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LiCl 및 LiCl-${Li_2}O$ 용융염에서 Fe-Ni-Cr 합금의 부식거동 연구
조수행,장준선,홍순선,신영준,박현수,Jo, Su-Haeng,Jang, Jun-Seon,Hong, Sun-Seon,Sin, Yeong-Jun,Park, Hyeon-Su 한국재료학회 2000 한국재료학회지 Vol.10 No.7
Fe-Ni-Cr 합금의 용융염 부식거동을 $650~850^{\circ}C$ 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 $Cr_2O_3$의 염기성 용해기구로 설명할 수 있다. Corrosion behavior of Fe-Ni-Cr alloy in molten salts of LiCl and LiCl-$Li_2O was investigated in the tempera-ture range of $650~850^{\circ}C$. In the molten salt of LiCl, and internal oxidation of Fe occurred in the KSA(Kaeri Superalloy)-1 alloy without containing Cr, while a dense protective oxide scale of $LiCrO_2$ was formed in the KSA-4, Incoloy 800H and KSA-5 alloys. In the mixed molten salt of LiCl-$Li_2O$, internal oxidation of Fe and Cr took place in the KSA-1 and KSA-4 alloys, respectively. Non-protective porous oxide scales consisting of $LiCrO_2$ and Ni were formed in the Incoloy 800H and KSA-5. The corrosion rate of the alloys increased with the increase in Cr content and the corrosion rate followed the parabolic law for the alloy containing Cr content less than 8%, and the linear law for the alloy containing Cr content more than 8%. Such a corrosion behavior of the alloy in the mixed molten salt of LiCl-$Li_2O$ was interpreted in terms of the basic fluxing mechanism of protective oxide scale of $Cr_2O_3$.
고온 용융염에서 Fe기 및 Ni기 초합금의 부식거동 및 합금원소의 영향
조수행,장준선,정명수,오승철,신영준,Jo, Su-Haeng,Jang, Jun-Seon,Jeong, Myeong-Su,O, Seung-Cheol,Sin, Yeong-Jun 한국재료학회 1999 한국재료학회지 Vol.9 No.10
Incoloy 800H, KSA (Kaeri Superalloy)-6, Inconel 600 및 Hastelloy C-276 합금의 용융염에서의 부식거동을 650~85$0^{\circ}C$ 온도범위에서 조사하였다. LiCl-Li$_2$O혼합용융염에서의 부식은 Li$_2$O에 의한 염기성 용해 기구에 의해 진행되며, 부식속도가 LiCl에서보다 훨씬 빠르게 나타났다. 혼합용융염 LiCl-Li$_2$O에서는 Ni기 합금의 부식속도가 Fe기 합금보다 빠르고, Mo와 W의 함량이 높은 Hastelloy C-276이 가장 빠른 부식속도를 나타내었다. 용융염 LiCl에서는 LiCrO$_2$의 단일 부식층이 형성되고, LiCl-Li$_2$O 혼합용융염에서는 산화물과 Ni의 2상구조의 다공성 부식층이 형성되었다. Corrosion behaviors of Incoloy 800H, KSA(Kaeri Superalloy)-6, Inconel 600 and Hastelloy C-276 in molten salts were investigated in the temperature range of 650 ~ $850^{\circ}C$. Due to $\textrm{Li}_{2}\textrm{O}$-induced basic fluxing mechanism, the corrosion rates of the alloys in mixed molten salt of LiC1-$\textrm{Li}_{2}\textrm{O}$ were significantly higher than those in molten salt of LiCl. In the mixed molten salt, Fe-base alloys showed higher corrosion resistance than the Ni-base alloys. and Hastelloy C-276 with high Mo and W contents exhibited the highest corrosion rate among the examined alloys. The single layer of $\textrm{LiCrO}_{2}$ was formed in molten salt of LiCl and two phase structure of a scale consisted of oxides and Ni was formed in the mixed molten salt.
오스테나이트 합금의 용융염부식 및 고온산화에 미치는 Si 농도와 RE 첨가의 영향
조수행,장준선,오승철,신영준,박성원,Jo, Su-Haeng,Jang, Jun-Seon,O, Seung-Cheol,Sin, Yeong-Jun,Park, Seong-Won 한국재료학회 2002 한국재료학회지 Vol.12 No.1
The corrosion behavior of alloys in a molten salt was investigated along with the oxidation characteristics in the air. The basic composition of alloys in the study was Fe-25Ni-7Cr with Si and RE(rare-earth metal) as additives. The corrosion rate of the alloys was low in a molten salt of LiCl while the rate was high in the mixed molten salt of LiCl and $Li_2O$. When Si is added to the base alloy of Fe-25Ni-7Cr, corrosion resistance was improved as the Si content is increased up to 3%, however, it was observed that the corrosion resistance was getting worse as the Si content is increased. The base alloy with 2.43% of Si and 0.9% of RE(KSA-65), showed higher corrosion rate compared to that of KSA-63 alloy with an equivalent amount of only Si. The corrosion resistance of KSA-65 was similar to that of the base alloy(KSA-60). The oxidation resistance of KSA-65 alloy was greatly increased even at $850^{\circ}C$ for a long term exposure.
용융염 LiCl 및 LiCl-$Li_2O$에서 내열합금 More 1과 Super 22H의 부식거동
조수행,박상철,장준선,신영준,박현수,Jo, Su-Haeng,Park, Sang-Cheol,Jang, Jun-Seon,Sin, Yeong-Jun,Park, Hyeon-Su 한국재료학회 1999 한국재료학회지 Vol.9 No.6
The corrosion behavior of heat-resistant alloys, More 1 and Super 22H in molten salts of LiCl and $LiCl-Li_2$O was investigated in the temperature range of $650~850^{\circ}C$. In a molten salt of LiCl, a dense protective oxide scale of $LiCrO_2$ was formed, following growth of oxide scale with parabolic kinetics. But in a mixed molten salt of LiCl, a dense protective oxide scale of $LiCrO_2$ was formed, following growth of oxide scale with parabolic kinetics. But in a mixed molten salt of $LiCl-Li_2$O, a porous non-protective scale of Li\ulcorner(Cr, Ni, Fe)\ulcornerO$_2$was formed, following growth of oxide scale with linear kinetics. The corrosion rate increased slowly with the increase of temperature up to $750^{\circ}C$, but above $750^{\circ}C$ rapid increase in corrosion rate observed. The corrosion behavior of Super 22H alloy was similar to that of More 1 alloy, but Super 22H showed higher corrosion resistance than More 1.
A Study on the Corrosion Behavior of Austenitic Stainless Steel in Hot Molten Salt
조수행,박상철,정명수,장준선,신영준,Jo, Su-Haeng,Park, Sang-Cheol,Jeong, Myeong-Su,Jang, Jun-Seon,Sin, Yeong-Jun Materials Research Society of Korea 1999 한국재료학회지 Vol.9 No.2
LiCl 및 $LiCl/Li_2O$ 용융염분위기에서 오스테나이트 스테인레스강, SUS 316L과 SUS 304L의 부식특성을 650~$850^{\circ}C$ 온도범위에서 조사하였다. SUS 316L과 304L의 부식층은 외부 $Li(CrFe)O_2와 내부 Cr_2O_3$의 2층 구조를 형성하였다. LiCl 용융염중에서는 균일한 부식충이 형성되지만, $LiCl/Li_2O$ 혼합용융염중에서는 균일한 부식충 형성외에 업계부식이 발생되는 것을 알 수 있었다. $750^{\circ}C$까지 온도 증가에 따른 부식속도의 증가속도는 느리고, $750^{\circ}C$ 이상에서는 부식속도가 급격히 증가하였다. 용융염분위기에서 SUS 316L은 SUS 304L에 비하여 부식속도가 느려셔 보다 좋은 내식성을 나타내였다. Corrosion behavior of austenitic stainless steels of SUS 316L and SUS304L in molten salt of LiCl and $LiCl/Li_2O$ has been investigated in the temperature range of $650~850^{\circ}C$. Corrosion products of SUS316L and 304L in hot molten salt consisted of two layers-an outer layer of Li(CrFe)$O_2$and an inner layer of$Cr_2O_3$. The corrosion layer was uniform in molten salt of LiCl, but the intergranular corrosion occurred in addition to the uniform corrosion in mixed molten salt of LiCl/$Li_2O$. The corrosion rate increased slowly with the increase of temperature up to $750^{\circ}C$, but above $750^{\circ}C$ rapid increase in corrosion rate observed. SUS316L stainless steel showed slower corrosion rate than SUS 304L, exhibiting higher corrosion resistance in the molten salt.
신영준,조수행,도재범,장준선 한국공업화학회 2000 응용화학 Vol.4 No.2
In the development of the advanced spent fuel management process based on the molten salt technology, it is essential to choose the optimum material for the process equipment handling molten salt. Corrosion behavior of SUS 316L, Incoloy 800H, Inconel 600 and KSA(Kaeri Superalloy)-9 in molten salts was investigated in the temperature range of 650 ∼ 850℃. In a molten salt of LiCl, a dense protective oxide scale of LiCrO₂ was formed, following growth of oxide scale with parabolic kinetics. But in a mixed molten salt of LiCl-Li₂O, non-protective porous oxide scales consisting of LiCrO₂ and Ni were formed, following growth of oxide scale with linear kinetics.
LiCl 및 LiCl-Li2O 용융염에서 스테인레스강과 내열강의 부식거동에 관한 연구
박상철,신영준,조수행,오승철,장준선 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.5
In the development of the advanced spent fuel management process based on the molten salt technology, it is essential to choose the optimum material for the process equipment handling molten salt. The corrosion behavior of SUS 304L, SUS 316L, More 1 and Super 22H in molten salts was investigated in the temperature range of 650-850℃. In a melton salt of LiCl, a dense protective oxide scale of LiCrO₂ was formed, following growth of oxide scale with parabolic kinetics. But in a mixed molten salt of LiCl-Li₂O, a porous non-protective scale of Li_x(Cr, Ni, Fe)_(2-X)O₂ was formed, following growth of oxide scale with linear kinetics. As the increase of the temperature up to 850℃, the corrosion rate increased slightly in molten salt of LiCl. But in a mixed molten salt of LiCl-Li₂O, the corrosion rate increased rapidly above 750℃. The corrosion behaviors of SUS 304L. and SUS 316L was similar to those of More 1 and Super 22H. But SUS 304L and SUS 316L showed higher corrosion resistance than More 1 and Super 22H.