A Comparative Study of Corrosion AA6061 and AlSi10Mg Alloys Produced by Extruded and Additive Manufacturing.

Francisco Estupiñan-López,Erick Maldonado-Bandala,Jesús Jáquez-Muñoz,Citlalli Gaona-Tiburcio,José Cabral-Miramontes,Juan Pablo Flores-De Los Rios,Facundo Almeraya-Calderón,Demetrio Nieves-Mendoza,Anabel D Delgado,Patricia Zambrano-Robledo

doi:10.3390/ma14195793

Abstract

The aim of this work was to evaluate the corrosion behavior of the AA6061 and AlSi10Mg alloys produced by extruded and additive manufacturing (selective laser melting, SLM). Alloys were immersed in two electrolytes in H2O and 3.5 wt. % NaCl solutions at room temperature and their corrosion behavior was studied by electrochemical noise technique (EN). Three different methods filtered EN signals, and the statistical analysis was employed to obtain Rn, the localization index (LI), Kurtosis, skew, and the potential spectral density analysis (PSD). The Energy Dispersion Plots (EDP) of wavelets method was employed to determine the type of corrosion and the Hilbert–Huang Transform (HHT), analyzing the Hilbert Spectra. The result indicated that the amplitude of the transients in the time series in potential and current is greater in the AlSi10Mg alloy manufactured by additive manufacturing. The amplitude of the transients decreases in both alloys (AA6061 and AlSi10Mg) as time increases.

Highlights

The Layered Manufacturing about the nature of the process is additive manufacturing, where three-dimensional parts can be made [1,2,3]
Microstructural analysis indicated that alloys produced by additive manufacturingSLM were more susceptible to localized corrosion due to porosity
electrochemical noise technique (EN) results showed that the amplitude of the transients in both the potential and current time series was greater in the AlSi10Mg (Al-A.M.) alloy manufactured by additive manufacturing

Summary

Introduction

The Layered Manufacturing about the nature of the process is additive manufacturing, where three-dimensional parts can be made [1,2,3]. Additive Manufacturing (A.M.) technologies have been developed to fabricate parts using metal powder. Emerging layer-by-layer manufacturing technology for producing metallic components and parts is additive manufacturing by selective laser melting (SLM). This technique uses a laser to transform metallic powder into a solid piece [5,6,7]. The advantages of this technique are reduced consumption of raw materials and energy, rapid and continuous production, and the fabrication of geometrically complex parts [8,9]. The microstructure differences change the mechanical and corrosion properties compared to components made by conventional methods [10,11]

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