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      Effects of magnesium chloride polluted soils on underground Q235 steel pipelines Translated title: Auswirkungen von Magnesiumchlroid-belasteten Erden auf Untergrundpipelines aus Stahl Q235

      1 , 1 , * , , 2 , 2
      Materials Testing
      Carl Hanser Verlag

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          This paper discusses the effects of soils polluted with different magnesium chloride (MgCl 2) contents on the corrosion of Q235 low-carbon steel pipelines. The material has a yield strength of 235 MPa. The following major parameters were considered in the experimental study to analyze MgCl 2 polluted soils: degree of saturation S r, electrical resistivity ρ s, oxidation reduction potential E h7 and corrosion potential E corr. The corrosion properties of Q235 steel samples buried in soils, such as corrosion behavior of macrographs and scanning electronic microscopy (SEM) photos, chemical elements components of corrosive products by energy dispersive spectrometer (EDS), corrosion weight loss m cor, corrosion rate v cor, and dynamic equation of m cor, were studied in detail. Based on the statistical analysis results obtained from this study, MgCl 2 has a significant impact on ρ s, while MgCl 2 has lesser effects on other parameters. Corrosion macro and micro behaviors of Q235 steel were revealed. The v cor of Q235 steel decreases with the increase of corrosion time (t), while it increases with MgCl 2 contents. The dynamic equation for m cor and the pollution impact factor β for Q235 steel in MgCl 2 polluted soils are proposed. Lastly, a developed multi-linear regression equation for v cor is recommended.


          In dem vorliegenden Beitrag werden die Effekte von Erden, die mit verschiedenen Gehalten an Magnesiumchlorid (MgCl 2) verschmutzt sind, auf die Korrosion von Pipelines aus Kohlenstoffstahl Q235 untersucht. Der Werkstoff hat eine Streckgrenze von 235 MPa. Die folgenden Haupteinflussparameter wurden in der entsprechenden Studie berücksichtigt: Sättigungsgrad S r, elektrischer Widerstand ρ s, Reduktions-Oxidations-Potential E h7 und das Korrosionspotential E corr. Hierzu wurden im Detail die Korrosionseigenschaften von Q235-Stahlproben, die in den Erden vergraben wurden, die makroskopischen Aufnahmen mittels Rasterelektronenmikroskop (REM), anhand derdie mittels energiedispersivem Spektrometer ermittelte chemische Zusammensetzung der Korrosionsprodukte, der Korrosionsmassenverlust m cor, die Korrosionsrate v cor und die dynamische Gleichung für m cor.- untersucht. Basierend auf der statistischen Analyse der in dieser Studie ermittelten Ergebnisse hat das MgCl 2 einen signifikanten Einfluss auf ρ s, während MgCl 2 geringere Effekte auf die anderen Parameter hat. Es wurde das Mikro- und Makroverhalten des Stahles ermittelt. Die Korrosionsrate v cor des Stahles Q235 nahm mit zunehmender Korrosionszeit t ab, während sie mit dem Gehalt an MgCl 2 zunahm. Es wurde eine dynamische Gleichung für m cor und der Verschmutzungseinflussfaktor β für den Stahl Q235 in MgCl 2-verschmutzten Erden aufgestellt. Schließlich wurde eine multilineare Regressionsgleichung für v cor empfohlen.

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          Most cited references33

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          The science of pipe corrosion: A review of the literature on the corrosion of ferrous metals in soils

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            Metal-contaminated soil remediation by means of paper mill sludges addition: chemical and ecotoxicological evaluation.

            Metal pollution of soils is a great environmental problem. The major risks due to metal pollution of soil consist of leaching to groundwater and potential toxicity to plants and/or animals. The objective of this study is to evaluate by means of chemical and ecotoxicological approach the effects of paper mill sludge addition on the mobile metal fraction of polluted metal soils. The study was carried out on acidic soil derived from mining activities and thus polluted with heavy metals, and on two paper mill sludges having different chemical features. The results obtained by leaching experiments showed that the addition of a paper mill sludge, consisting mainly of carbonates, silicates and organic matter, to a heavy-metal polluted soil produces a decrease of available metal forms. The carbonate content seems to play a key role in the chemical stabilisation of metals and consequently in a decrease of toxicity of soil. The leached solutions have a non-toxic effect. The mild remediation by addition of sludge has moreover a lasting effect.
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              Strength characteristics and mechanisms of salt-rich soil–cement


                Author and article information

                Materials Testing
                Carl Hanser Verlag
                1 October 2015
                : 57
                : 10
                : 850-858
                1 Middletown, Pennsylvania, USA
                2 Taiyuan, PR China
                Author notes
                [] Correspondence Address, Prof. Dr. Y. Frank Chen, Department of Civil Engineering, The Pennsylvania State University, 777 W Harrisburg Pike, Middletown, PA 17057-4898, USA, E-mail: yxc2@ 123456psu.edu

                Pengju Han, born in 1981, is Associate Professor of Taiyuan University of Technology, China. He obtained the doctor degree in Geotechnical Engineering from the same university in 2009. He was a visiting scholar of the Pennsylvania State of University, USA, in 2014. His study focuses on the corrosive and mechanical properties of civil materials.

                Y. Frank Chen, born in 1956, is currently tenured Professor of the Pennsylvania State University, Middletown, USA and distinguished Professor of Taiyuan University of Technology, China. He obtained his PhD degree from the University of Minnesota, Minneapolis, USA, in 1988. He is specialized in dynamic soil-structure interaction, computational methods, limit states design, mitigation for civil infrastructures and construction materials.

                Xiaohong Bai, born in 1959, is Professor of Taiyuan University of Technology, China. She obtained her PhD degree in Civil Engineering from the Glasgow University, UK, in 1992. Her primary research area is geotechnical engineering, particularly the characteristics of loess.

                Bin He, born in 1985, is a doctoral student of Taiyuan University of Technology, China. He obtained his Bachelor's degree in Civil Engineering from Southwest Forestry University, Kunming, China, in 2010. His primary research area is geotechnical engineering.

                © 2014, Carl Hanser Verlag, München
                Page count
                References: 38, Pages: 9
                Fachbeiträge/Technical Contributions

                Materials technology,Materials characterization,Materials science
                Materials technology, Materials characterization, Materials science


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