Corrosion Science and Technology

Corrosion failure analysis of the flow plate, which is one of the accessories of the plate heat exchanger in a district heating system, was performed. The flow plate is made of 316 stainless steel, and water at different temperatures in the flow plate exchanges heat in a non-contact manner. The flow plate samples in which water mixing issues occurred were collected. Corrosion-induced pits, oxides, and contaminants were observed at locations where two plates are regularly in contact. The EDS analysis of the surface oxides and contaminants revealed that they were composed of carbon, silicon, and magnesium, which came from chemical adhesives. The IC/ICP analyses showed that the concentration of chloride ions was 30 ~ 40 ppm, which was not sufficient to cause corrosion of stainless steel. In the crevice, a local decrease in dissolved oxygen occurs along with an increase in chloride ions, thus forming an acidic environment. These environments destroyed the passive film of stainless steel, resulting in pits. Moreover, contaminants formed a narrower gap between the two metal plates and inhibited the diffusion of ions, thereby accelerating crevice corrosion.

송민지 ( Min Ji Song )

최가현 ( Gahyun Choi )

채호병 ( Hobyung Chae )

김우철 ( Woo Cheol Kim )

김희산 ( Heesan Kim )

김정구 ( Jung-gu Kim )

이수열 ( Soo Yeol Lee )

판형 열교환기 전열판의 부식 파손 분석

板式换热器换热板腐蚀损伤分析

To improve corrosion resistance and reduce the hydrogen uptake of 22MnB5, up to 5% Mg was added to the AlSi coating of 22MnB5. After hot-stamping and electrocoating were done on the metallic-coated specimen, the surface characteristics of the steel, hydrogen uptake content, and corrosion resistance were examined by transmittance electron microscopy, thermal desorption spectrometry, cyclic corrosion testing, and electrochemical impedance spectroscopy. Mg was investigated as MgO on the surface layer after hotstamping while it existed as Mg2Si before hot-stamping. The total hydrogen content of 22MnB5 was decreased along with the Mg content. However, there was no difference at 0.2 wt% or more. When a small amount of Mg was added, the coating corrosion resistance was decreased, but when it was added at around 1.0 wt%, the greatest corrosion resistance increase was seen. However, when 3 wt% or more was added excessively, the corrosion resistance was decreased. MgO on the surface was considered to suppress H uptake by the AlSi melting solution and increase the barrier effect of the coating.

양원석 ( Wonseog Yang )

이재민 ( Jeamin Lee )

김창규 ( Changkyu Kim )

안승호 ( Seungho Ahn )

Homero Castaneda

자동차용 핫스탬핑 AlSi 도금중 Mg 첨가효과

汽车用热冲压AlSi镀层中Mg添加效果

Jin-seong Park

Duck Bin Yun

Hwan Goo Seong

Sung Jin Kim

박진성

윤덕빈

성환구

김성진

Effect of ε-carbide (Fe 2.4 C) on Corrosion and Hydrogen Diffusion Behaviors of Automotive Ultrahigh-Strength Steel Sheet, 초고강도급 자동차용 강재 내 ε-carbide (Fe 2.4 C)가 부식 및 수소확산거동에 미치는 영향

ε-碳化物(Fe 2.4 C)对汽车超高强度钢板腐蚀和氢扩散行为的影响

Ho-Seong Heo

Seong-Jong Kim

허호성

김성종

Electrochemical Corrosion Damage Characteristics of Austenite Stainless Steel and Nickel Alloy with Various Seawater Concentrations, 오스테나이트계 스테인리스강과 니켈합금의 해수 농도 변화에 따른 전기화학적 부식 손상 특성

奥氏体不锈钢和镍合金在不同海水浓度下的电化学腐蚀损伤特性

A technology for designing and licensing a dedicated radiation shielding facility needs to be developed for safe and efficient operation an R&D center. Technology development is important for smooth operation of such facilities. Causes of damage to internal structures (such as baffle former bolt (BFB) of pressurized water reactor) of a nuclear power reactor should be analyzed along with prevention and countermeasures for similar cases of other plants. It is important to develop technologies that can comprehensively analyze various characteristics of internal structures of long term operated reactors. In high-temperature, high-pressure operating environment of nuclear power plants, cases of BFB cracks caused by irradiated assisted stress corrosion cracks (IASCC) have been reported overseas. The integrity of a reactor’s internal structure has emerged as an important issue. Identifying the cause of the defect is requested by the Korean regulatory agency. It is also important to secure a foundation for testing technology to demonstrate the operating environment for medium-level irradiated testing materials. The demonstration testing facility can be used for research on material utilization of the plant, which might have highest fluence on the internal structure of a reactor globally.

Seong Sik Hwang

Sung Woo Kim

Min Jae Choi

Sung Hwan Cho

Dong Jin Kim

Failure Evaluation Plan of a Reactor Internal Components of a Decommissioned Plant

退役电厂反应堆内部组件失效评估计划

Chan-Young Lee

Application of High Performance Coatings for Service Life Extension of Steel Bridge Coatings

高性能涂层在钢桥涂层使用寿命延长中的应用

To safely operate domestic nuclear power plants approaching the end of their design life, the material degradation management strategy of the components is important. Among studies conducted to improve the soundness of nuclear reactor components, research methods for understanding the degradation of reactor internals and preparing management strategies were surveyed. Since the IGSCC (Intergranular Stress Corrosion Cracking) initiation and propagation process is associated with metal dissolution at the crack tip, crack initiation sensitivity was decreased in the hydrogenated water with decreased crack sensitivity but occurrence of small surface cracks increased. A stress of 50 to 55% of the yield strength of the irradiated materials was required to cause IASCC (Irradiation Assisted Stress Corrosion Cracking) failure at the end of the reactor operating life. In the threshold-stress analysis, IASCC cracks were not expected to occur until the end of life at a stress of less than 62% of the investigated yield strength, and the IASCC critical dose was determined to be 4 dpa (Displacement Per Atom). The stainless steel surface oxide was composed of an internal Cr-rich spinel oxide and an external Fe and Ni-rich oxide, regardless of the dose and applied strain level.

황성식 ( Seong Sik Hwang )

최민재 ( Min Jae Choi )

김성우 ( Sung Woo Kim )

김동진 ( Dong Jin Kim )

원자로 내부구조물 균열개시 민감도에 미치는 영향인자 고찰

反应堆内部结构物裂纹起始敏感性影响因素研究

短名
Journal Impact	0.71
国际分区	ELECTROCHEMISTRY(Q4)

涉及主题	材料科学冶金化学有机化学复合材料腐蚀物理工程类量子力学物理化学热力学合金生物电极纳米技术地质学电化学机械工程
出版信息	出版商: Corrosion Science Society of Korea，出版周期: ，期刊类型: journal，开源期刊: 否
基本数据	创刊年份: 2019，原创研究文献占比: 95.00%，自引率:37.50%， Gold OA占比: 0.00%

Corrosion Science and Technology

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판형 열교환기 전열판의 부식 파손 분석

자동차용 핫스탬핑 AlSi 도금중 Mg 첨가효과

판형 열교환기 전열판의 부식 파손 분석

자동차용 핫스탬핑 AlSi 도금중 Mg 첨가효과

판형 열교환기 전열판의 부식 파손 분석

Effect of ε-carbide (Fe 2.4 C) on Corrosion and Hydrogen Diffusion Behaviors of Automotive Ultrahigh-Strength Steel Sheet, 초고강도급 자동차용 강재 내 ε-carbide (Fe 2.4 C)가 부식 및 수소확산거동에 미치는 영향

Electrochemical Corrosion Damage Characteristics of Austenite Stainless Steel and Nickel Alloy with Various Seawater Concentrations, 오스테나이트계 스테인리스강과 니켈합금의 해수 농도 변화에 따른 전기화학적 부식 손상 특성

Failure Evaluation Plan of a Reactor Internal Components of a Decommissioned Plant

Application of High Performance Coatings for Service Life Extension of Steel Bridge Coatings

원자로 내부구조물 균열개시 민감도에 미치는 영향인자 고찰

ISSN	1598-6462, 2288-6524
h-index	8