| The oleic acid imidazoline ,acrylic acid imidazoline and sodium polyacrylate were synthesized and their structures were characterized by IR spectrum. The compounds included oleic acid imidazoline ,acrylic acid imidazoline ,polyethylene glycol and sodium polyacrylate's corrosion inhibition behaviors for aluminium foil in 2. 0 mol /L HCl solution were studied by gravimetric measurements, potentiodynamic polarization curves and EIS. The compounds'influences on specific capacitance of electron aluminium foil during DC etching were investigated by capacitance measuring instrument and SEM. We made some conclusions through experiment:When single HCl etching solution existed, the best experimental condition of DC etching process was that: the aluminum foil was washed in 1.5mol / L NaOH solution about 30s, etched in 2.0 mol / L HCl solution , current density controled at 0.2 A/cm2, corrosion temperature was 55℃, corrosion time was 150s.The two imidazoline compounds were both cathodic corrosion inhibitors and the two polymers were both mixed inhibitor for aluminium foil in 2.0 mol/L HCl solution. When the concentration of oleic acid imidazoline and acrylic acid imidazoline in etching solution reached 0.4 g/L and 0.6g / L, value of specific capacitance of the aluminum foil increased from 690.45μF/cm2 to 887.35μF / cm2 and 901.12μF / cm2 separately, increase amplitude reached 25%. Etching time when maximum value of specific capacitance appeared delayed from 150 s to about 210s. When the concentration of polyethylene glycol and sodium polyacrylate in etching solution reached 1.5g / L and 2.5g / L,the value separately increased to 986.11μF/cm2 and 1101.91μF/cm2 .When the four compounds were added , weight loss relatively decreased, tunnel density increased and well distributed, weight maintenance rate was improved .All of these were beneficial to deep processing and using of aluminum foil.
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