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. 69 (2020), No. 2

  • The Mystery of Corrosion Protection

    pp. 29-30

    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.69.29

  • The pH in Crevice Measured by a Semiconductor Chemical Sensor and Relationship with Crevice Corrosion Behavior of Stainless Steel

    pp. 40-48

    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.69.40

    In order to clarify the relationship between crevice corrosion behavior of SUS304 and the pH in crevice(pHc), simultaneous measurement of pH in crevice by semiconductor chemical sensor at potentiostatic polarization.The pH measured by the sensor is not influenced by the metal ion and shows the value reflecting[ H] and γH.When crevice corrosion is always progressing by potentiostatic polarization, among the metal ions dissolved in the crevice, mainly in the hydrolysis reaction of Cr3+ or formation of chloride complex ions, the entire crevice part becomes extremely low pH environment with pHc<0.0.On the other hand, when polarization by two-step potentiostatic polarization, the amount of metal dissolved in the crevice decreases depending on the second potential(E2), and finally, eventually leading to re-passivation.In the case of this study, the re-passivation pH after crevice corrosion progression was 2.5 to 3, and the repassivation potential was about 80 mV, which gave high engineering significance.
  • The Effect Of Chloride Ion and Dissolved Oxygen Concentration On Passivation pH of SUS304 Stainless Steel

    pp. 49-57

    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.69.49

    When crevice corrosion of stainless steel occurs and progresses, the proton and the chloride ion concentration is high and there is no dissolved oxygen in the crevice. On the other hand, when crevice corrosion of stainless steel stops, the proton and the chloride ion diffuses out of the crevice and dissolved oxygen penetrates the inside of the crevice. In this case, the state of the stainless steel changes from active state to passive state.Since it is important to know the passivation behavior of the stainless steel, we invest the effect of chloride ion and dissolved oxygen concentration on passivation pH of SUS304 stainless steel.The passivation pH of SUS304 steel increased with increasing chloride ion concentration and decreasing dissolved oxygen. When cathodic current density exceeds ICRIT, passivation occurs.Therefore, It is assumed that the rise of ICRIT and the decrease of cathodic current density of the proton reduction with the rise of chloride ion concentration and the decrease of cathodic current density of the oxygen reduction with the decrease of dissolved oxygen concentration contributes to increasing passivation pH.

Article Access Ranking

06 May. (Last 30 Days)

  1. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  2. Steam Reforming of Methane on Sponge Iron: Influence of Gas Composition on Reaction Rate ISIJ International Vol.61(2020), No.1
  3. Preface to the Special Issue on “Toward Suppression of Hydrogen Absorption and Hydrogen Embrittlement for Steels” ISIJ International Vol.61(2021), No.4
  4. Automatic Ultrasonic Testing of Non-metallic Inclusions Detectable with Size of Several Tens of Micrometers Using a Double Probe Technique along the Longitudinal Axis of a Small-diameter Bar ISIJ International Vol.61(2020), No.1
  5. Three-dimensional Investigations of Non-metallic Inclusions in Stainless Steels before and after Machining ISIJ International Advance Publication
  6. Rapid Method to Measure Hydrogen Diffusion Coefficient in Metal Using a Multi-sine Wave Signal ISIJ International Vol.61(2021), No.4
  7. Review of Positron Lifetime Studies of Lattice Defects Formed during Tensile Deformation in a Hydrogen Environment ISIJ International Vol.61(2021), No.4
  8. Method for Evaluating Hydrogen Embrittlement of High-Strength Steel Sheets Considering Press Formation and Hydrogen Existence State in Steel ISIJ International Vol.61(2021), No.4
  9. Decarburizing Behavior and Its Effect on Mechanical Properties of Ultrahigh Strength Steel Sheets ISIJ International Vol.61(2021), No.4
  10. Effects of Alloying Elements on Hydrogen Diffusion in Iron ISIJ International Vol.61(2021), No.4

Search Phrase Ranking

06 May. (Last 30 Days)

  1. blast furnace
  2. blast furnace permeability
  3. coke oven gas injection
  4. ultrasonic inclusion
  5. blast furnace productivity
  6. continuous casting of electrical steel
  7. slag
  8. activities in the liquid solution sio2-cao- mgo-al2o3 at 1600℃
  9. activity coefficient of ti in liquid iron
  10. cokes gasification