LiCl 및 LiCl- Li 2 O  용융염에서 Fe-Ni-Cr 합금의 부식거동 연구

조수행; 장준선; 홍순석; 신영준; 박현수; Soo-Haeng Cho; Jun-Shan Zhang; Sun-Suk Hong; Young-Joon Shin; Hyun-Soo Park

Korean Journal of Materials Research, Vol.10, No.7, 471-477, July, 2000

Export Citation

LiCl 및 LiCl- Li 2 O 용융염에서 Fe-Ni-Cr 합금의 부식거동 연구

A Study on the Corrosion Behavior of Fe-Ni-Cr Alloys in Molten Salts of LiCl and LiCl- Li 2 O

조수행, 장준선¹, 홍순석, 신영준, 박현수

한국원자력연구소
¹대현이공대학 재료공정계

Soo-Haeng Cho, Jun-Shan Zhang¹, Sun-Suk Hong, Young-Joon Shin, and Hyun-Soo Park

Korea Atomic Energy Research Institute, Taejeon, 305-353, Korea
¹Dept. of Materials Eng., Dalian University of Technolgy, Dalian, China

초록

Fe-Ni-Cr 합금의 용융염 부식거동을 650 850 ? C 온도범위에서 조사하였다. 용융염 LiCl에서 Cr을 포함하지 않는 KSA(Kaeri Superalloy)-1 합금은 Fe의 내부산화가 발생하고, Cr을 포함한 KSA-4, Incoloy 800H와 KSA-5는 LiCrO 2 의 치밀한 보호막이 형성되었다. 혼합용융염 LiCl?LiO 2 O에서 KSA-1은 Fe의 내부산화, KSA-4는 Cr의 내부산화가 발생하였고, Cr 농도가 높은 Incoloy 800H와 KSA-5는 LiCrO 2 의 다공성 피 이 형성되었다. 혼합용융염 LiCl?Li 2 O 에서는 Cr 농도의 증가에 따라 부식속도가 증가하였으며, 부식속도는 시간의존선을 8%Cr 이하의 합금에서는 포물선법칙, 8%Cr 이상의 합금에서는 직선법칙을 나타내었다. 이러한 현상은 Li 2 O에 의한 보호성 산화물 Cr 2 O 3 의 염기성 용해기구로 설명할 수 있다.

Corrosion behavior of Fe-Ni-Cr alloy in molten salts of LiCl and LiCl- Li 2 Owasinvestigatedinthetempera?turerangeof 650~850^{\circ}C.InthemoltensaltofLiCl,andinternaloxidationofFeoccurredintheKSA(KaeriSuperalloy)?1alloywithoutcontainingCr,whileadenseprotectiveoxidescaleof LiCrO_2wasformedintheKSA?4,Incoloy800HandKSA?5alloys.InthemixedmoltensaltofLiCl? Li_2O,internaloxidationofFeandCrtookplaceintheKSA?1andKSA?4alloys,respectively.Non?protectiveporousoxidescalesconsistingof LiCrO_2andNiwereformedintheIncoloy800HandKSA?5.ThecorrosionrateofthealloysincreasedwiththeincreaseinCrcontentandthecorrosionratefollowedtheparaboliclawforthealloycontainingCrcontentlessthan8 Li_2Owasinterpretedintermsofthebasicfluxingmechanismofprotectiveoxidescaleof Cr_2O_3$ .

Keywords:Fe-Cr-Ni alloys;Corrosion;High temperature corrosion

[References]

Kohl FJ, Santoro GJ, Stearns CA, Fryburg GC, Rosner DE, J. Electrochem. Soc., 126, 1054 (1979)
Reid WT, Corey RC, Cross BJ, Trans. ASME, 67, 279 (1945)
Simons EL, Browning GV, Liebhafsky HA, Corrosion, 11, 505 (1955)
Bornstein NS, DeCrescente MA, Trans. Met. Soc. AIME, 245, 583 (1969)
Bornstein NS, DeCrescente MA, Met. Trans., 2, 2875 (1971)
Geobel JA, Pettit FS, Met. Trans., 1, 1943 (1970)
Geobel JA, Pettit FS, Goward GW, Met. Trans., 4, 261 (1973)
Gupta DK, Rapp RA, J. Electrochem. Soc., 127, 2194 (1980)
Zhang YS, Rapp RA, J. Electrochem. Soc., 132, 734 (1985)
Zhang YS, J. Electrochem. Soc., 133, 655 (1986)
Cho SH, Park SC, Jeong MS, Zhang JS, Shin YS, Korean J. Mater. Res., 9, 211 (1999)
Cho SH, Park SC, Zhang JS, Shin YJ, Park HS, Korean J. Mater. Res., 9, 556 (1999)
Cho SH, Park SC, Zhang JS, Oh SC, Shin YJ, J. Kor. Inst. Met. Mater., 38, 704 (2000)
Kubaschewski O(ed.), Hopkins BE, Butterworths(ed), Oxidation of Metals and Alloys/ Butterworths and Co. Ltd, pp.138, 1962 (1962)
Rapp RA, Goto KS, Braunstein J(ed.), Selman JR(ed.), J. Electrochem. Soc., 159 (1980)
Rapp RA, Zhang YS, Molten Salts Forum, 5-6, 25 (1998)
Rapp RA, Mater. Sci. Eng., 87, 319 (1987)
Jones DA, Principles and Prevention of Corrosion/ Macmilian Publishing Company, 1992 (1992)
Gupta DK, Rapp RA, J. Electrochem. Soc., 127, 2656 (1980)
Zhang YS, Rapp RA, J. Electrochem. Soc., 132, 2498 (1985)
Cho SH, Zhang JS, Jeong MS, Oh SC, Shin YJ, Korean J. Mater. Res., 9(10), 985 (1999)

[Referenced By]

[1] Kohl FJ, Santoro GJ, Stearns CA, Fryburg GC, Rosner DE, J. Electrochem. Soc., 126, 1054 (1979)

[2] Reid WT, Corey RC, Cross BJ, Trans. ASME, 67, 279 (1945)

[3] Simons EL, Browning GV, Liebhafsky HA, Corrosion, 11, 505 (1955)

[4] Bornstein NS, DeCrescente MA, Trans. Met. Soc. AIME, 245, 583 (1969)

[5] Bornstein NS, DeCrescente MA, Met. Trans., 2, 2875 (1971)

[6] Geobel JA, Pettit FS, Met. Trans., 1, 1943 (1970)

[7] Geobel JA, Pettit FS, Goward GW, Met. Trans., 4, 261 (1973)

[8] Gupta DK, Rapp RA, J. Electrochem. Soc., 127, 2194 (1980)

[9] Zhang YS, Rapp RA, J. Electrochem. Soc., 132, 734 (1985)

[10] Zhang YS, J. Electrochem. Soc., 133, 655 (1986)

[11] Cho SH, Park SC, Jeong MS, Zhang JS, Shin YS, Korean J. Mater. Res., 9, 211 (1999)

[12] Cho SH, Park SC, Zhang JS, Shin YJ, Park HS, Korean J. Mater. Res., 9, 556 (1999)

[13] Cho SH, Park SC, Zhang JS, Oh SC, Shin YJ, J. Kor. Inst. Met. Mater., 38, 704 (2000)

[14] Kubaschewski O(ed.), Hopkins BE, Butterworths(ed), Oxidation of Metals and Alloys/ Butterworths and Co. Ltd, pp.138, 1962 (1962)

[15] Rapp RA, Goto KS, Braunstein J(ed.), Selman JR(ed.), J. Electrochem. Soc., 159 (1980)

[16] Rapp RA, Zhang YS, Molten Salts Forum, 5-6, 25 (1998)

[17] Rapp RA, Mater. Sci. Eng., 87, 319 (1987)

[18] Jones DA, Principles and Prevention of Corrosion/ Macmilian Publishing Company, 1992 (1992)

[19] Gupta DK, Rapp RA, J. Electrochem. Soc., 127, 2656 (1980)

[20] Zhang YS, Rapp RA, J. Electrochem. Soc., 132, 2498 (1985)

[21] Cho SH, Zhang JS, Jeong MS, Oh SC, Shin YJ, Korean J. Mater. Res., 9(10), 985 (1999)