Estimation and mapping of the contribution of nitric acid to atmospheric corrosion of zinc
Por:
Castillo-Miranda, J. O., Rodriguez-Gomez, F. J., Genesca-Llongueras, J., Ruiz-Suarez, L. G., Garcia-Reynoso, J. A.
Publicada:
1 ene 2021
Resumen:
BACKGROUND AND OBJECTIVES: Atmospheric zinc corrosion in the Mexico City
Metropolitan area has long been attributed mainly to the effect of
pollutants such as sulfur dioxide. There are changes in the urban
atmosphere's chemical composition due to the implementation of air
quality policies focused on reducing the emission of sulfur dioxide and
other pollutants. This study's objectives were to estimate and map the
contribution of nitric acid on zinc's atmospheric corrosion process.
METHODS: The impact of nitric acid on zinc is feasible to estimate using
a function for a multi-pollutant situation. This function contemplates
the sum of two contributions: one of nitric acid and another that
includes sulfuric acid and climatic parameters. The multi-pollutant
function is suitable to apply in areas without the strong influence of
chlorides and tropical and subtropical climates, comparable to the
Mexico City Metropolitan area.
FINDINGS: The results showed that spatial and temporal estimation of
corrosion rates in grams per square meter of zinc was made for
2015-2019, using data modeling in a geographic information system. The
maps of corrosion rates allowed us to visualize that, in general, the
``southwest'' zone has the most significant effects and that the
lowest corrosion rates were presented in 2019 as an outcome of the
implementation of air quality programs. Furthermore, a contribution of
nitric acid up to 32% to the zinc corrosion rate was estimated.
CONCLUSION: The construction of corrosion rate maps provides a spatial
and temporal estimate that allows visualizing areas where zinc materials
are at risk corrosion due to the dispersion of atmospheric pollutants
and climatic parameters. Likewise, it can represent a decision-making
tool for the implementation of atmospheric corrosion studies of
materials. (C) 2021 GJESM. All rights reserved.
Filiaciones:
Castillo-Miranda, J. O.:
Univ Nacl Autonoma Mexico, Fac Quim, Dept Ingn Met, Circuito Exterior S-N,Ciudad Univ, Ciudad De Mexico 04510, Mexico
Rodriguez-Gomez, F. J.:
Univ Nacl Autonoma Mexico, Fac Quim, Dept Ingn Met, Circuito Exterior S-N,Ciudad Univ, Ciudad De Mexico 04510, Mexico
Genesca-Llongueras, J.:
Univ Nacl Autonoma Mexico, Polo Univ Tecnol Avanzada, Via Innovac 410 PIIT Autopista Monterrey, Apodaca 66629, Nuevo Leon, Mexico
Ruiz-Suarez, L. G.:
Univ Nacl Autonoma Mexico, Ctr Ciencias Atmosfera, Circuito Invest Cient, Ciudad Univ, Ciudad De Mexico 04510, Mexico
Garcia-Reynoso, J. A.:
Univ Nacl Autonoma Mexico, Ctr Ciencias Atmosfera, Circuito Invest Cient, Ciudad Univ, Ciudad De Mexico 04510, Mexico
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