Comprehensive screening of Mg corrosion inhibitors

This work presents the results of a systematic screening for magnesium corrosion inhibitors. The ability to form stable soluble complexes with Feii/iii was considered on first place when choosing the compounds for hydrogen evolution tests. Inhibiting effect of 151 individual compounds was tested towards six alloys (AZ31, AZ91, AM50, WE43, ZE41 and Elektron 21) and three grades of pure magnesium. Newly identified and previously reported inhibitors are ranked by their inhibiting efficiency and compared with Cr (VI) reference. A number of new inhibitors are discovered with efficiency exceeding that of chromate.