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Initial Corrosion Behavior of Galvanized Steels in Atmospheric Environment
Ayumu Yokota,Youhei Hirohata,Kazuhiko Noda,Hideki Katayama,Hiroyuki Masuda 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
The corrosion prevention mechanism of Zn/Fe galvanic couple changes with time and have been investigated by atmospheric exposure tests and surface potential distribution measurement. The samples used in experiment were non-chromate treated galvanized steel and chromate treated galvanized steel. Corrosion products were observed on the surface of non-chromate treated galvanized steel after atmospheric exposure tests. On the other hand, the corrosion products were not observed on the surface of chromate treated galvanized steels. The experimental results show that chromate conversion treatments increase corrosion resistance of the galvanized steel. The sacrificial anodic reaction in non-chromate treated galvanized steels was seen at the Zn/Fe boundary. However, the effect of corrosion prevention by the sacrificial anodic reaction was less seen on chromate treated galvanized steels. From these results, chromate conversion treatments increase the corrosion resistance of the coatings, while decreasing the effect of sacrificial anodic reaction at the Zn/Fe boundary. The expansion of sacrificial anodic reaction was confirmed by surface potential distribution measurement due to the corrosion product at the Zn/Fe boundary.
Ayumu Yokota,Kazuhiro Sekita,Tomiharu Hirano,Kazuhiko Noda 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
The corrosion prevention mechanism and end corrosion of the galvanized steels have been investigated. The atmospheric exposure tests were carried out for the observation of corrosion process on the specimen surface under the seashore environment for one and half years. From the results of the exposure tests, it was indicated that the galvanized steel was protected by the corrosion product of Zn under the atmospheric environment. The anodic polarization curve measurements were carried out for the exploration of the anodic polarization behavior under the neutral solution. According to the results in the anodic polarization curves of the galvanized steels, the anodic current density of the edge part was larger than that of the surface part.
Reaction Evaluation of Metal Surface Using Surface Potential Distribution Measurement
Youhei Hirohata,Ayumu Yokota,Kazuhiko Noda,Hideki Katayama,Hiroyuki Masuda 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
A surface potential measurement device with non-contact probe is applied to measure the potential of the passive metals. The surface potential distribution of high corrosion resistance materials shows difference behavior between titanium and type 304 stainless steel. From these results, the measurement of the surface potential using a surface potential measurement device is quite suitable to investigate the atmospheric corrosion behavior of high corrosion resistance materials.
Atmospheric Corrosion Behavior of the Pure Zirconium
Ayami Kameda,Yuki Kagawa,Ayumu Yokota,Youhei Hirohata,Kazuhiko Noda 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
The zircalloy improved the corrosion resistance and the materials strength, largely is used for a fuel aggregate member, a pressure pipe, and the fuel coating pipes of the nuclear reactor. The estimation of the reaction characteristics of pure zirconium is important in order to investigate the application in actual using. The pure zirconium was examined by the polarization curves measurement in solution environment and the surface potential distribution measurement to evaluate the stability of the passive film on zirconium as the fundamental data. A surface potential measurement device with non-contact probe is applied to measure the potential of the pure zirconium. The corrosion behavior of the pure zirconium surface is also investigated by using the surface potential date. The surface potential distribution of pure zirconium shows a good corrosion resistance in the atmospheric condition.
Megumi Nakai,Michiro Iizuka,Nobuaki Matsui,Kazuko Hosogi,Akiko Imai,Noriaki Abe,Hisashi Shiraishi,Ayumu Hirata,Yusuke Yagi,Kohei Jobu,Junko Yokota,Eishin Kato,Shinya Hosoda,Saburo Yoshioka,Kenichi Har 한국식품영양과학회 2016 Journal of medicinal food Vol.19 No.5
Bangle (Zingiber purpureum) is a tropical ginger that is used as a spice in Southeast Asia. Phenylbutenoid dimers isolated from Bangle have exhibited neurotrophic effects in primary cultured rat cortical neurons and PC12 cells. Furthermore, chronic treatment with phenylbutenoid dimers enhances hippocampal neurogenesis in olfactory bulbectomized mice. In this study, we investigated the effects of Bangle extract on behavior and hippocampal neurogenesis in vivo. SAMP8 mice, which are an established model for accelerated aging, with age-related learning and memory impairments, were given a Bangle-containing diet for 1 month, and subsequent behavioral tests and immunohistochemistry for Ki67, a proliferating cellmarker, were performed. We found that the Bangle-containing diet improved spatial learning and memory deficits in the Morris water maze and significantly increased the numbers of Ki67-positive cells in the dentate gyrus of the SAMP8 mice. In addition, the Bangle extract exhibited a neurotrophin-like activity as indicated by the induction of neurite sprouting in PC12 cells. Our results suggest that Bangle is beneficial for the prevention of age-related progression of cognitive impairment.