材料と環境 Vol. 64 (2015), No. 12
Backnumber
-
Vol. 73 (2024)
-
Vol. 72 (2023)
-
Vol. 71 (2022)
-
Vol. 70 (2021)
-
Vol. 69 (2020)
-
Vol. 68 (2019)
-
Vol. 67 (2018)
-
Vol. 66 (2017)
-
Vol. 65 (2016)
-
Vol. 64 (2015)
-
Vol. 63 (2014)
-
Vol. 62 (2013)
-
Vol. 61 (2012)
-
Vol. 60 (2011)
-
Vol. 59 (2010)
-
Vol. 58 (2009)
-
Vol. 57 (2008)
-
Vol. 56 (2007)
-
Vol. 55 (2006)
-
Vol. 54 (2005)
-
Vol. 53 (2004)
-
Vol. 52 (2003)
-
Vol. 51 (2002)
-
Vol. 50 (2001)
-
Vol. 49 (2000)
-
Vol. 48 (1999)
-
Vol. 47 (1998)
-
Vol. 46 (1997)
-
Vol. 45 (1996)
-
Vol. 44 (1995)
-
Vol. 43 (1994)
-
Vol. 42 (1993)
-
Vol. 41 (1992)
-
Vol. 40 (1991)
キーワードランキング
03 Dec. (Last 30 Days)
材料と環境 Vol. 64 (2015), No. 12
化学プラントにおける材料損傷データへの統計解析適用と現場活用
栗原 朋之
pp. 519-524
DOI:
10.3323/jcorr.64.519抄録
The collection of the actual damage data and statistical analysis are introduced by some case studies in order to apply them to the practical maintenance in chemical plant. In the case of the radiation tube with oxidation, the inspection data were grouped by the actual damaged condition and the life prediction by the statistical analysis was conducted. From the result, the replace plan was clarified.
In two case studies on external corrosion, the corrosion data and associated information were collected from the actual plant and statistical analysis was conducted. From the result, the acceleration factors of the external corrosion were quantitatively clarified by the distribution of the corrosion rate. Based on the results, the technical module was developed. And in actual plant, the inspection was planned and carried out.
From these case studies, it is recognized that understanding the characteristics of the degradation is important for the statistical analysis of damage data.
土壌微生物群集によって誘引される炭素鋼腐食とそのメカニズムの解析
平野 伸一, 長岡 亨, 伊勢 孝太郎, 天野 由記, 松本 伯夫
pp. 535-539
DOI:
10.3323/jcorr.64.535抄録
To obtain the knowledge about the corrosion ability and its mechanism as a target the soil environment microorganisms, lake mud was cultured with metallic iron. As a result, corrosion of carbon steel was observed with sulfate reduction and methane producing activity in brackish medium with lactate as substrate. The next-generation sequencing technologies revealed microbial community varies greatly between environmental samples (inoculated sample) and cultured sample. Particularly, Desulfovibrio species and Clostridia class, that sulfate reducing ability have been reported, became dominant. Inhibition test of sulfate reducing bacteria and methane producing archaea suggested that sulfate reducing bacteria plays a major role for this corrosion, and methane producing archaea enhanced corrosion activity by the coexistence of sulfate reducing bacteria.
石油タンク底水を用いた腐食再現試験の次世代シーケンサによる微生物群集構造解析
若井 暁, 藤井 創太郎, 政成 美沙, 宮永 一彦, 丹治 保典, 三本木 至宏
pp. 540-544
DOI:
10.3323/jcorr.64.540抄録
Involvement of microorganisms to corrosion refers to microbiological influenced corrosion( MIC). We have previously succeeded a lab-scale corrosion test using bottom water from oil-storage tanks and shown microbial community change after the corrosion by a denaturing gradient gel electrophoresis analysis. However, those community structures have not yet been correlated to the accelerated corrosion. Therefore, we further conducted analysis of microbial community for by pyrosequencing using a next-generation sequencer. In the corrosion sample, an acetic acid bacterium Acetobacterium sp. and a sulfate-reducing bacterium Desulfovibrio sp. were enriched. In contrast, only Desulfovibrio sp. bacterium was enriched in the non-corroded culture, and Acetobacterium sp. bacterium was not observed. These results indicate that the Acetobacterium sp. bacterium may involve in the accelerated corrosion. This is first report of the corrosion by the Acetobacterium sp. bacterium. The combination of a lab-scale corrosion test and microbial community analysis by pyrosequencing would be useful to correlate between corrosion behavior and microbial community change. In future, such investigation would contribute to the understanding for the microbiologically influenced corrosion.
Protection of Iron against Corrosion in Various Solutions by Coverage of Passivated Iron with a Two-Dimensional Polymer Coating Prepared by Using Octyltriethoxysilane and Healing Treatment in 0.1 M NaNO3
Tadashi Shimura, Kunitsugu Aramaki
pp. 545-551
DOI:
10.3323/jcorr.64.545抄録
In order to shorten the time required for preparation of an ultrathin polymer coating on a passivated Fe electrode, a self-assembled monolayer of 16-hydroxyhexadecanoate ion HO(CH2)15CO2- adsorbed on the electrode was modified with 1,2-bi(striethoxysilyl)ethane(C2H5O)3Si(CH2)2Si(OC2H5)3 and octyltriethoxysilane C8H17Si(OC2H5)3. Further, the passivated and polymer-coated electrode was healed by treatment in 0.1 M NaNO3. The time for passive film breakdown, tbd and the protective efficiency, P (%) were determined by monitoring the open-circuit potential and repeated polarization measurements during immersion in 0.1 M KClO4, 0.1 M NaNO3, 0.1 M Na2SO4 and 0.1 M NaCl for many hours. The tbd values were 57.4, >240, 19.2 and 9.0 h, respectively. Breakdown of the passive film was markedly suppressed by coverage with the polymer coating and healing treatment. The P values of the electrode in these solutions were extremely high, more than 99.9% before tbd, indicating that complete protection of substrate Fe against corrosion was accomplished by covering the electrode with the healed passive film and polymer coating unless the passive film was broken down.
ステンレス鋼の溶接ヒートティント部の局所電気化学挙動
河野 崇史, 石井 知洋, 梶山 浩志, 木村 光男, 伏見 公志
pp. 552-557
DOI:
10.3323/jcorr.64.552抄録
Deterioration mechanism of corrosion resistance at heat-tinted zone of stainless steel weldment was studied. Local electrochemical measurements with micro capillary cell and surface analyses at small regions were conducted to correlate local variation in corrosion behavior and surface structure. Depletion of the Cr content at the substrate surface and formation of an Fe rich oxide layer on the surface were confirmed, although their distances from the welding bead were not identical. It was also revealed that the corrosion behaviors at the area with the Cr depletion and the area with the Fe rich oxide layer were different. The Cr depletion led to lowering of pitting potential due to the activation of substrate steel whereas the Fe rich oxide layer led to preferential rusting in the cyclic corrosion test due to deterioration of the surface protective layer.
論文アクセスランキング
03 Dec. (Last 30 Days)
-
-
-
-
凝固過程における溶鋼中からAl2O3上へのMnSの晶出挙動
鉄と鋼 早期公開
-
-
Molecular dynamics simulation of viscosity of the CaO, MgO and Al2O3 melts
ISIJ International 早期公開
-
One-Pot Sonochemical Synthesis of Carbon Nano-Onions from Silicon Carbide in Pure Water
MATERIALS TRANSACTIONS Vol.65(2024), No.11
-
Terminal Settling Velocity of Particle in Suspension
ISIJ International 早期公開
-
Reduction and Carburization Behaviors of Iron Oxide Composite with Iron Carbide and Free Carbon
ISIJ International 早期公開
-
Development of a Low-carbon Sintering Process Technology and Its Application to a Pilot-scale Sintering Testing
ISIJ International Vol.64(2024), No.13
この機能はログイン後に利用できます。
下のボタンをクリックしてください。