TITLE

EVALUACIÓN MICROESTRUCTURAL DE RECUBRIMIENTOS DE Zn 4Al, Zn 6Al Y Zn 10Al SOBRE UN ACERO SAE 1020 SOMETIDO A ENSAYOS DE TRACCIÓN

AUTHOR(S)
González, Gerardo; Pacheco, Anahan
PUB. DATE
January 2010
SOURCE
Acta Microscopica;2010, Vol. 19 Issue 1, p78
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Nowadays, Zinc Aluminum Alloys (ZA) are generally used for galvanization, in order to prevent the attack produced by corrosion. In this investigation, the microstructure of deposited layers of ZA on SAE 1020 steel is evaluated, as well as its behavior when submitted to tensile tests. For this purpose, several standardized test were carried out according to the norm COVENIN 299, after applying the covering layers of alloys; Zn-4%Al, Zn-%6Al and the Zn-10%Al by the method of hot immersion. After performing the tensile test, a metallographic examination was made, according to norm ASTM E-3. The measurement of the thickness of the layers and the counting of cracks was made by Optics Microscopy (OM). The microstructure analysis was made by Scanning Electronic Microscopy (SEM). The characterization of the micro-components was made with the application of EDX. It can be concluded that the samples with better mechanical properties, were those covered with the alloy of Zn - 6%Al. The observed microstructure displayed Zn-Al-Fe precipitates in a rich Zinc matrix; they increase in quantity and size with the percentage of aluminum in the alloy.
ACCESSION #
69583509

 

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