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Dos aleaciones de magnesio ZE41 y AZ91D,producidas comercialmente, fueron estudiadas mediante microscopia de fuerza atomica con sonda Kelvin de barrido (SKPFM, siglas en ingles) con el fin de evaluar el papel de sus fases microconstituyentes en interacciones galvanicas potenciales. Los analisis mostraron que las fases microconstituyentes presentes en ambas aleaciones de magnesio exhibieron diferencias de potenciales Volta positivos con relacion a la matriz, indicaron un comportamiento catodico. Dicho comportamiento fue corroborado mediante ensayos de inmersion en una solucion agresiva de NaCl al 3.5 % en peso. Este ensayo confirmo que las fases presentes en las aleaciones estudiadas actuaron como sitios efectivos promoviendo el inicio de corrosion localizada. Ademas, la intensidad delataque dependio de los valores de potenciales Volta de cada fase, asi como de su distribucion en la aleacion. Abstract Two commercially produced magnesium alloys, ZE41 and AZ91D, were studied by scanning Kelvin probe force microscopy (SKPFM) in order to evaluate the role of their micro-constituent phases on potential galvanic interactions. SKPFM measurements showed that these phases exhibited positive Volta potentials differences relative to the matrix, indicating a cathodic behaviour. The influence of these phases on the initiation of corrosion was examined by immersion tests in 3.5 wt. % NaCl solution. Immersion testing confirmed that, for both alloys, the micro-constituents phases were effective sites to promote the beginning of localized corrosion. Further, the intensity of the corrosion attack depended on the Volta potential value for each phase, as well as their distribution within the alloy.

Caracterización de aleaciones de magnesio mediante microscopía de fuerza atómica con sonda Kelvin de barrido (SKPFM)