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Corrosion resistance in chloride solution of the AlSi10Mg alloy obtained by means of LPBF |
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| Authors: | Marina Cabrini Sergio Lorenzi Tommaso Pastore Cristian Testa Diego Manfredi Giulio Cattano Flaviana Calignano |
| Institution: | 1. Department of Engineering and Applied Sciences, University of Bergamo, Bergamo, Italy;2. Center for Sustainable Future Technologies CSFT@PoliTo, Istituto Italiano di Tecnologia-IIT, Torino, Italy;3. Department of Management and Production Engineering (DIGEP), Politecnico di Torino, Torino, Italy |
| Abstract: | The paper deals with the corrosion resistance in chloride solutions of an AlSi10Mg alloy obtained by laser powder bed fusion (LPBF) process. The potentiodynamic tests were carried out in solutions having different chloride contents. The results emphasize the role of chloride concentration on localized corrosion. The increase of concentration reduces pitting potential. In addition, the influence of the post-processing heat treatment temperature was recognized. Penetrating attacks occurred either on after low temperatures stress relieving or specimens without any treatment, promoted by selective dissolution of the α-Al phase stimulated by galvanic coupling with noble silicon precipitates at the border of the melt pool. Such penetrating morphology was not observed after heat treatments at high temperature. |
| Keywords: | additive manufacturing Aluminium alloy heat treatment laser powders bed fusion pitting potential |