The rare-earth organic compound Gadolinium 4-hydroxycinnamate (Gd(4OHCin)3) was characterized and shown to be an effective corrosion inhibitor for mild steel in naturally-aerated 0.1 M chloride solution, not only of general corrosion but also of pitting corrosion. As the inhibition content increased, the corrosion inhibition efficiency increased, up to 94% at concentration of 0.93 mM inhibitor. The results also indicate that Gd(4OHCin)3 behaves as a mixed inhibitor but more predominantly as an anodic inhibitor. The inhibition is attributed to the formation of a protective film layer which acts as a barrier layer on the steel surface. The infrared spectra also confirm a synergetic inhibition mechanism by rare earth and organic components of Gd (4OHCin)3, which depends on inhibitor concentration and immersion time.
|Number of pages||13|
|Journal||Journal of the Taiwan Institute of Chemical Engineers|
|Early online date||2 Aug 2019|
|Publication status||Published - Oct 2019|