The inhibition of copper corrosion in cooling seawater by novel pyrophosphate SrNiP<inf>2</inf>O<inf>7</inf> (SNP) was investigated under flowing conditions using mass-loss and electrochemical methods. The surface morphology was characterized by SEM coupled with EDX spectra. Comparable results show that SNP acts as a mixed-type inhibitor with predominantly cathodic effectiveness, suppressing the corrosive process by physical adsorption on the copper surface. The highest inhibition efficiency obtained from mass-loss, polarization and EIS measurements are 92.7%, 94.8% and 97.1%, respectively, at 120 mg L<sup>-1</sup> of SNP. The influence of increasing temperature on SNP inhibitor efficiency has been studied, and the activation energy has been calculated. Surface morphology observations evidenced the formation of a protective SNP film over the metal surface.
ASJC Scopus subject areas
- Chemical Engineering(all)