The corrosion of brass in artificial seawater, (ASW), and in natural seawater, (NSW), collected at the beach of Ericeira, Portugal, was studied. The weight gains and the corresponding average corrosion rates of brass samples, immersed in both media, during periods of 1 week, 1, 3 and 6 months were determined. The concentrations of Cu 2+ and Zn 2+ ions in solution, produced by the corrosion of brass, were determined by atomic absorption spectrometry. The concentration of dissolved oxygen was also determined. The morphology of the corroded surfaces, with and without the corrosion products, was analyzed by visual observation and by scanning electron microscopy. The hydrated basic zinc chloro-sulfate compound, Zn 12 (OH) 15 Cl 3 (SO 4 ) 3 AE 5H 2 O, was identified by X-ray powder diffraction as the predominant compound in all the samples, particularly in those with longer exposure to NSW. It was concluded that the corrosion of brass in natural seawater is much higher than in artificial seawater.

The aim of this article is to map the current state of knowledge on the digital competences of higher education professors in the European context through a scoping review. The initial search in resulted in 1,568 publications, which, after applying the selection criteria, resulted in the inclusion of 14 publications. The content analysis showed that the digital tools made available by the intuitions are widely known by the professors, although they have little use. A broad use of the LMS was evidenced, but more specifically to administrative activities than to activities connected with the teaching and learning process. There was also a positive relationship between the level of digital competences and the pedagogical approach adopted by professors (focus on the construction of knowledge by the students, development of open education resources) as well as the participation in research projects. Teachers’ training was pointed out as a relevant topic and the literature analysed referred that this should be preceded by a rigorous analysis of the professors’ digital competence levels so that this process can be carried out in the most personalized way possible.