Zairyo-to-Kankyo
New Arrival Alert : OFF

You can use this feature after you logged into the site.
Please click the button below.

Log in / Sign up
ONLINE ISSN: 1881-9664
PRINT ISSN: 0917-0480

Zairyo-to-Kankyo Vol. 60 (2011), No. 11

  • Expectations for Future Study on Corrosion Protection

    pp. 469-469

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.60.469

  • Hydrogen Entry into Steel in Ammonium Thiocyanate Solution

    pp. 476-478

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.60.476

    The hydrogen absorption process for conducting hydrogen embrittlement tests is either immersion in a solution of ammonium thiocyanate or electrochemical reaction. Hydrogen entry into steel was measured to investigate these hydrogen absorption processes by using an electrochemical method. The hydrogen entry into steel caused by an electrochemical reaction in an alkali solution is at the same level of that caused by immersion in an ammonium thiocyanate solution. The electrochemical reaction in an alkali solution enables steel to absorb hydrogen without changing the steel surface condition.
  • Delyed Failure of High-Tensile-Strength Steels under Anodic Potential in Water

    pp. 479-482

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.60.479

    A ring which was part of high-pressure equipment, made from medium carbon 4.5% Cr tool steel with a tensile strength of 2100 MPa was fractured after short-term operation in water. The equipment was used for synthesizing a hard substance, and the ring was anodically polarized at 3 V during the operation. The anodic polarization of the failed ring was attributed to the 6 V DC current applied to the equipment for supplying reaction heat. The surface of the failed ring in water became the anode of the 3 V cell. Delayed fracture tests in water were conducted using bent-beam specimens without notches to investigate the effects of anodic polarization on fracture susceptibility. We confirmed that the fracture time under 3 V was shorter than that at natural potential, showing good agreement with the actual fracture time of the ring. Therefore, we recommended that the surface of the ring be protected from water with a plastic film to prevent the occurence of delayed fracture due to anodic polarization.
  • Corrosion of a Stainless Steel by Aerobic Microorganisms in Waste Water Treatment Facilities

    pp. 483-486

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.60.483

    In activated sludge treatment facilities, the waste water is purified by microbial metabolic processes.
    In order to understand the corrosion of SUS304 stainless steels in this facilities, investigation by microbial analysis and electrochemical measurements was conducted.
    Aerobic bacteria were detected in corroded weld parts. Open circuit potentials (Eoc) of corroded facilities were more noble than that of the stainless steel in controlled waste water and that of no corrosion facilities. Repassivation potentials for crevice corrosion (ER,CREV) of the SUS304 stainless steel were measured in the laboratory and a Eoc > ER,CREV relation was confirmed.
    It was considered that the cause of the corrosion was the increase of the potential of SUS304 stainless steels by microorganisms action and a formation of crevice by biofilm.
  • Performance and Effect by Temperature of Aluminum Panel Anodes on the Cathodic Protection of Concrete Railway Bridge

    pp. 487-490

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.60.487

    It is attracted that cathodic protection method (CP) is effective in the remedy of rusted rebars, regardless of amount of salt in concrete. The aluminum galvanic anode is one of CP. Rebar potential, current density and temperature were measured at concrete rail way bridge with aluminum panel. Analysis and discussion were given to the effect by temperature shift for rebars potential, neither incident affected for depolarization by it. And, measuring time with off potential for measuring of depolarization was appropriate time.
  • Case Analysis of Stainless Steel Corrosion in Hot Spring Waters and Using Titanium as a Measure against Corrosion

    pp. 491-496

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.60.491

    In hot spring facilities in Kusatsu, Gunma Prefecture, in about two months, SUS304 stainless steel handrails corroded and dissolved uniformly in acid sulfate-chloride spring water containing hydrogen sulfide. Corroded samples were analyzed, remaining handrails were observed closely, an immersion test was conducted at the sources of springs, and corrosion potentials were measured. The result showed that the causes of the corrosion were low pH (pH 2 or less) and the corrosion action of free hydrogen sulfide. Because the handrails corroded in only the type of spring water containing hydrogen sulfide at the two sources of springs with a pH of 2 or less, hydrogen sulfide had a particularly significant impact on the corrosion and accelerated the active dissolution of SUS304 stainless steel. As a measure against corrosion, titanium instead of SUS304 stainless steel was used for handrails. Rusting or local corrosion was not observed about 18 months after use.
  • Prediction Method for Mean Corrosion Depth of Uncoated Carbon Steel Plate Subjected to Rainfall Effect using Fe/Ag Galvanic Couple ACM-Type Corrosion Sensor

    pp. 497-503

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.60.497

    To ensure the safety of steel structures that can exhibit fatal damage due to corrosion, it is important to quantitatively clarify the corrosion environment in each member and to evaluate the time-dependent corrosion behavior. The purpose of this research is to propose a method for predicting the time-dependent mean corrosion depth of uncoated structural steel plates subjected to rainfall effect, using an ACM type corrosion sensor consisting of a Fe/Ag galvanic couple. Atmospheric exposure tests were carried out on the uncoated steel plates. In addition, the corrosion environments of the skyward- and groundward-facing surfaces of the specimens were monitored using ACM sensors to evaluate the quantitative relationship between the corrosivity of the atmospheric environments and the mean corrosion depth.

Article Access Ranking

15 Jul. (Last 30 Days)

  1. Production and Technology of Iron and Steel in Japan during 2019 ISIJ International Vol.60(2020), No.6
  2. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  3. Scheduling in Continuous Steelmaking Casting: A Systematic Review ISIJ International Vol.60(2020), No.6
  4. Numerical Simulation of Fluid Flow and Solidification in a Vertical Round Bloom Caster Using a Four-port SEN with Mold and Strand Electromagnetic Stirring ISIJ International Advance Publication
  5. Numerical Simulation for the Influence of EMS Position on Fluid Flow and Inclusion Removal in a Slab Continuous Casting Mold ISIJ International Vol.60(2020), No.6
  6. Experimental Evaluation of Texture Change during Grain Growth in Electrical Steel Sheets and Its Prediction by Phase Field Simulation Tetsu-to-Hagané Vol.106(2020), No.7
  7. From Iron Ore to Crude Steel: Mass Flows Associated with Lump, Pellet, Sinter and Scrap Iron Inputs ISIJ International Vol.60(2020), No.6
  8. Tension Leveling Using Finite Element Analysis with Different Constitutive Relations ISIJ International Vol.60(2020), No.6
  9. Deoxidation Equilibria of Fe–Mn–Al Melt with Al2O3 or MnAl2O4 at 1873 and 1773 K ISIJ International Advance Publication
  10. Taguchi Orthogonal Test on Granule Properties and Porosity Distribution in Sintering Bed using High-resolution X-ray Computed Tomography ISIJ International Vol.60(2020), No.6

Search Phrase Ranking

15 Jul. (Last 30 Days)

  1. blast furnace
  2. blast furnace permeability
  3. blast furnace productivity
  4. cao sio2 viscosity
  5. 17-7 ph
  6. hole expansion ratio
  7. big data
  8. cao
  9. cold formed bainitic steel
  10. digitalization