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Effect of Ni and Cu Addition on Corrosion Behaviors of Pre-Oxidized Ultra-Strong Steel for Automotive Applications
Ni 및 Cu 첨가가 고온 산화된 자동차용 초고강도 강재의 부식 거동에 미치는 영향
Seung Min Ryu, Hwan Goo Seong, Jeong Kil Kim, Joong-Ki Hwang, Man Jae Lee, Min-Suk Oh, Sung Jin Kim
류승민, 성환구, 김정길, 황중기, 이만재, 오민석, 김성진
Korean J. Met. Mater. 2019;57(6):343-351.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.343

Abstract
The incomplete elimination of oxide scale formed during the normalizing process can result in severe degradation of the surface and mechanical properties of ultra-strong steels. This study revealed that the formation of oxide scale was highly dependent upon the alloying elements Ni and Cu. Ni-bearing steel showed a much higher..... More

                        
Corrosion of Hot-dip Aluminized 9Cr-1Mo Steel in N2/0.1%H2S Gas
Muhammad Ali Abro, Junhee Hahn, Dong Bok Lee
Korean J. Met. Mater. 2019;57(4):236-244.   Published online 2019 Apr 5
DOI: https://doi.org/10.3365/KJMM.2019.57.4.236

Abstract
ASTM P91 steel (viz. 9Cr-1Mo steel) was hot-dip aluminized to form a ~70 μm thick coating, and was then corroded in N2/0.1%H2S gas for 50 h at 800 and 900 ºC, to study the effect of aluminizing on the corrosion resistance of P91 steel in highly corrosive H2S environments. Before..... More

                        
Effects of Added Cr and Ni on the Resistance of -Iron Surface to Cl<sub>2</sub> Gas Corrosion
크롬과 니켈 첨가가 α-Fe 표면의 염소 가스 부식 특성에 미치는 영향
Jiwoong Kim, MyungJae Kim, Chang Yul Seo, Jungho Ryu, Taegong Ryu, Hye-Jin Hong, Yong Jae Suh
김지웅, 김명재, 서창열, 류정호, 류태공, 홍혜진, 서용재
Korean J. Met. Mater. 2019;57(2):108-114.   Published online 2019 Feb 5
DOI: https://doi.org/10.3365/KJMM.2019.57.2.108

Abstract
As energy generation by recycling biomass has become increasingly attractive, research on biomass recycling has focused on improving operational efficiency. To develop a new material composition for the inner wall of a biomass boiler, we investigated the effect of Cr and Ni addition on the resistance of the α-iron (100)..... More

                        
Corrosion Resistance and Adhesion of Paint Coating Film on Zn-Mg-Al Hot-Dip Galvanized Steel Sheets
아연-마그네슘-알루미늄 합금도금강판의 도장 내식성 및 밀착성
Jae-Won Lee, Bora Park, Sung Jin Kim
이재원, 박보라, 김성진
Korean J. Met. Mater. 2019;57(2):77-83.   Published online 2019 Jan 9
DOI: https://doi.org/10.3365/KJMM.2019.57.2.77

Abstract
Zn-Al-Mg alloy galvanized steel sheets have excellent corrosion resistance and improved cut-edge corrosion resistance. Most of the galvanized steel sheets used for outdoor applications are coated again on the galvanizing layer, or after a plastic film is laminated. As the corrosion products formed by the corrosion of Zn accumulate over..... More

                        
Resistance to Stress Corrosion Cracking of High-Strength 7xxx Series Aluminum Alloys in 3.5% NaCl Solution
항공용 고강도 7xxx계 알루미늄 합금의 3.5% NaCl 수용액에서의 응력부식균열 저항성
Yurim Lee, Heesoo Choi, Soojin Ahn, Cheoljoo Lee, Sangshik Kim
이유림, 최희수, 안수진, 이철주, 김상식
Korean J. Met. Mater. 2018;56(10):708-717.   Published online 2018 Oct 5
DOI: https://doi.org/10.3365/KJMM.2018.56.10.708

Abstract
For proper maintenance and inspection scheduling of aircraft, it is extremely important to measure the resistance to stress corrosion cracking (SCC) behavior of aluminum alloys used for aircraft structures. The SCC resistances of high-strength 7xxx-series aluminum alloys, including 7050-T7451, 7475-T7351 and 7140-T7451, were evaluated along longitudinal (L) and transverse (T)..... More

                           Cited By 1
Analysis on Variations in Underwater Electromagnetic Signals of a Surface Ship as Varying Placement of ICCP Anodes
ICCP 양극 배치 변화에 따른 수중 전자기 신호 변화 분석
Sangkyu Lee, Hyun-Ju Jung, Chang-Seob Yang
이상규, 정현주, 양창섭
Korean J. Met. Mater. 2018;56(8):628-634.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.628

Abstract
The impressed current cathodic protection (ICCP) is widely used for preventing galvanic corrosion and it strongly influences the underwater electromagnetic signals of a surface ship. For military use, the signals should be reduced to avoid threats such as modern naval weapons triggered by the signals. We analyzed the underwater electric..... More

                        
Effect of Carbon Contents on Corrosion and Hydrogen Diffusion Behaviors of Ultra-Strong Steels for Automotive Applications
탄소함량이 자동차용 초고강도 철강소재의 부식 및 수소 확산 거동에 미치는 영향
Eun Hye Hwang, Hwan Goo Seong, Sung Jin Kim
황은혜, 성환구, 김성진
Korean J. Met. Mater. 2018;56(8):570-579.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.570

Abstract
Recently developed ultra-strong GIGA STEEL exhibites superior mechanical properties, with a high tensile strength of more than 1.5 GPa and good impact toughness. Nevertheless, its application to auto parts has been severely restricted, mainly due to a substantial reduction in the resistance to hydrogen embrittlement (HE) induced by aqueous corrosion...... More

                           Cited By 3
High-temperature Corrosion of CrAlSiN Thin Films in N<sub>2</sub>/0.1%H2S Gas
Muhammad Ali Abro, Junhee Hahn, Dong Bok Lee
Korean J. Met. Mater. 2018;56(4):272-279.   Published online 2018 Apr 5
DOI: https://doi.org/10.3365/KJMM.2018.56.4.272

Abstract
Cr25.2Al19.5Si4.7N50.5 thin films were deposited on steel substrates by cathodic arc plasma deposition. They consisted of alternating fcc-Cr(Al)N/hcp-Al(Cr,Si)N nanolayers. They were corroded at 900 and 1000 oC for 5-100 h in N2/0.1%H2S gas atmosphere. Their corrosion mechanism, the structure of the formed scales, and the role of film-constituting elements during..... More

      
Study on the Part Unit Corrosion Evaluation for Automotive Lower Arm Using Electrochemical Cyclic Corrosion Test
전기화학적 순환부식 시험법을 활용한 자동차 로어암의 단품단위 부식평가에 관한 연구
Seon-Hong Kim, Ji-Hoon Lee, Jung-Gu Kim, Min Jang
김선홍, 이지훈, 김정구, 장민
Korean J. Met. Mater. 2018;56(2):103-112.   Published online 2018 Feb 5
DOI: https://doi.org/10.3365/KJMM.2018.56.2.103

Abstract
This research focused on the development of the part unit evaluation for an organic coated automotive lower arm using the electrochemical cyclic corrosion test (E-CCT). The E-CCT accelerates both the coating degradation and the perforation corrosion. The applied potential for the coating degradation was determined to be -500 mVSCE for..... More

      
Hydrogen Induced Crack Propagation in Bainitic X70 Steel in Hydrogen Pressured Tensile Test
베이나이트계 X70강 수소가압분위기 인장시험의 수소취성균열 전파
Byung Hak Choe, Hyeon Su Jang, Bum Gyu Lee, Eui Soo Kim, Woo Sik Kim, Un Bong Baek, Sung Hoon Nam
최병학, 장현수, 이범규, 김의수, 김우식, 백운봉, 남승훈
Korean J. Met. Mater. 2018;56(1):1-7.   Published online 2018 Jan 1
DOI: https://doi.org/10.3365/KJMM.2018.56.1.1

Abstract
This study investigated hydrogen induced cracking (HIC) of X70 steel, used for gas pipeline material, with a bainitic microstructure. The effect of hydrogen on the steel was investigated by tensiletesting in a high pressure hydrogen atmosphere, using OM, SEM and TEM analyses. The mechanisms of hydrogen-related cracking were represented as..... More

         Cited By 4
Evaluation of the Protective Ability of Air-formed Oxide and Passive Films Formed on Nb-Bearing High Interstitial Stainless Steels
Nb 활용 탄질소 스테인리스강의 부동태 및 대기산화 피막 보호성 연구
Chang-Geun Lee, Heon-Young Ha, Tae-Ho Lee, Kyung-Mox Cho
이창근, 하헌영, 이태호, 조경목
Korean J. Met. Mater. 2017;55(12):870-879.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.870

Abstract
The effects of Nb on grain refinement and the pitting corrosion resistance of Febalance18Cr10 Mn0.3C0.3NxNb (x = 0.1 and 0.2 wt%) high interstitial alloys were investigated through microstructure analysis and potentiodynamic polarization tests. The resistance to pitting corrosion of the two alloys, covered with a passive film and an air-formed..... More

      
Effect of Temperature and Flow Velocity on the Cathodic Protection of Ships and Underwater Electromagnetic Signatures
온도 및 유속이 선박의 음극방식 및 수중 전자기장 신호 특성에 미치는 영향
Yong-Sang Kim, Kyoung-Min Kim, Sangkyu Lee, Jung-Gu Kim
김용상, 김경민, 이상규, 김정구
Korean J. Met. Mater. 2017;55(5):348-356.   Published online 2017 May 9
DOI: https://doi.org/10.3365/KJMM.2017.55.5.348

Abstract
The effects of the temperature and flow velocity on the cathodic protection and underwater electromagnetic signature of ships are investigated using electrochemical tests and boundary element simulations. The corrosion resistance of the materials for the hull and propeller increase at lower temperatures, and the corrosion resistance is significantly decreased under..... More

         Cited By 3
Factors Influencing Plasma Electrolytic Oxidation(PEO) Coatings on Magnesium Alloys: A Review
마그네슘 합금의 플라스마전해산화 코팅에 영향을 미치는 제반 요소들에 대한 고찰
Gunchoo Shim
심건주
Korean J. Met. Mater. 2017;55(5):296-307.   Published online 2017 May 9
DOI: https://doi.org/10.3365/KJMM.2017.55.5.296
Abstract
Magnesium alloys, which possess excellent specific strength and castability, are highly susceptible to corrosion. Although anodizing is widely used to resolve this problem, it requires toxic electrolytes and produces relatively thin and weak surface coatings. Recently, plasma electrolytic oxidation (PEO) has emerged as an alternative to anodizing. Although it is... More
         Cited By 2
High-temperature Corrosion of AlCrTiSiN Film in Ar-1%SO<sub>2</sub> Gas
Poonam Yadav, Sik Chol Kwon, Yue Lin, Shihong Zhang, Dong Bok Lee
Korean J. Met. Mater. 2017;55(4):222-226.   Published online 2017 Apr 6
DOI: https://doi.org/10.3365/KJMM.2017.55.4.222

Abstract
An AlCrTiSiN film composed of 31Al-15Cr-1.7Ti-0.5Si-51.8N (at%) was deposited on a steel substrate by arc ion plating to a thickness of 1 μm. It consisted of nano crystalline hcp-AlN and fcc-CrN. Its corrosion behavior in Ar-1%SO2 gas at 800 ℃ for 5-50 h was studied. The resulting scales consisted primarily..... More

      
Study on the Mechanical Properties and Corrosion Behaviors of Fe-(20, 45) wt% Gd Intermetallics
Fe-(20, 45) wt% Gd 금속간 화합물의 기계적 특성 및 부식 거동 연구
Bo Kyeong Kang, Youl Baik, Yong Choi, Byung Moon Moon
강보경, 백열, 최용, 문병문
Korean J. Met. Mater. 2017;55(2):91-97.   Published online 2017 Feb 2
DOI: https://doi.org/10.3365/KJMM.2017.55.2.91

Abstract
Fe-(20, 45 wt%) Gd intermetallics were vacuum arc melted as the mother alloy of a neutron shielding and absorbing material. The structure of the cast Fe-20 wt% Gd intermetallics had primary dendrites with a short width of about 2 μm, which became coarse with increasing Gd content. The final compositions..... More

      
Effects of Alloying Elements on the Corrosion Properties of High Strength Steel in a Sour Environment
사워(Sour) 환경에서 고강도강의 내식성에 미치는 합금원소의 영향
Youngmin Hyun, Heesan Kim
현영민, 김희산
Korean J. Met. Mater. 2016;54(12):885-892.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.885

Abstract
The effects of alloying elements (Mn, Cr, and C) on the corrosion resistance of steel were examined using weight loss test, polarization test in a sour environment, analysis of rust, and the prediction of stable corrosion product. Carbon was found to improve corrosion resistance after 7-day immersion, while manganese and..... More

         Cited By 1
Effects of Induction Heat Bending and Heat Treatment on the Boric Acid Corrosion of Low Alloy Steel Pipe for Nuclear Power Plants
Ki-Tae Kim, Min-Chul Shin, Hyun-Young Chang, Heung-Bae Park, Gi-Ho Sung, Young-Sik Kim
Korean J. Met. Mater. 2016;54(11):817-825.   Published online 2016 Nov 5
DOI: https://doi.org/10.3365/KJMM.2016.54.11.817
Abstract
In many plants, including nuclear power plants, pipelines are composed of numerous fittings such as elbows. When plants use these fittings, welding points need to be increased, and the number of inspections also then increases. As an alternative to welding, the pipe bending process forms bent pipe by applying strain... More
      
Effect of Added Magneisum on the Coating Properties of Galvanized Steel Sheets
용융아연 도금특성에 미치는 Mg 미량첨가 영향
Moon-Hi Hong, Deok-Gu Kang, Doo-Jin Paik, Hyeon-Seok Hwang, Sung-ho Park
홍문희, 강덕구, 백두진, 황현석, 박성호
Korean J. Met. Mater. 2016;54(10):723-731.   Published online 2016 Oct 5
DOI: https://doi.org/10.3365/KJMM.2016.54.10.723

Abstract
The effect of a small amount of added Mg on the microstructure, Fe-Al inhibition layer, corrosion resistance and welding properties of hot-dip galvanized and galvannealed steel sheets were investigated. Both the microstructure and distribution of Mg were measured by scanning electron microscopy, transmission electron microscopy, glow discharge spectrometer and electron..... More

         Cited By 1
Material Analysis & Characterization
Study of Water Resistance of Fe<sub>2</sub>O<sub>3</sub> Doped P<sub>2</sub>O<sub>5</sub>ZnOBi<sub>2</sub>O<sub>3</sub> Sealing Glass System
Moon Kyung Hwang, Il Gu Kim, Bong Ki Ryu
Korean J. Met. Mater. 2016;54(8):621-625.   Published online 2016 Aug 5
DOI: https://doi.org/10.3365/KJMM.2016.54.8.621

Abstract
In order to strengthen the structure of the glass and ultimately improve its water resistance, P2O5–ZnO–Bi2O3 was doped with Fe2O3, which generated Fe ions in the phosphate-based glass. These ions constitute (P2O7)−4 groups within the glass network. Structural analysis using Fourier transfer infrared spectroscopy indicated that P-O-P and Bi-O-P bonds..... More

      
3
임채원1 · 임동욱1 · 구본일2 · 심상은1 · 백성현1,*

Received 2019 May 14     Accepted 2019 Aug 21     Published online 2019 Sep 6
Abstract
Electroplating chromium films in a trivalent chromium bath has been extensively investigated as a replacement for the conventional hexavalent chromium bath. However, commercialization of the trivalent chromium method has been hindered because the resulting chromium films exhibit inferior mechanical properties compared to hexavalent chromium coated film. In this study, we... More
      
Fe-18Mn
최희수1 · 김수민1 · 성효경1 · 김성준2 · 김상식1,*

Received 2019 Jul 3     Accepted 2019 Aug 12     Published online 2019 Sep 6
Abstract
High-Mn steels developed for offshore industries require good resistance to stress corrosion cracking (SCC) in seawater. Elements like Cr and N are often added to improve the resistance to SCC. In this study, the SCC behavior of Fe18Mn3Cr0.1N and Fe19Mn19Cr0.6N steels in artificial seawater was examined. Slow strain rate tests were... More
      
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