TY - JOUR
T1 - Corrosion protection of steel members using an Al-Zn base sacrificial anode and fiber sheet in an atmospheric environment
AU - Kainuma, Shigenobu
AU - Yang, Muye
AU - Ishihara, Shuji
AU - Kaneko, Akira
AU - Yamauchi, Takao
N1 - Funding Information:
This research work was kindly supported in part by JSPS KAKENHI Grant Numbers J P19H02227 and JP19K15074 . The authors would like to thank Prof. W. Oshikawa in the University of the Ryukyus, for his kind help concerning the atmospheric exposure tests; and thank Mr. T. Sumitani of Japan Exlan Co., Ltd. for his contributions to the development work about the properties study of fiber sheet in this paper. Authors are also grateful to Y. Tsuchihashi in Shutoko Metropolitan Expressway Co., Ltd. and H. Fujimoto in Metawater Co., Ltd., for providing assistance to the indoor exposure test and atmospheric exposure test during their master’s course stage in Kyushu University.
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/11/10
Y1 - 2019/11/10
N2 - A new cathodic protection technique for steel members in the atmospheric environment was developed in this study, Al-based alloy plate is a sacrificial anode, and fiber sheet was considered as electrolyte carrier. The reliabilities of components were clarified by comparing the material properties and electrochemical characteristics of alloy plates with different chemical composition. Besides, the galvanic current density and effective protection area of the corrosion protection system were discussed for solutions of various concentrations. Moreover, three types of corrosion tests were carried out to evaluate the effectiveness and durability of this system: the constant exposure test, accelerated exposure test, and atmospheric exposure test. The time-dependent anti-corrosion performance was discussed according to the characteristics of the corroded surface, and evaluated by discussing the effect of environmental variables and the exposed holes of the anode plates. The test results show that the sensitivity of the specimens to the changes in the environment is low, and that the cathodic protection current flows continuously, irrespective of whether it rained or not. In addition, the anode consumption of an Al-20Zn (mass%) alloy plate is the least, with good current efficiency, and an improvement in the anti-corrosion effect by adding elemental In to the anode plate cannot be expected. For all the test specimens, the current efficiency of the sacrificial anodes could on average reach about 70–80% in this system.
AB - A new cathodic protection technique for steel members in the atmospheric environment was developed in this study, Al-based alloy plate is a sacrificial anode, and fiber sheet was considered as electrolyte carrier. The reliabilities of components were clarified by comparing the material properties and electrochemical characteristics of alloy plates with different chemical composition. Besides, the galvanic current density and effective protection area of the corrosion protection system were discussed for solutions of various concentrations. Moreover, three types of corrosion tests were carried out to evaluate the effectiveness and durability of this system: the constant exposure test, accelerated exposure test, and atmospheric exposure test. The time-dependent anti-corrosion performance was discussed according to the characteristics of the corroded surface, and evaluated by discussing the effect of environmental variables and the exposed holes of the anode plates. The test results show that the sensitivity of the specimens to the changes in the environment is low, and that the cathodic protection current flows continuously, irrespective of whether it rained or not. In addition, the anode consumption of an Al-20Zn (mass%) alloy plate is the least, with good current efficiency, and an improvement in the anti-corrosion effect by adding elemental In to the anode plate cannot be expected. For all the test specimens, the current efficiency of the sacrificial anodes could on average reach about 70–80% in this system.
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U2 - 10.1016/j.conbuildmat.2019.07.067
DO - 10.1016/j.conbuildmat.2019.07.067
M3 - Article
AN - SCOPUS:85069693289
SN - 0950-0618
VL - 224
SP - 880
EP - 893
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -