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한국부식방식학회(구 한국부식학회)> Corrosion Science and Technology

Corrosion Science and Technology update

  • : 한국부식방식학회(구 한국부식학회)
  • : 공학분야  >  금속공학
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  • : 1598-6462
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  • : 한국부식학회지(~2001)→Corrosion Science and Technology(2002~)

수록정보
수록범위 : 1권1호(2002)~18권6호(2019) |수록논문 수 : 800
Corrosion Science and Technology
18권6호(2019년 12월) 수록논문
최근 권호 논문
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1Sulphate Reducing Bacteria and Methanogenic Archaea Driving Corrosion of Steel in Deep Anoxic Ground Water

저자 : P. Rajala , M. Raulio , L. Carpen

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 18권 6호 발행 연도 : 2019 페이지 : pp. 221-227 (7 pages)

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During the operation, maintenance and decommissioning of nuclear power plant radioactive contaminated waste is produced. This waste is stored in an underground repository 60-100 meters below the surface. The metallic portion of this waste comprises mostly carbon and stainless steel. A long-term field exposure showed high corrosion rates, general corrosion up to 29 μm a-1 and localized corrosion even higher. High corrosion rate is possible if microbes produce corrosive products, or alter the local microenvironment to favor corrosion. The bacterial and archaeal composition of biofilm formed on the surface of carbon steel was studied using 16S rRNA gene targeting sequencing, followed by phylogenetic analyses of the microbial community. The functional potential of the microbial communities in biofilm was studied by functional gene targeting quantitative PCR. The corrosion rate was calculated from weight loss measurements and the deposits on the surfaces were analyzed with SEM/EDS and XRD. Our results demonstrate that microbial diversity on the surface of carbon steel and their functionality is vast. Our results suggest that in these nutrient poor conditions the role of methanogenic archaea in corrosive biofilm, in addition to sulphate reducing bacteria, could be greater than previously suspected.

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2Fabrication of Superhydrophobic Aluminum Alloy Surface with Hierarchical Pore Nanostructure for Anti-Corrosion

저자 : Hyejeong Ji , Chanyoung Jeong

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 18권 6호 발행 연도 : 2019 페이지 : pp. 228-231 (4 pages)

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Aluminum and its alloys have been widely used in various fields because of low weight, high strength, good conductivity, and low price. It is well known that aluminum alloys that cause natural oxide film can inhibit corrosion in wet, salty environments. However, these oxides are so thin that corrosion occurs in a variety of environments. To prevent this problem, an electrochemical anodizing technique was applied to the aluminum alloy surface to form a thick layer of oxide and a unique oxide shape, such as a hierarchical pore structure simultaneously combining large and small pores. The shape of the structures was implemented using stepwise anodization voltages such as 40 V for mild anodizing and 80 V for hard anodizing, respectively. To maximize water repellency, it is crucial to the role of surface structures shape. And a hydrophobic thin film was coated by 1H, 1H, 2H, 2H-Perfluorodecyltrichlorosilane (FDTS) to minimize surface energy of the structure surface. Thus, such nanoengineered superhydrophobic surface exhibited a high water contact angle and excellent corrosion resistance such as low corrosion current density and inhibition efficiency.

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3Analysis of PVDF Coating Properties with Addition of Hydrophobically Modified Fumed Silica

저자 : Nam Kyu Lee , Young Hoon Kim , Tae Gyu Im , Dong Uk Lee , Minyoung Shon , Myung Jun Moon

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 18권 6호 발행 연도 : 2019 페이지 : pp. 232-242 (11 pages)

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In this study, hydrophobically modified fumed silica was added to the PVDF coating to improve corrosion protection performance. Two types of silane modifiers, trimethylchlorosilane (TMCS) and hexamethyldisilazane (HMDZ), were used for hydrophobic modification of the fumed silica. The composition of modified fumed silica was analyzed by Fourier transform infrared, X-ray photoelectron spectroscopy, and elemental analysis. The dispersion of modified fumed silica in the PVDF coating was observed by the transmission electron microscopy, and the hydrophobicity of PVDF coating was analyzed by the water contact angle. Surface properties were examined by the field emission scanning electron microscopy and scanning probe microscopy. Potentiodynamic polarization was conducted to confirm corrosion protection performance of PVDF coating in terms of hydrophobically-modified fumed silica contents. As a result, the average surface roughness and the water contact angle of the PVDF coating increased with modifier contents. The results of the potentiodynamic polarization test showed an increase of the Ecorr values with increase of the hydrophobicity of PVDF coating. Thus, it clearly indicates that the corrosion protection performance of PVDF coating improved with the addition of the hydrophobic-modified fumed silica that prevents the penetration of moisture into the PVDF coating.

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The pitting corrosion and inhibition studies of AZ31B magnesium alloy were investigated in the alkaline solution (pH12) with chloride and inhibitors. The corrosion behavior of passive film with/without Cl- in the alkaline electrolyte were conducted by polarization curve and immersion tests in the presence of various additives (inhibitors) to clarify the inhibition efficiency of pitting corrosion at higher potential region. Critical concentration of pitting corrosion for Mg alloy was evaluated with 0.005 M NaCl in 0.01 M NaOH on the anodic polarization behavior. Critical pitting of AZ31B Mg alloy in 0.01 M NaOH is a function of chlorides; Epit = - 1.36 - 0.2 log [Cl-]. When the Sodium Benzoate (SB) was only used as an inhibitor, a few metastable pits developed on the Mg surface by an immersion test despite no pitting corrosion on the polarization curve meaning that adsorption of SB on the surface is insufficient protection from pitting corrosion in the presence of chloride. The role of SB and Sodium Dodecylbenzenesulfonate (SDBS) inhibitors for the Mg alloy surface in the presence of chloride was suppressed from pitting corrosion to co-adsorb on the Mg alloy surface with strong formation of passive film preventing pitting corrosion.

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5Deep Learning Based Real-Time Painting Surface Inspection Algorithm for Autonomous Inspection Drone

저자 : Hyung-young Chang , Seung-ryong Han , Heon-young Lim

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 18권 6호 발행 연도 : 2019 페이지 : pp. 253-257 (5 pages)

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A deep learning based real-time painting surface inspection algorithm is proposed herein, designed for developing an autonomous inspection drone. The painting surface inspection is usually conducted manually. However, the manual inspection has a limitation in obtaining accurate data for correct judgement on the surface because of human error and deviation of individual inspection experiences. The best method to replace manual surface inspection is the vision-based inspection method with a camera, using various image processing algorithms. Nevertheless, the visual inspection is difficult to apply to surface inspection due to diverse appearances of material, hue, and lightning effects. To overcome technical limitations, a deep learning-based pattern recognition algorithm is proposed, which is specialized for painting surface inspections. The proposed algorithm functions in real time on the embedded board mounted on an autonomous inspection drone. The inspection results data are stored in the database and used for training the deep learning algorithm to improve performance. The various experiments for pre-inspection of painting processes are performed to verify real-time performance of the proposed deep learning algorithm.

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6Study on Corrosion Properties of Additive Manufactured 316L Stainless Steel and Alloy 625 in Seawater

저자 : Geun-su Jung , Yong-ha Park , Dae-jung Kim , Chae-seon Lim

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 18권 6호 발행 연도 : 2019 페이지 : pp. 258-266 (9 pages)

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The objective of this study was to evaluate corrosion resistance of additive manufactured 316L stainless steel and alloy 625 powders widely used in corrosion resistance alloys of marine industry in comparison with cast alloys. Directed Energy Deposition (DED) method was used in this work for sample production. DED parameter adjustment was also studied for optimum manufacturing and for minimizing the influence of defects on corrosion property. Additive manufactured alloys showed lower corrosion resistance in seawater compared to cast alloys. The reason for the degradation of anti-corrosion property was speculated to be due to loss of microstructural integrity intrinsic to the additive manufacturing process. Application of heat treatment with various conditions after DED was attempted. The effect of heat treatments was analyzed with a microstructure study. It was found that 316L and alloy 625 produced by the DED process could recover their expected corrosion resistance when heat treated at 1200 °C.

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7Effect of Heat Treatment Conditions on Corrosion and Hydrogen Diffusion Behaviors of Ultra-Strong Steel Used for Automotive Applications

저자 : Jin-seong Park , Hwan Goo Seong , Sung Jin Kim

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 18권 6호 발행 연도 : 2019 페이지 : pp. 267-276 (10 pages)

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The purpose of this study was to examine the influence of conditions for quenching and/or tempering on the corrosion and hydrogen diffusion behavior of ultra-strong automotive steel in terms of the localized plastic strain related to the dislocation density, and the precipitation of iron carbide. In this study, a range of analytical and experimental methods were deployed, such as field emission-scanning electron microscopy, electron back scatter diffraction, electrochemical permeation technique, slow-strain rate test (SSRT), and electrochemical polarization test. The results showed that the hydrogen diffusion parameters involving the diffusion kinetics and hydrogen solubility, obtained from the permeation experiment, could not be directly indicative of the resistance to hydrogen embrittlement (HE) occurring under the condition with low hydrogen concentration. The SSRT results showed that the partitioning process, leading to decrease in localized plastic strain and dislocation density in the sample, results in a high resistance to HE-induced by aqueous corrosion. Conversely, coarse iron carbide, precipitated during heat treatment, weakened the long-term corrosion resistance. This can also be a controlling factor for the development of ultra-strong steel with superior corrosion and HE resistance.

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8Effect of Applied Voltage on the Reliability of Coating Flaw Detection of Pipe with Different Buried Depths

저자 : B. T. Lim , M. G. Kim , K. T. Kim , H. Y. Chang , Y. S. Kim

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 18권 6호 발행 연도 : 2019 페이지 : pp. 277-284 (8 pages)

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External corrosion control of buried pipe can be achieved by the combination of barrier coating and cathodic protection. Coating damage and deterioration can be induced by many reasons; damage during handling and laying, enhanced failure at low temperatures, failure during commissioning and operation, disbanding due to inadequate surface cleaning, rock penetration during installation and service etc. This work focused on the effect of survey conditions on the reliability of coating flaw detection of buried pipes. The effects of applied voltage and anode location on the detection reliability of coating flaw of buried pipe in soil with the resistivity of ca. 25.8 kΩ·cm were discussed. Higher applied voltage increased the detection reliability, regardless of buried depth, but deeper burial depth reduced the reliability. The location of the anode has influenced on the detection reliability. This behaviour may be induced by the variation of current distribution by the applied voltage and buried depth. From the relationship between the applied voltage and reliability, the needed detection potential to get a desire detection reliability can be calculated to get 100% detection reliability using the derived equation.

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9650 °C 의 SO2 가스 환경 하에서 T22와 T92 강의 고온 부식특성

저자 : 정광후 ( Kwang-hu Jung ) , 김성종 ( Seong-jong Kim )

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 18권 6호 발행 연도 : 2019 페이지 : pp. 285-291 (7 pages)

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In this study, the corrosion characteristics of T22 and T92 steel were investigated in 6O2 + 16CO2 + 2SO2 gas environment at 650 °C. Corrosion characteristics were characterized by weight gain, oxide layer thickness, scanning electron microscope, optical microscope, energy dispersive X-ray spectroscopy, and X-ray diffraction. T22 and T92 steel tended to stagnate oxide layer growth over time. Oxidation kinetics were analyzed using the data of oxide layer thickness, and a regression model was presented. The regression model was significantly acceptable. The corrosion rate between the two steels through the regression model showed significant difference. The T92 steel was approximately twice as large as the time exponent and showed very good corrosion resistance compared to the T22 steel. In both steels, the oxide layer mainly formed a Fe-rich oxide layer composed of hematite (Fe2O3), magnetite (Fe3O4), and spinel (FeCr2O4). Sulfide segregation occurred in the oxide layer due to SO2 gas. However, the locations of segregation for the T22 and T92 steel were different.

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10해수 유속 변화에 따른 Al5052-O와 Al6061-T6 알루미늄 합금의 침식부식 특성

저자 : 김영복 ( Young-bok Kim ) , 김성종 ( Seong-jong Kim )

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 18권 6호 발행 연도 : 2019 페이지 : pp. 292-299 (8 pages)

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The hull material of a high-speed ship may cause erosion damage from fluid impact. When physical erosion and electrochemical corrosion combine, erosion corrosion damage occurs. The aluminum ship is vulnerable to erosion corrosion because it can be operated at high speed. Thus, in this study, Al5052-O and Al6061-T6 aluminum alloys for the marine environment were selected as experimental materials. The erosion corrosion resistance of Al5052-O and Al6061-T6 aluminum alloys in seawater was investigated by an erosion test and potentiodynamic polarization test at the various flow rate (0 m/s, 5 m/s, 10 m/s, 15 m/s, 20 m/s). Erosion corrosion characteristics were evaluated by surface analysis, 3D analysis, SEM analysis, and the Tafel extrapolation method. The results of surface damage analysis after the erosion test showed that Al6061-T6 presented better erosion resistance than Al5052-O. The results of the potentiodynamic polarization test at the various flow rate, corrosion current density by Tafel extrapolation presented lower values of Al6061-T6 than Al5052-O. Al5052-O showed more surface damage than Al6061-T6 at all flow rates. Consequently, Al6061-T6 presented better erosion corrosion resistance than Al5052-O. The results of this study are valuable data for selecting hull material for an aluminum alloy vessel.

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부산대학교 안동대학교 금오공과대학교 국민대학교 연세대학교
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  • 2 안동대학교 (9건)
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  • 6 중앙대학교(서울) (3건)
  • 7 한국과학기술원(KAIST) (3건)
  • 8 한국항공대학교 (2건)
  • 9 Cornell University (2건)
  • 10 한국생산기술연구원 (2건)

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