Publicado

2020-04-01

Protection against corrosion by molten salts through aluminum coatings deposited by arc thermal spray on ASTM A53 grade B steel

Protección contra la corrosión por sales fundidas del acero ASTM A53 grado B recubrimiento con aluminio depositado por rociado térmico por arco eléctrico

Palabras clave:

Aluminium, Corrosion, High temperature, Thermal Spray (en)
Aluminio, Corrosión, Alta temperatura, Rociado térmico (es)

Autores/as

ASTM A53 steel samples were coated with aluminium by EATS, they report continuity and adherence. Thermal treatment improved their performance against corrosion, because the aluminium inter-diffusions are produced from coating into substrate and iron from substrate into coating. Samples were subjected to molten salts corrosion (20 % Na2SO4 and 80 % V2O5) at range of (400–600)° C. Samples were characterized by SEM-EDS and the morphology of layers were studied, noting good protection of layer deposited and the degradation of coating happened at above fusion temperatures of salts, besides the corrosion rate increases with temperature and decreases with exposition time.

Muestras del acero ASTM A53 grado B fueron recubiertas por rociado térmico por arco eléctrico con aluminio; estos recubrimientos presentan una buena continuidad y adherencia. Se les realizó un tratamiento térmico para mejorar su desempeño a la corrosión, ya que se produce la inter difusión del aluminio del recubrimiento hacia el substrato y del hierro del substrato hacia el recubrimiento. Luego fueron sometidas a corrosión por sales fundidas compuestas por 20 % de sulfato de sodio (Na2SO4) y 80 % de pentóxido de vanadio (V2O5) en un rango de temperatura de 400–600°C. Se caracterizó las muestras por Microscopía Electrónica de Barrido (SEM), Espectroscopía de Energía Dispersada (EDS) y Difracción de Rayos X (XRD) y se estudió la morfología, la composición y la estructura de las capas formadas en donde se observó una buena protección de la capa rociada térmicamente y que la mayor degradación del recubrimiento protector generalmente ocurrió a temperaturas superiores a las temperaturas de fusión de las sales, además la velocidad de corrosión aumenta con la temperatura y disminuye con el tiempo de exposición. 

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