<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1665-2738</journal-id>
<journal-title><![CDATA[Revista mexicana de ingeniería química]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Ing. Quím]]></abbrev-journal-title>
<issn>1665-2738</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Metropolitana, División de Ciencias Básicas e Ingeniería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-27382008000100004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Acción galvánica superficial en una matriz de acero al carbono constituida por microceldas con granos de ferrita y perlita]]></article-title>
<article-title xml:lang="en"><![CDATA[Surface galvanic action on a carbon steel matrix microcell consisting on ferrite and pearlite grains]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[León-Bello]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Amaya-Malpica]]></surname>
<given-names><![CDATA[M. G.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Mexicano del Petróleo  ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2008</year>
</pub-date>
<volume>7</volume>
<numero>1</numero>
<fpage>29</fpage>
<lpage>33</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-27382008000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-27382008000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-27382008000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Con el propósito de dilucidar los parámetros de ingeniería que cuantifiquen el efecto de las reacciones electroquímicas de corrosión en el acero al carbono, se propone un modelo termodinámico irreversible para estimar la acción galvánica en una matriz heterogénea y policristalina, formada por granos de ferrita y perlita. El modelo considera un sistema abierto que representa la superficie de la matriz metálica y el electrolito. La acción galvánica a escala microscópica se describe mediante un sistema de ecuaciones que reúne los efectos de la difusión térmica, la codifusión debida a un gradiente de potencial químico y las contribuciones a la producción de entropía debidas al flujo de calor y a la corriente de difusión. La aplicación del modelo requiere validarse con experimentos en los que se obtengan valores adecuados de los coeficientes fenomenológicos. La naturaleza heterogénea del arreglo de los granos en la superficie del acero, corresponde con un mecanismo heterogéneo de la acción galvánica, por lo que los parámetros de ingeniería resultado del análisis son valores medios de las magnitudes de las propiedades extensivas del sistema.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[An irreversible thermodynamics model is proposed to estimate galvanic action on a heterogeneous polycrystalline matrix, made on ferrite and pearlite grains, in order to find engineering parameters to account for the effect of electrochemical reactions due to corrosion processes on carbon steel. The model is based on an open system representing the surface of the metallic matrix and the electrolyte. The galvanic action at microscopic scale is described by a system of equations that meets thermal diffusion and chemical co diffusion effects with entropy production due to both heat and diffusion fluxes. The application of the model requires an experimental validation on which adequate values for the phenomenological coefficients were found. The heterogeneous nature of the grains arrangement on the carbon steel surface corresponds to a heterogeneous mechanism of galvanic action so that the resulting engineering parameters are mean values of the magnitude on the extensive properties of the system.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[acción galvánica]]></kwd>
<kwd lng="es"><![CDATA[acero al carbono]]></kwd>
<kwd lng="es"><![CDATA[afinidad electrónica]]></kwd>
<kwd lng="es"><![CDATA[procesos irreversibles]]></kwd>
<kwd lng="es"><![CDATA[corrosión por celda local]]></kwd>
<kwd lng="en"><![CDATA[galvanic action]]></kwd>
<kwd lng="en"><![CDATA[carbon steel]]></kwd>
<kwd lng="en"><![CDATA[electronic affinity]]></kwd>
<kwd lng="en"><![CDATA[irreversible processes]]></kwd>
<kwd lng="en"><![CDATA[local cell corrosion]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Fen&oacute;menos de transporte</font></p>     <p align="justify"><font face="verdana" size="4">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Acci&oacute;n galv&aacute;nica superficial en una matriz de acero al carbono constituida por microceldas con granos de ferrita y perlita</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Surface galvanic action on a carbon steel matrix microcell consisting on ferrite and pearlite grains</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>F. Le&oacute;n&#150;Bello* y M. G. Amaya&#150;Malpica</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Instituto Mexicano del Petr&oacute;leo, Eje Central L&aacute;zaro C&aacute;rdenas No. 152, 07730 San Bartolo Atepehuacan, M&eacute;xico, D.F., M&eacute;xico. <i>* Corresponding author: E&#150;mail: </i></i><a href="mailto:fleonb@imp.mx">fleonb@imp.mx</a><i><i> Fax: 9175&#150;7069</i></i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido 31 de Enero 2006    <br> Aceptado 21 de Enero 2008</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">Con el prop&oacute;sito de dilucidar los par&aacute;metros de ingenier&iacute;a que cuantifiquen el efecto de las reacciones electroqu&iacute;micas de corrosi&oacute;n en el acero al carbono, se propone un modelo termodin&aacute;mico irreversible para estimar la acci&oacute;n galv&aacute;nica en una matriz heterog&eacute;nea y policristalina, formada por granos de ferrita y perlita. El modelo considera un sistema abierto que representa la superficie de la matriz met&aacute;lica y el electrolito. La acci&oacute;n galv&aacute;nica a escala microsc&oacute;pica se describe mediante un sistema de ecuaciones que re&uacute;ne los efectos de la difusi&oacute;n t&eacute;rmica, la codifusi&oacute;n debida a un gradiente de potencial qu&iacute;mico y las contribuciones a la producci&oacute;n de entrop&iacute;a debidas al flujo de calor y a la corriente de difusi&oacute;n. La aplicaci&oacute;n del modelo requiere validarse con experimentos en los que se obtengan valores adecuados de los coeficientes fenomenol&oacute;gicos. La naturaleza heterog&eacute;nea del arreglo de los granos en la superficie del acero, corresponde con un mecanismo heterog&eacute;neo de la acci&oacute;n galv&aacute;nica, por lo que los par&aacute;metros de ingenier&iacute;a resultado del an&aacute;lisis son valores medios de las magnitudes de las propiedades extensivas del sistema.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>acci&oacute;n galv&aacute;nica, acero al carbono, afinidad electr&oacute;nica, procesos irreversibles, corrosi&oacute;n por celda local.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">An irreversible thermodynamics model is proposed to estimate galvanic action on a heterogeneous polycrystalline matrix, made on ferrite and pearlite grains, in order to find engineering parameters to account for the effect of electrochemical reactions due to corrosion processes on carbon steel. The model is based on an open system representing the surface of the metallic matrix and the electrolyte. The galvanic action at microscopic scale is described by a system of equations that meets thermal diffusion and chemical co diffusion effects with entropy production due to both heat and diffusion fluxes. The application of the model requires an experimental validation on which adequate values for the phenomenological coefficients were found. The heterogeneous nature of the grains arrangement on the carbon steel surface corresponds to a heterogeneous mechanism of galvanic action so that the resulting engineering parameters are mean values of the magnitude on the extensive properties of the system.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>galvanic action, carbon steel, electronic affinity, irreversible processes, local cell corrosion.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmiq/v7n1/v7n1a4.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a> </font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">&Aacute;vila, J. y Genesc&aacute;, J. (1986). <i>M&aacute;s all&aacute; de la herrumbre. </i>La ciencia desde M&eacute;xico, No. 9. Fondo de Cultura Econ&oacute;mica, M&eacute;xico, D. F.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8532021&pid=S1665-2738200800010000400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">Besson, J. (1984). <i>Pr&eacute;cis de thermodynamique &amp; cin&eacute;tique &eacute;lectrochimiques</i>. Ellipses, Paris.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8532023&pid=S1665-2738200800010000400002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">Bockris, J. y Reddy, A. (1919). <i>Electroqu&iacute;mica moderna Volumen 2. </i>Editorial Revert&eacute;, Barcelona, Espa&ntilde;a.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8532025&pid=S1665-2738200800010000400003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">Cabrera&#150;Sierra, R., Batina, N. y Gonz&aacute;lez, I. (2006). Oxidation of 1018 carbon steel in borate medium by in situ EC&#150;STM: Surface morphology of the oxidized ferrite and pearlite  phases. <i>Materials  Chemistry and </i><i>Physics 96, </i>343&#150;348.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8532027&pid=S1665-2738200800010000400004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">Fitts, D. (1962). <i>Nonequilibrium thermodynamics. </i>McGraw Hill, Nueva York, EEUU.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8532029&pid=S1665-2738200800010000400005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">Hume&#150;Rothery, W. (1966). <i>The structures of alloys of iron. </i>Pergamon Press, Oxford, EEUU.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8532031&pid=S1665-2738200800010000400006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">Kokawa, H., Shimada, M., Wang, Z. J., Sato Y. S. y Michiuchi, M. (2004). Grain boundary engineering for intergranular corrosion resistant austenitic stainless steel. <i>Key Engineering Materials 261&#150;263, </i>1005&#150;1010.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8532033&pid=S1665-2738200800010000400007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">Le&oacute;n, F., Beakou, A. y Amaya, M. G. (2008). Metal&#150;electrolyte interface interaction on a negative electrochemical device. <i>Journal of Molecular Catalysis A: Chemical 281, </i>226&#150;229.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8532035&pid=S1665-2738200800010000400008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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<body><![CDATA[ ]]></body><back>
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