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Page : 20 - 33
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- 산업계 ? 연구소 동향
- 부식과 방식 새소식
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Page : 34 - 46
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- 부식방식기술 관련 특허 정보
- 부식과 방식 새소식
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Page : 47 - 52
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- 교육 개최 소식
- 부식 및 방식 표준 교육(2015년도 부식방식 강습회)
영국 ICorr 초빙교육 개최[Corr 절연코팅검사원/ICorr 방화코팅검사원 인증교육과정]
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Page : 53 - 69
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- 2015년도 춘계학술대회
- 2015년도 춘계학술대회 및 시뮬레이션&조선해양플랜트 심포지엄 개최보고서
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Page : 70 - 85
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- 2015년도 추계학술대회
- 2015년도 추계학술대회 및 도장방식 심포지엄 개최보고서
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Page : 86 - 90
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- 제45회기(2015년도) 정기총회 회의자료
- 학회 소식
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Page : 43 - 53
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- Investigation of the Biodegradable Mechanism of Pure Magnesium Using Electrochemical Impedance Spectroscopy Technique
- In this study, electrochemical impedance spectroscopy (EIS) was used to examine the changes in the electrochemical properties of biodegradable pure magnesium implanted into Sprague-Dawley rats for three days. The in vivo test results were compared with those of the in vitro tests carried out in Hank\\\'s, dilute saline and simulated body fluid (SBF) solutions. The in vitro corrosion rates were 20~1700 fold higher, as compared to the in vivo corrosion rates. This discrepancy is caused by biomolecule adsorption on the surface, which prevents the transport of water into the magnesium surface on in vivo testing. Among the in vitro experimental conditions, the corrosion rate in SBF solution had the least difference from the in vivo implanted specimen.
- KEYWORDs : biomaterials, magnesium, implantation, corrosion, scanning electron microscopy (SEM)
- AUTHORs : Woo-Cheol Kim, Seon-Hong Kim, Jung-Gu Kim†, and Young-Yul Kim
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Page : 54 - 57
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- Biodegradation of Secondary Phase Particles in Magnesium Alloys:A Critical Review
- Magnesium alloys have been extensively studied in recent years for potential biodegradable implant applications. A great deal of work has been done on the evaluation of the corrosion behaviour of magnesium alloys under in vitro and in vivo conditions. However, magnesium alloys, in general, contain secondary phase
particles distributed in the matrix and/or along the grain boundaries. Owing to their difference in chemistry in comparison with magnesium matrix, these particles may exhibit different corrosion behaviour. It is essential to understand the corrosion behaviour of secondary phase particles in magnesium alloys in physiological
conditions for implant applications. This paper critically reviews the biodegradation behaviour of secondary phase particles in magnesium alloys. - KEYWORDs : magnesium alloys, biomaterial, corrosion, secondary phase particles, galvanic corrosion
- AUTHORs : M. Bobby Kannan†
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Page : 58 - 68
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- Relationship between the Applied Torque and CCT to obtain the Same Corrosion Resistance for the Plate and Cylindrical Shape Stainless Steels
- Many industries need the universal standard or technique to obtain the identical CCT regardless of specimen geometries. This study aimed to determine an appropriate applied torque to the cylindrical specimen defining the apparatus and the procedure to measure the temperature of initiating crevice corrosion in tubular shape
products such as pipes, tubes and round rods etc; the test method also proved applicable to the plate type specimen. A series of experiments for CCT easurements with the plate type and cylindrical stainless steel specimens of various diameters with different microstructures (austenitic and duplex) and PRENs were conducted
to determine the relationship among geometries on CCT. Thus, the apparatus that could measure the CCT of stainless steels with both plate and cylindrical geometries was newly designed. The use of the apparatus facilitated the same CCT value for both geometries only if the specimens were made of the same alloy.
The applied torque can be calculated for various diameters of the cylindrical specimens using the following relation; Applied torque, Nm = -0.0012D2 + 0.019D + 2.4463 (D; the diameter of cylindrical specimen, mm). However, upwards of 35 mm diameter cylindrical specimens require 1.58Nm, which is the same
torque for the plate type specimen; in addition, this test method cannot be used for cylindrical specimens of less than 15 mm diameter. - KEYWORDs : stainless steel, crevice corrosion temperature (CCT), pitting resistance equivalent number (PREN), applied torque, plate, cylindrical shape
- AUTHORs : Hyun Young Chang, Ki Tae Kim, Nam In Kim, and Young Sik Kim†
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Page : 69 - 77
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- Corrosion Protection Performance of Polyester-Melamine Coating with Natural Wood Fiber Using EIS Analysis
- In the present study, polyester-melamine coating systems with natural wood fiber (NWF) were prepared and the effects of NWF on the corrosion protectiveness of the polyester-melamine coating were examined using EIS analysis. From the results, higher average surface roughness was observed with increase of NWF content. Water diffusivity and water uptake into the polyester-melamine coatings with NWF were much higher than that into the pure polyester-melamine coating. The decrease in the impedance modulus |Z| was associated with the localized corrosion on carbon steel, confirming that corrosion protection of the polyester-melamine coatings with NWF well agrees with its water transport behavior.
- KEYWORDs : polyester, corrosion protection, EIS, wood fiber, confocal microscopy
- AUTHORs : PyongHwa Shin, DuHwan Jo, and MinYoung Shon†
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