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Zairyo-to-Kankyo Vol. 62 (2013), No. 8

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

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Zairyo-to-Kankyo Vol. 62 (2013), No. 8

Influences of Mixing and Porosity Ratios of Porous Sintered Al-Zn Plate and Material Property of Fiber Sheet on Anticorrosive Effects of Sacrificial Anode for Carbon Steel in Atmospheric Environment

Shigenobu Kainuma, Kazuhiro Utsunomiya, Shuji Ishihara, Daisuke Uchida, Akira Kaneko, Takao Yamauchi

pp. 278-288

DOI:

10.3323/jcorr.62.278

Abstract

In authorsʼ previous research, an anticorrosive method with sacrificial anode for steel members in atmospheric environment was proposed. In this method, porous sintered Al-Zn plate was applied as sacrificial anode materials. In addition to this, chemical fiber sheet was applied as the material which has functions of continual water absorption and retention needed for sacrificial anode reaction.
The object of this research is to clarify the influences of mixing and porosity ratios of the sintered plate and property of the fiber sheet on the anticorrosive effects and to investigate applicability of the anticorrosive method in various atmospheric environments. Electro-chemical tests using the sintered plate and material property tests using the fiber sheet were carried out. Moreover, atmospheric exposure tests were also conducted on the model specimens composed of the steel plate, the fiber sheet and the sintered plate. The results showed that the anticorrosive method seems to be applicable in atmospheric environments by controlling the anticorrosive effect and consumption of anode materials by putting various kinds of the sintered plate and the fiber sheet together.

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Influences of Mixing and Porosity Ratios of Porous Sintered Al-Zn Plate and Material Property of Fiber Sheet on Anticorrosive Effects of Sacrificial Anode for Carbon Steel in Atmospheric Environment

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Corrosion Behavior of Prestressing Steel in a Solution of 20％ Ammonium Thiocyanate

Mikiyuki Ichiba, Yuya Niidome, Shunsuke Nakamura, Junʼichi Sakai

pp. 289-293

DOI:

10.3323/jcorr.62.289

Abstract

High-strength steels or PC steel products are used for pre-stressed concrete structures. Testing of PC steel products in terms of hydrogen embrittlement is specified in the FIP Report, and the test method adopted in ISO 15630 is well known. This test is called the FIP test, whereby a constant load is applied to PC steel in a 20％, 50℃ ammonium thiocyanate solution. An investigation was carried out on the corrosion behavior of 1,400 MPa class PC steel products in a FIP testing environment. Under this testing environment, a cathodic reaction associated with oxygen consumption and hydrogen generation was identified from the initial stage of dipping, and corrosive products mainly consisting of ferric sulfide were formed on the surface of a specimen detected in the test pieces. From changes in the amount of gas associated with the reaction, it is understood that, together with this corrosion reaction, there also occurred a reaction involving 1 mol of hydrogen generation or 0.5 mol of oxygen consumption for 1 mol dissolution of iron. It is also assumed that the reaction involving hydrogen generation was a cathodic reaction associated with the decomposition of SCN－.

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Corrosion Behavior of Prestressing Steel in a Solution of 20％ Ammonium Thiocyanate

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