纯镍在900℃熔盐中的热腐蚀行为
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摘要
通过对纯镍在900℃熔融盐w(NaCl)=25%-w(Na_2SO_4)=75%和Na_2SO_4中进行恒温热腐蚀实验,研究了不同熔融盐成分对纯镍在恒温热腐蚀期间的腐蚀特征、行为和机理.结果表明:Ni在2种熔融盐腐蚀过程中无选择性和顺序性,不存在腐蚀孕育期,腐蚀产物均以NiO和Ni3S2为主,在w(NaCl)=25%-w(Na_2SO_4)=75%熔融盐中的腐蚀速率明显大于在Na_2SO_4熔融盐中.在Na_2SO_4熔融盐中,纯镍的氧化、硫化同时进行,热腐蚀形态表现为从表面氧化膜内侧向基体内部延伸的内氧化物与内硫化物分布;在w(NaCl)=25%-w(Na_2SO_4)=75%熔融盐中,是氧化、硫化和氯化三者相互作用增强的结果,氯和硫在热腐蚀过程中起着重要的作用.
The influence of molten salt composition on hot corrosion feature,behavior,and mechanism of pure nickel corroded in molten salts w(NaCl)=25%-w(Na_2SO_4)=75%and Na_2SO_4 at constant temperature of 900℃is investigated by means of hot-corrosion experiment on them in molten salt at constant temperature.Experimental result shows that there will be neither corrosion incubation period nor selectivity and ordering for Ni during the corrosion in both the salts,and the corrosion products will be mainly composed of NiO and Ni3 S2.Corrosion rate in w(NaCl)=25%-w(Na_2SO_4)=75%salt will be obviously larger than that in Na_2SO_4 salt.Simultaneous oxidation and sulfuration of pure nickel hot corroded in Na_2SO_4 salt will take place and its hot corrosion form will exhibit as the distribution of internal oxides and sulfides from inner side of surface oxide film extending to the substrate interior.In w(NaCl)=25%-w(Na_2SO_4)=75% salt,hot corrosion process will include sulfuration,oxidation,and chlorination with chlorine and sulfur playing an important role in the process of hot corrosion.
The influence of molten salt composition on hot corrosion feature,behavior,and mechanism of pure nickel corroded in molten salts w(NaCl)=25%-w(Na_2SO_4)=75%and Na_2SO_4 at constant temperature of 900℃is investigated by means of hot-corrosion experiment on them in molten salt at constant temperature.Experimental result shows that there will be neither corrosion incubation period nor selectivity and ordering for Ni during the corrosion in both the salts,and the corrosion products will be mainly composed of NiO and Ni3 S2.Corrosion rate in w(NaCl)=25%-w(Na_2SO_4)=75%salt will be obviously larger than that in Na_2SO_4 salt.Simultaneous oxidation and sulfuration of pure nickel hot corroded in Na_2SO_4 salt will take place and its hot corrosion form will exhibit as the distribution of internal oxides and sulfides from inner side of surface oxide film extending to the substrate interior.In w(NaCl)=25%-w(Na_2SO_4)=75% salt,hot corrosion process will include sulfuration,oxidation,and chlorination with chlorine and sulfur playing an important role in the process of hot corrosion.
引文
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[2]陈素秋.镍的性质及用途[J].中国有色冶金,1980(10):59-62.
[3]刘海定,王东哲,魏捍东,等.高性能镍基耐腐蚀合金的开发进展[J].材料导报,2013,27(3):99-105.
[4]SEQUEIRA C A C,CARDOSO D S P,AMARAL L,et al.On the performance of commercially available corrosion-resistant nickel alloys:a review[J].Corrosion Reviews,2016,34(4):187-200.
[5]李云,郭建亭,袁超,等.镍基铸造高温合金K35的热腐蚀行为[J].中国腐蚀与防护学报,2005,25(4):250-255.
[6]朱日彰,左禹,郭曼玖.镍基高温合金热腐蚀过程中内硫化一内氧化机制的探讨[J].金属学报,1985,21(6):451-455.
[7]赵双群,谢锡善.新型镍基高温合金在模拟燃煤锅炉环境中的腐蚀[J].金属学报,2004,40(6):659-663.
[8]王健,李辰昊,张铁邦,等.Ni-Cr-W基高温合金熔盐环境中的热腐蚀行为[J].宇航材料工艺,2014(6):26-29.
[9]李远士,王富岗,朱焱,等.纯镍和镍基合金在ZnCl2-KCl盐膜下的腐蚀[J].稀有金属材料与工程,2001,30(5):376-379.
[10]马海涛.高温氯盐环境中金属材料的腐蚀[D].大连:大连理工大学,2003.
[11]宁礼奎.四种镍基高温合金的抗热腐蚀性能研究[D].大连:大连理工大学,2008.
[12]TSAUR C C,ROCK J C,WANG C J,et al.The hot corrosion of310stainless steel with pre-coated NaCl/Na2SO4 mixtures at750℃[J].Materials Chemistry and Physics,2005(89):445-453.
[13]路阳,成波,王军伟,等.不锈钢在熔融NaCl中的电化学-化学-稀释模型[J].材料科学与工艺,2015,23(2):75-80.
[14]胡发恩.GH4698合金的高温氧化、热腐蚀及热疲劳性能的研究[D].南京:南京航空航天大学,2006.
[15]SEHWALM C,SEHUTZE M.The corrosion behavior of several heat resistant materials in air+2vol-%Cl2at 300to800℃Part I-Fe-base and Fe-containing alloys[J]Materials and Corrosion,2000,51(3):34-49.