Revista de Metalurgia, Vol 50, No 1 (2014)

Corrosión galvánica de aleaciones de magnesio AM50 y AZ91D modificadas con tierras raras en contacto con acero y aleaciones de aluminio


https://doi.org/10.3989/revmetalm.002

Marta Mohedano
Departamento de Ciencia de Materiales, Facultad de Químicas, Universidad Complutense, España

Raúl Arrabal
Departamento de Ciencia de Materiales, Facultad de Químicas, Universidad Complutense, España

Angel Pardo
Departamento de Ciencia de Materiales, Facultad de Químicas, Universidad Complutense, España

Karín Paucar
Gabinete de Corrosión, Facultad de Ingeniería Química y Textil, Universidad Nacional de Ingeniería, Perú

M. Concepción Merino
Departamento de Ciencia de Materiales, Facultad de Químicas, Universidad Complutense, España

Endzhe Matykina
Departamento de Ciencia de Materiales, Facultad de Químicas, Universidad Complutense, España

Beatriz Mingo
Departamento de Ciencia de Materiales, Facultad de Químicas, Universidad Complutense, España

Gerardo Garcés
Centro Nacional de Investigaciones Metalúrgicas (CENIM). CSIC, España

Resumen


Se emplearon medidas electroquímicas y gravimétricas para examinar el efecto de la adición de neodimio y gadolinio en el comportamiento a la corrosión galvánica de las aleaciones AM50 y AZ91D en contacto con acero al carbono A 570 Gr 36 y aleaciones de aluminio AA2011 y AA6082. Las aleaciones modificadas con tierras raras mostraron intermetálicos Al2Nd/Al2Gd y Al-Mn-Nd/Al-Mn-Gd, menor fracción de fase β-Mg17Al12 y un incremento de la resistencia a la corrosión debido al aumento de la pasividad de la superficie y a la eliminación de micro pares galvánicos. Las adiciones de neodimio y gadolinio mejoraron la resistencia a la corrosión galvánica de la aleación AM50, pero fueron menos efectivas en el caso de la aleación AZ91D. La aleación AA6082 fue el material más compatible y la aleación AA2011 el menos compatible.

Palabras clave


Aleaciones de magnesio; Corrosión galvánica; Pérdida de masa; Polarización

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Referencias


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