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In this work, we examined the relationship between the anticorrosion behavior and the structure of the cysteamine/ l -cysteine layer-by-layer coating on the copper surface via the self-assembled monolayers (SAMs) technique with electrochemistry and surface-enhanced Raman scattering (SERS) spectroscopy. SERS results elucidated the layer-by-layer adsorption mechanism of cysteamine/ l -cysteine at the copper surface. Electrochemical investigations explored the inhibition behavior of cysteamine/ l -cysteine for copper from corrosion with a high protection efficiency of 91.4%.

The adsorption and corrosion protection effect of phytic acid calcium (PAC) film on the copper surface in 3 wt% NaCl solution was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and Raman spectroscopy. Polarization curves indicate that PAC is a mixed inhibitor, affecting both cathodic and anodic corrosion currents. The inhibition efficiency of PAC film reached 92.53% at an optimized condition. Adsorption of PAC molecules on the surface followed Langmuir adsorption isotherm and the standard Gibbs energy of −37.32 kJ mol−1 indicated a chemisorptive way. Raman studies suggested that PAC molecule chemically anchored at the surface via P O groups.