Aplication of Phenolic Acids in the Corrosion Protection of Al-0.8Mg Alloy in Chloride Solution

作者：Vrsalovic L^*; Kliskic M; Gudic S

来源：International Journal of Electrochemical Science, 2009, 4(11): 1568-1582.

• Al-0.8Mg alloy
• corrosion
• electrochemical techniques
• phenolic acids
• Freundlich adsorption isotherm

The inhibiting action of sinapinic and gentisic acid on Al-0.8Mg alloy in 0.5 mol dm(-3) NaCl solution was studied using potentiodynamic polarization method, linear polarization method, and electrochemical impedance spectroscopy measurements. Investigations were performed on a rotating disc electrode in a quiescent solution and at different electrode rotation rates and electrolyte temperatures. The results indicate that the investigated phenolic acids act as cathodic corrosion inhibitors for the Al-0.8Mg alloy, and the inhibition efficiency increases with increasing inhibitor concentration but decreases with increasing electrode rotation rate and electrolyte temperature. A mechanism of physical adsorption is proposed for the inhibition behaviour and the adsorption characteristics of the inhibitors were approximated by Freundlich adsorption isotherm.

• 出版日期2009-11