Rare Earth Element Β-Diketone complexes as Novel Corrosion Inhibitors for 304 and 316 Stainless Steel in 0.1 M Hcl Solution

The corrosion inhibition of austenitic stainless steel (304 and 316 SS) in 0.1M HCl solution was investigated in the temperature range of 20–60°C, using cerium and lanthanum acetylacetone and hexafluoroacetylacetone as potential green and novel corrosion inhibitors. Weight loss and potentiodynamic polarisation methods as well as surface analyses were used to investigate the effectiveness of these inhibitors in 0.1 M HCl solution. Experimental results showed that the rare earth elem REE β-diketonecomplexes are effective inhibitors to reduce the corrosion of 304 and 316 SS. Polarisation measurements indicated that the 〖Ce(acac)〗_3, 〖La(acac)〗_3,〖Ce(hfac)〗_3and〖La(hfac)〗_3 actedas cathodic inhibitors. The nature of the metal surface after exposure to the corrosive solution, was analysed by SEM and FTIR spectra, as well as Raman spectroscopy. Scanning electron microscopy (SEM) and Raman spectroscopy confirmed the formation of protective films of the inhibitors on the steel surfaces. The effect of temperature on the corrosion rate and inhibition efficiencies were also determined, and it was found that as the temperature increased, that there was an increase in corrosion rate and decrease in inhibition efficiency.

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The authors declare no conflict of interest.

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The datasets used in this study are openly available at [repository link] and the source code is available on GitHub at [GitHub link].

This work did not receive any external funding.