Inhibición de la corrosión del acero al carbono tipo N80 utilizando polvo de cáscara de huevo en ambientes ácidos y salinos: un estudio basado en ensayos de pérdida de peso, microindentación y modelado electroquímico

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J. L. Dávalos-Monteiro
C. D. Rodriguez-Hernandez
R. M. Rached
R. Dávalos-Monteiro

Resumen

La corrosión representa un desafío importante para la industria del petróleo y del gas, especialmente en sistemas expuestos a ambientes ácidos y de alta salinidad. Este estudio evalúa el polvo de cáscara de huevo, un residuo biológico, como inhibidor ecológico de la corrosión del acero al carbono tipo N80 bajo condiciones representativas de ambientes ácidos y salinos. Se analizaron muestras de acero expuestas a soluciones de ácido clorhídrico (HCl) 2 M y cloruro de sodio (NaCl) 2 M, con y sin 6 g/L de polvo de cáscara de huevo, durante seis días. La tasa de corrosión, determinada a partir de la pérdida de masa, mostró una mejora significativa en medio ácido, al disminuir de 18.8 mm/año a 2.1 mm/año, con una eficiencia de inhibición del 90 %. En condiciones salinas, el efecto fue moderado, con una reducción del 14 %. El análisis de microindentación indicó que las muestras tratadas conservaron al menos el 85 % de la dureza del acero no expuesto, mientras que las no tratadas sufrieron una degradación severa. Los resultados sugieren que la protección se debe a la formación de una barrera de carbonato de calcio, la estabilización de la capa de productos de corrosión y la captura de iones agresivos, como el cloruro. Este estudio demuestra que el polvo de cáscara de huevo es una alternativa viable y sostenible para mitigar la corrosión en entornos industriales exigentes.

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