The synergistic effect of polyamidoamine dendrimers and sodium silicate on the corrosion of carbon steel in soft water

The corrosion inhibition properties of a combination of polyamidoamine dendrimers and sodium silicate for carbon steel in soft water has been examined and characterized by weight loss measurements, Tafel polarization, electrochemical impedance spectroscopy (EIS), energy-dispersive X-ray spectroscopy (EDS) and atomic force microscopy (AFM). The results show that this environmental friendly corrosion inhibitor at relatively low dosages had a good inhibition effect on the carbon steel corrosion in soft water. The adsorption of a combination of polyamidoamine dendrimers and sodium silicate obeys a Langmuir adsorption isotherm. Potentiodynamic polarization studies show that the corrosion inhibitor was a mixed inhibitor. EDS determined the nature of the adsorption layer on the steel surfaces, and AFM further confirmed the formation of a protective film on the carbon steel surface.