Some surface-active substances were tested as corrosion inhibitors of AA 6351aluminium alloy in 0.01 M NaCl under both free corrosion conditions and anodic polarization. The substances used were sodium salts of N-dodecanoyl-N-methylglycine (NLS), dodecylsulphate (LS), N-dodecanoyl-N-methyltaurine (NLT) and dodecyl-benzenesulphonate (DBS). The tests performed to measure the efficiencies of these substances and to study their inhibition mechanism (gravimetric measurements, electron probe-micro-analysis, potentiodynamic, potentiostatic and galvanostatic tests and electrochemical impedance spectroscopy) suggest that these substances act by adsorption on the aluminium surface oxide and displacement of adsorbed chloride ions. An attempt was made to explain the marked inhibiting properties shown by NLS.
Surface-active substances as inhibitors of localized corrosion of the aluminium alloy AA 6351
MONTICELLI, Cecilia;BRUNORO, Giancarlo;FRIGNANI, Alessandro;ZUCCHI, Fabrizio
1991
Abstract
Some surface-active substances were tested as corrosion inhibitors of AA 6351aluminium alloy in 0.01 M NaCl under both free corrosion conditions and anodic polarization. The substances used were sodium salts of N-dodecanoyl-N-methylglycine (NLS), dodecylsulphate (LS), N-dodecanoyl-N-methyltaurine (NLT) and dodecyl-benzenesulphonate (DBS). The tests performed to measure the efficiencies of these substances and to study their inhibition mechanism (gravimetric measurements, electron probe-micro-analysis, potentiodynamic, potentiostatic and galvanostatic tests and electrochemical impedance spectroscopy) suggest that these substances act by adsorption on the aluminium surface oxide and displacement of adsorbed chloride ions. An attempt was made to explain the marked inhibiting properties shown by NLS.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
