(5/6):507
[5]KameswaSR.TheroleofNaClinthehot-corrosionbehaviorof nimonicalloy90[J].Oxid.Met.,1986(1/2):33
[6]CuiH,ZhangJS,MurataY,etal.HotcorrosionbehaviorofNi-basedsuperalloywithhigherCrcontents-partⅡ.Mechanismof hotcorrosionbehavior[J].J.Univ.ofSci.Tech.Beijing,1996,3:91
[7]HuangQY,LiHK.HighTemperatureAlloy[M].Beijing:Metal lurgicalIndustryPress,April,2000,100-133(黄乾尧,李汉康等编著.高温合金[M].北京:冶金工业出版社,2000:100-133)
[8]RobertI,RappA.Hotcorrosionofmaterials:afluxingmechanism[J].Corros.Sci.,2002,44:209
[9]LiY,YuanC,GuoJT,YangHC.Isothermaloxidationbehaviorof acastNi-basesuperalloyK35[J].ActaMetall.Sin.,2003,39(7):749(李云,袁超,郭建亭,杨洪才.铸造镍基高温合金K35的高温氧化行为[J].金属学报,2003,39(7):749)
[10]LiSS,HanYF,XiaoCB.CorrosionresistancesofNi3Albasedal loyIC6andMCrAlYoverlaycoatings[J].Chin.J.Nonferrous Metals.2003,13(6):1451(李树索,韩雅芳,肖程波等.Ni3Al基合金IC6及MCrAlY包覆涂层的抗腐蚀性能[J].中国有色金属学报,2003,13(6):1451)
[11]EcerGM,MeierGH.Oxidationofhigh-chromiumNi-Cral loys[J].Oxid.Met.,1979,13(3/4):119
[12]BenG,Abderrazlk,MoulinG,etal.Relationbetweenimpurities andoxide-scalegrowthmechanismsonNi-34CrandNi-20Cralloys.I.influenceofC,Mn,andSi[J].Oxid.Met.,1990,33(3/4):191
[13]LiHQ,WangZF,ChenJ.StudyonoxidationkineticsofFe-Cr-Ni-Alheat-resistantcastalloys[J].Cast,1998,3:23(李河清,王执福,陈俊.铸造Fe-Cr-Ni-Al耐热合金氧化动力学分析[J].铸造,1998,3:23)
[14]LiY,YuanC,GuoJT,YangHC.Theoxidationkineticsofcast Ni-basesuperalloyK35[J].NortheasternUniv.(Nat.Sci.),2003,24(1):75(李云,袁超,郭建亭,杨洪才.镍基铸造高温合金K35的氧化动力学[J].东北大学学报(自然科学版),2003,24(1):75)
[15]LiMS.High-TemperatureCorrosionofMetal[M].Beijing:Met allurgicalIndustryPress,May,2001,5(李美栓.金属的高温腐蚀[M].北京:冶金工业出版社,2001:5) |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
