Instantly Investigating the Adsorption of Polymeric Corrosion Inhibitors on Magnesium Alloys by Surface Analysis under Ambient Conditions

Lívia M. Garcia Gonçalves, Larissa C. Sanchez, Stephani Stamboroski, Yendry R. Corrales Urena, Welchy Leite Cavalcanti, Jörg Ihde, Michael Noeske, Marko Soltau, Kai Brune

Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM, Bremen, Germany.
Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM, Bremen, Germany CAPES Foundation, Ministry of Education of Brazil, Brasília, Brazil Department of Materials Engineering, UFSCar, Federal University of S?o Carlos, S?o Carlos, Brazil.
Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM, Bremen, Germany UNESP S?o Paulo State University, S?o Paulo, Brazil.
Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM, Bremen, GermanyCAPES Foundation, Ministry of Education of Brazil, Brasília, Brazil Department of Chemistry, UFSC, Federal University of Santa Catarina, Florianópolis, Brazil.
Straetmans High TAC GmbH, Hamburg, Germany.

DOI: 10.4236/jsemat.2014.45032                

Abstract

Surface engineering of magnesium alloys requires adequate strategies, processes and materials permitting corrosion protection. Liquid formulations containing corrosion inhibitors often are to be optimized according to the demands of the respective substrate and following the service conditions during its application. As an interdisciplinary approach, a combination of several techniques for instantly monitoring or elaborately analyzing the surface state of magnesium was accomplished in order to characterize the performance of new adsorbing sustainable amphiphilic polymers which recently were developed to facilitate a multi-metal corrosion protection approach. The application of established techniques like Contact Angle measurements and X-ray Photoelectron Spectroscopy investigations was supplemented by introducing related and yet faster online-capable and larger-scale techniques like Aerosol Wetting Test and Optically Stimulated Electron Emission. Moreover, an inexpensive setup was configured for scaling the inset and the extent of degradation processes which occur at local electrochemical circuits and lead to hydrogen bubble formation. Using these analytical tools, changes of the surface state of emeried AM50 samples were investigated. Even in contact with water, being a moderate corrosive medium, the online techniques facilitated detecting surface degradation of the unprotected magnesium alloy within some seconds. In contrast, following contact with a 1 weight% formulation of a polymeric corrosion inhibitor, surface monitoring indicated a delay of the onset of degradation processes by approximately two orders of magnitude in time. Mainly based on the spectroscopic investigations, the corrosion inhibiting effects of the investigated polymer are attributed to the adsorption of a primary polymer layer with a thickness of a few nanometers which occurs within some seconds. Immersion of magnesium for several hours brings up a protective film with around ten nanometers thickness.

Keywords

Online Surface Monitoring, Magnesium Alloys, Polymeric Corrosion Inhibitors, Fast Screening of Effective Formulations, Optimization of Application Process

Conflicts of Interest

The authors declare no conflicts of interest.

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