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

ISIJ International
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ONLINE ISSN: 1881-9664
PRINT ISSN: 0917-0480
Publisher: Japan Society of Corrosion Engineering

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

Hydrogen Entry into Steel in Ammonium Thiocyanate Solution

Norihiro Fujimoto, Yasuhiro Higashi, Hiroyuki Saito, Takashi Sawada

pp. 476-478

DOI:

10.3323/jcorr.60.476

Abstract

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.

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Hydrogen Entry into Steel in Ammonium Thiocyanate Solution

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Delyed Failure of High-Tensile-Strength Steels under Anodic Potential in Water

Kenzo Yoshie, Takeshi Onoda

pp. 479-482

DOI:

10.3323/jcorr.60.479

Abstract

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.

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Delyed Failure of High-Tensile-Strength Steels under Anodic Potential in Water

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Corrosion of a Stainless Steel by Aerobic Microorganisms in Waste Water Treatment Facilities

Nobuyasu Shinoda, Toru Shimada

pp. 483-486

DOI:

10.3323/jcorr.60.483

Abstract

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.

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Corrosion of a Stainless Steel by Aerobic Microorganisms in Waste Water Treatment Facilities

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Performance and Effect by Temperature of Aluminum Panel Anodes on the Cathodic Protection of Concrete Railway Bridge

Hitomi Fuda, Yoshio Shinoda, Syunsuke Otani, Yoshinori Matsuda

pp. 487-490

DOI:

10.3323/jcorr.60.487

Abstract

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.

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Performance and Effect by Temperature of Aluminum Panel Anodes on the Cathodic Protection of Concrete Railway Bridge

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Case Analysis of Stainless Steel Corrosion in Hot Spring Waters and Using Titanium as a Measure against Corrosion

Toshihiro Yamate

pp. 491-496

DOI:

10.3323/jcorr.60.491

Abstract

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.

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Case Analysis of Stainless Steel Corrosion in Hot Spring Waters and Using Titanium as a Measure against Corrosion

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Prediction Method for Mean Corrosion Depth of Uncoated Carbon Steel Plate Subjected to Rainfall Effect using Fe/Ag Galvanic Couple ACM-Type Corrosion Sensor

Shigenobu Kainuma, Yuya Yamamoto, Yoshihiro Itoh, Wataru Oshikawa

pp. 497-503

DOI:

10.3323/jcorr.60.497

Abstract

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.

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Prediction Method for Mean Corrosion Depth of Uncoated Carbon Steel Plate Subjected to Rainfall Effect using Fe/Ag Galvanic Couple ACM-Type Corrosion Sensor

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