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

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