Surface changes of Mg powder induced by hydration in different environments

Primárne karty

ISBN: ISBN 978-80-972360-7-6

Surface changes of Mg powder induced by hydration in different environments

Veronika Nagy Trembošová1 , Štefan Nagy , Martin Nosko , Erik Šimon , Matej Štepánek ,
1 Ústav materiálov a mechaniky strojov SAV, Bratislava, SLOVENSKO
ummstrem@savba.sk

Along with mechanical modifications, creating a protective barrier that effectively isolates the metal from the environment is an effective way to improve Mg corrosion. It is possible to form carbonate from magnesium oxide below 200°C and with the presence of H2O [1]. For CO2 capture can be used besides MgO also Mg(OH)2 [2]. It has been reported that the layer of carbonates, which is formed after Mg exposure to corrosion environment on the surface of magnesium, causes a reduction in the corrosion rate [3]. In order for the protective layer to be effective against corrosion, it must be well adhered and without any defects. The protective layer's design on magnesium particles in PM technology plays a crucial role in producing the compact made from powders with desirable corrosion and mechanical properties. An acidic, basic, and neutral hydrating environment was studied for the creation of magnesium carbonate. These were chosen to determine the hydration rate, product formed on the Mg powders surface, and possible transformation to the carbonate layer. Mechanical and corrosion properties were measured on extruded compacts.

Poďakovanie: 

This work was performed during the implementation of the project Building-up Centre for advanced materials application of the SAS, ITMS project code 313021T081 supported by Research & Innovation Operational Programme funded by the ERDF and VEGA 2/0098/19.

Zdroje: 

[1] G. Song, Y. Ding, X. Zhu, Q.Liao, „Carbon dioxide adsorption characteristics of synthesized MgO with various porous structures achieved by varying calcination temperature“, Colloids and Surfaces A: Physicochemical and Engineering Aspects, vol. 470, pp. 39-45, (2015).
[2] B. Zhang, Y. Duan, K. Johnson, „Density functional theory study of CO2 capture with transition metal oxides and hydroxides“, Journal of Chemical Physics, vol. 136, (2012).
[3] Y. Zheng, Magnesium  Alloys  As  Degradable  Biomaterials.  CRC  Press, (2016).