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Influence of Testing Temperature on the Corrosion Behavior of API 5L X70 Pipeline Steel

Journal of Mechanics Engineering and Automation 2014年第6期4卷 528-532页

作者： Carlos Antonio Vieira de Almeida Machado Renato Altobelli Antunes elisabete jorge pessine Olandir Vercino Correa Centro de Engenharia Modelagem e Ci~ncias Sociais Aplicadas (CECS) Universidade Federal do ABC Santo Andre 09210-580Brazil Centro de Ciencia e Tecnologia de Materiais (CCTM) Instituto de Pesquisas Energeticas e Nucleares(IPEN/CNEN-SP) Cidade Universitaria Sao Paulo 05508-000 Brazil

It is known that localized corrosion attack takes a preponderant role in the onset of stress corrosion cracking of pipeline steels in high pH conditions. Carbonate/bicarbonate solutions can be employed to study the localized corrosion behavior of these materials. In addition to the presence of chloride ions in the electrolyte, the solution temperature is also of prime importance to the onset of pitting corrosion. The aim of this work is to evaluate the influence of the testing temperature on the corrosion behavior of the API 5L X70 pipeline steel which is a standard material for gas pipelines in Brazil. Samples were exposed to a solution consisting of Na 2 CO 3, NaHCO 3 and NaCl at three different temperatures: RT (room temperature), 40 oC and 60 oC. The corrosion morphology was observed using SEM (scanning electron microscopy). The results showed that pitting corrosion became facilitated when the steel was immersed at higher temperatures.

关键词： X70管线钢测试温度腐蚀行为 API 扫描电子显微镜应力腐蚀开裂标准材料碳酸氢钠

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Microbial Community with Potential for Metal Release Isolated from Palca Mine Tailings Pond in Peru

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Journal of Geoscience and Environment Protection 2024年第7期12卷 109-121页

作者： César Wilber Guzmán Moreno Bruno Karolski Solange Kazue Utimura Roberto Castellanos Cabrera Jhon Albert Centeno Torres Daladier Miguel Castillo Cotrina elisabete de Santis Braga Dayana Sarai Gamonal Fermandez Denise Crocce Romano Espinosa Joel Barbujiani Sigolo Department of Sedimentary and Environmental Geology Institute of Geoscience USP So Paulo Brazil Department of Chemical Engineering LAREX USP So Paulo Brazil CEPEMA Environment Training and Research Center USP So Paulo Brazil Facultad de Ciencias Universidad Nacional Jorge Basadre Grohmann UNJBG Tacna Per Department of Physical Chemical and Geological Oceanography USP So Paulo Brazil Facultad de Ciencias Biolgicas Universidad Nacional Pedro Ruiz Gallo UNPRG Lambayeque Per

The improvement of microbial characterization has increased the comprehension of microbial population and their ability in the microbiological metal dissolution. Bioleaching processes have been expanded to use microorganisms for the recovery of metals from ores and wastes. This study introduces Palca mine tailings pond in Peru which turned into acid mine drainage (AMD). AMD is a source of microbial communities whose microorganisms may support the aqueous extractive metallurgy for metal recovery. Four samples of AMD were collected from different locations and the elemental characterization showed concentrations of metals, such as Cu, Zn, Al, Mn, and Fe. The pH of the samples showed variation between 1.9 - 6.8. Twenty-one microorganisms were isolated and selected according the cell morphology. 16s rRNA gene sequences identified five species of which three belong to the bacterial kingdom and two to the Fungi kingdom. Two of the bacterial species were ferrous ion oxidizing bacteria, identified as Acidithiobacillus ferriphilus and Acidithiobacillus ferridurans;and the other one a ferric ion reducing bacteria identified as Acidiphilium acidophilum. The fungi species identified were Rhodotorula sinensis and Exophiala xenobiotica, a filamentous fungus isolated for the first time from an AMD.

关键词： Acidophilic Microorganisms Acid Mine Drainage—AMD Bioleaching Process Metals Recovery Acidithiobacillus

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嘉卿会所-台丰高尔夫俱乐部

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现代装饰 2022年第4期 14-21页

作者： álvaro Siza Carlos Castanheira elisabete Queirós Catarina Araújo Erika Musci Filipe Mota Joana Soeiro Jo?o Alves jorge Pinheiro Mariana Mendes Nuno Campos Nuno Rodrigues Pedro Afonso Rita Saturnino Sara Pinto Sofia Concei??o Carlos Castanheira 范嘉苑

在高尔夫球运动中,力量与优雅的完美平衡是衡量其水平的一个基本准则。同样的,在建筑设计与建造的表达过程中,除了回应技术问题与基本需求以外,还需要考虑其他或简单或复杂的因素。衡量一个项目不仅只是看基本要素,即使它仅需要回应基...

在高尔夫球运动中,力量与优雅的完美平衡是衡量其水平的一个基本准则。同样的,在建筑设计与建造的表达过程中,除了回应技术问题与基本需求以外,还需要考虑其他或简单或复杂的因素。衡量一个项目不仅只是看基本要素,即使它仅需要回应基础功能。好的设计应该经过谨慎的思考,由此承载巨大能量,传达优雅气息。“经验分析”能够帮助我们辨别设计的第一步,它可能源自于一种态度、概念,或者一些难以解释的想法。

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