- TOP
- Zairyo-to-Kankyo
- Vol. 58 (2009), No. 12
Zairyo-to-Kankyo Vol. 58 (2009), 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)
Keyword Ranking
19 Mar. (Last 30 Days)
Zairyo-to-Kankyo Vol. 58 (2009), No. 12
Effect of Initial Films of Copper on Moundless Type Pitting Corrosion of Copper Tubes
Masahiro Sakai, Osami Seri
pp. 434-440
DOI:
10.3323/jcorr.58.434Abstract
Copper tubes were immersed for one year in fifteen kinds of synthetic freshwater to reproduce a moundless type pitting corrosion. Most or part of the area of some specimen surfaces changed its color into dark brown for about one week immersion. Such a dark brown area formed in freshwater for about one week immersion is called “initial film” of a copper. The formation of the initial film was accelerated in the test water containing a chloride ion. After one-year immersion tests, moundless type pitting corrosion occurred on the specimen immersed in the test water containing 40 mg SiO2/L, 50 mg SO42−/L, 10 mg Cl−/L and 10 mg HCO3−/L. These pits were located on the boundary of the initial film. The initial film was formed intentionally by one-week immersion in the solution containing silica and chloride ion. Cathodic reductions of the initial film revealed that the thickness of the initial film was about 400 nm of cuprous oxide. The galvanic corrosion test was performed using galvanic couples of a copper tube with the initial film and an as-received copper tube. The galvanic current flew from the copper tube with initial film to the as-received copper tube. This result indicates that the macro-cell formation of the area with an initial film and the area without an initial film causes the moundless type pits on the boundary of the initial film.
Development of a New Design for Corrosion Prevention in NH4HS Environments
Kazuhiro Toba, Koji Kawano, Jun'ichi Sakai
pp. 441-447
DOI:
10.3323/jcorr.58.441Abstract
NH4HS corrosion has been a serious problem in oil refining plants. The corrosion rate dramatically increases over a certain concentration of NH4HS. In high pressure plants such as hydrodesulfurization units which are operating in NH4HS environments, leakage caused by corrosion could result in catastrophic disaster. Therefore, in the design phase, corrosion prevention techniques should be considered. In this study, a new design philosophy to prevent NH4HS corrosion in a sour water environment was successfully developed based on simulation techniques.
Article Access Ranking
19 Mar. (Last 30 Days)
-
Effects of the Addition of Alloying Elements on Hydrogen Diffusion and Hydrogen Embrittlement in Martensitic Steel
ISIJ International Vol.64(2024), No.4
-
Effects of Alloying Element on Bainitic Transformation in Fe-0.3N Alloy
ISIJ International Vol.64(2024), No.5
-
Quantification of Changes in Lattice Defect Density in BCC Iron during Plastic Deformation Using Electrical Resistivity Measurements
ISIJ International Vol.64(2024), No.5
-
The Crystal Structure of As-quenched Fe–C Martensite
ISIJ International Vol.64(2024), No.2
-
Liquid-Liquid Phase Separation and Phase Distribution in CaO-P2O5-FeO Slag for Phosphorus Recovery
ISIJ International Advance Publication
-
Effect of biocarbon addition on metallurgical properties of mill scale-based auger pressing briquettes
ISIJ International Advance Publication
-
Preface to the Special Issue on “New Developments in Elucidation of Hydrogen Embrittlement Phenomena from the Incubation Stage to Fracture”
ISIJ International Vol.64(2024), No.4
-
Hydrogen trapping and precipitation of alloy carbides in molybdenum added steels and vanadium added steels
ISIJ International Advance Publication
-
Effect of Submerged Entry Nozzle Structure on Fluid Flow, Slag Entrainment, and Solidification Process in a Slab Continuous Casting Mold
ISIJ International Advance Publication
-
Effect of P Addition on the Corrosion Resistance of Steels Before and After Rust Formation
Tetsu-to-Hagané Advance Publication
You can use this feature after you logged into the site.
Please click the button below.