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| K_2SO_4-Na_2SO_4 INDUCED LOW TEMPERATURE HOT CORROSION OF Fe-Cr ALLOYS |
| Zhang Yunshu Li Xuauming Shi Liangquan Shih Shengtai (Shanghai Institute of Metallurgy;Academia Sinica) |
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Abstract Low temperature hot corrosion (LTHC)behavior of Fe-Cr alloys with 5 to 50 (wt)% of chromium in the presence of a K_2SO_4-Na_2SO_4 salt film was studied in O_2- 0.1,0.5 and 1.0% (SO_2+SO_3) gas environments in the temperature range of 560 to 750℃.Corrosion kinetics were measured gravimetrically,and corrosion product scales were physically examined and chemically analyzed.The experimental results indicate that the alloys with chromium contents below a certain critical value are subject to LTHC.The LTHC is related to the formation of a low melting complex sulfate containing K,Na and Fe.Fe~(3+) is believed to take part in the reduction reaction,and the countertransport of Fe~(3+)/Fe~(3+)carries the reduction reaction of O_2 and SO_3 to the melt/gas interface,which is responsible for the rapid corrosion.It is also indicated that the addition of chromium re- sults in higher LTHC resistance of iron base alloys.
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Received: 25 February 1991
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[1] Corey,R.C.;Cross.B.J.;and Reid,W.T;Trans.Amer.Soc.Mech.Engrs.,67,279(1945)
[2] 张允书.李选明.石声泰.中国腐蚀与防护学报10(1) .1(1990)
[3] Rapp,R.A.;and Goto,K.S..in“Molten Salts”.Braustein,J.and Selman,J.R.,Ed.,The Electrochemical Society Softbound Proceedings Series,Pennington,NJ,159(1981)
[4] Zhang.Y,S.,and Rapp.R.A.,J.Electrochem.Soc.,132,2498(1985) |
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