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ECHA European Chemical Agency (2015) Chromium VI Compounds—ANNEX XVII to REACH—Conditions of Restriction.

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• TITLE: Effectiveness of Sodium Silicate on the Corrosion Protection of AA7075-T6 Aluminium Alloy in Sodium Chloride Solution

  AUTHORS: Francesco Rosalbino, Giorgio Scavino, Graziano Ubertalli

  KEYWORDS: Aluminium Alloy 7075-T6, Silicate, Sodium Chloride, Electrochemical Impedance Spectroscopy (EIS), Scanning Electron Microscopy (SEM)

  JOURNAL NAME: Materials Sciences and Applications, Vol.15 No.4, April 15, 2024

  ABSTRACT: The influence of sodium silicate on the corrosion behaviour of aluminium alloy 7075-T6 in 0.1 M sodium chloride solution was studied by open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) techniques. Scanning electron microscopy (SEM) was used to characterize the AA7075-T6 surface. Silicate can significantly reduce corrosion deterioration and the inhibition efficiency increases with the concentration of Na2SiO3. The corrosion inhibition mechanism involves the formation of a protective film over the alloy surface by adsorption of aluminosilicate anions from solution, as has also been suggested by others in literature.