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| − | ==1 Title, abstract and keywords<!-- Your document should start with a concise and informative title. Titles are often used in information-retrieval systems. Avoid abbreviations and formulae where possible. Capitalize the first word of the title. | + | ==Abstract== |
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| − | Provide a maximum of 6 keywords, and avoiding general and plural terms and multiple concepts (avoid, for example, 'and', 'of'). Be sparing with abbreviations: only abbreviations firmly established in the field should be used. These keywords will be used for indexing purposes.
| + | In previous work on galvanized reinforcements in contact with Ca-containing highly alkaline media, the authors have reported the existence of a threshold pH below with such a medium is passivated, but at pH values above this it corrodes continuously until it totally disappears. In this paper, after a brief literature review concerning the identification of the corrosion products in these media, they report that the passivation detected from the data of the polarisation technique agreed with the results of an SEM study. They show that below the threshold pH value the surface is covered with a continuous layer of calcium hydroxyzincate, Ca[Zn(OH)<sub>3</sub>]<sub>2</sub>.2H<sub>2</sub>O, and above this pH, the layer increase its proportion of non-passivating ZnO, to the detriment of the calcium hydroxyzincate contents. They have also established that it is the (Ca<sup>2+</sup>) ions that control the amount of calcium hydroxizincate formed, and therefore the likelihood of the formation of a continuous passivating layer. Finally, they report that if the calcium hydroxyzincate is perfectly developed, a later increase of the pH does not affect the stability. En trabajos anteriores que estudiaban el comportamiento de armaduras galvanizadas en contacto con medios fuertemente alcalinos que contienen calcio, los autores han señalado la existencia de un umbral de pH por debajo del cual el Zn en contacto con tales medios se pasiva, mientras que a valores de pH superiores al umbral, se corroe continuamente hasta su total desaparición. En este articulo, después de una breve revisión bibliográfica de los productos de corrosión en este medio, se indica que la pasivación detectada a través de los datos suministrados por la técnica de Rp está de acuerdo con los resultados y observaciones del estudio microscópico realizado. Se muestra que por debajo del pH umbral la superficie se encuentra cubierta por una capa continua de hidroxizincato calcico, Ca[Zn(OH)<sub>3</sub>]<sub>2</sub>.2H<sub>2</sub>O y por encima de este pH, esta capa aumenta su proporción de ZnO no pasivante, en detrimento del contenido en hidroxizincato calcico. También se establece que los iones Ca<sup>2+</sup> controlan la cantidad de hidroxizincato de calcio formada, y por lo tanto la probabilidad de formación de una capa continua pasivante. Finalmente, se señala que si la capa protectora de hidroxizincato de calcio está perfectamente formada, un posterior incremento del pH no afecta significativamente su estabilidad. |
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| + | ==Full Document== |
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| − | ==5 References<!--[1] Author, A. and Author, B. (Year) Title of the article. Title of the Publication. Article code. Available: http://www.scipedia.com/ucode.
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In previous work on galvanized reinforcements in contact with Ca-containing highly alkaline media, the authors have reported the existence of a threshold pH below with such a medium is passivated, but at pH values above this it corrodes continuously until it totally disappears. In this paper, after a brief literature review concerning the identification of the corrosion products in these media, they report that the passivation detected from the data of the polarisation technique agreed with the results of an SEM study. They show that below the threshold pH value the surface is covered with a continuous layer of calcium hydroxyzincate, Ca[Zn(OH)3]2.2H2O, and above this pH, the layer increase its proportion of non-passivating ZnO, to the detriment of the calcium hydroxyzincate contents. They have also established that it is the (Ca2+) ions that control the amount of calcium hydroxizincate formed, and therefore the likelihood of the formation of a continuous passivating layer. Finally, they report that if the calcium hydroxyzincate is perfectly developed, a later increase of the pH does not affect the stability. En trabajos anteriores que estudiaban el comportamiento de armaduras galvanizadas en contacto con medios fuertemente alcalinos que contienen calcio, los autores han señalado la existencia de un umbral de pH por debajo del cual el Zn en contacto con tales medios se pasiva, mientras que a valores de pH superiores al umbral, se corroe continuamente hasta su total desaparición. En este articulo, después de una breve revisión bibliográfica de los productos de corrosión en este medio, se indica que la pasivación detectada a través de los datos suministrados por la técnica de Rp está de acuerdo con los resultados y observaciones del estudio microscópico realizado. Se muestra que por debajo del pH umbral la superficie se encuentra cubierta por una capa continua de hidroxizincato calcico, Ca[Zn(OH)3]2.2H2O y por encima de este pH, esta capa aumenta su proporción de ZnO no pasivante, en detrimento del contenido en hidroxizincato calcico. También se establece que los iones Ca2+ controlan la cantidad de hidroxizincato de calcio formada, y por lo tanto la probabilidad de formación de una capa continua pasivante. Finalmente, se señala que si la capa protectora de hidroxizincato de calcio está perfectamente formada, un posterior incremento del pH no afecta significativamente su estabilidad.
