Influences Of Electro-polymerization Inhibitors On The Electrochemical Corrosion Behavior Of High-purity Aluminum Foil

Electrochemical corrosion of high-purity aluminum foil is related to electrode reactions of electrochemical cell, and it is mainly affected by electrode variables, external variables,mass transfer variables, electrical variables, and solution variables. In this paper, graphite and titanium were used as the counter electrode respectively to investigate the effects of inhibitors on the electrochemical corrosion behavior of high-purity aluminum foil based on the corrosion cell technology, in order to increase the capacitance and strength of the etched aluminum foil.Furthermore, mechanism of the electro-polymerization inhibition were studied to provide a theoretical basis in improving the electrochemical etching process.This paper used a variety of analytical detection methods to study the impacts of silane and aminophenol on the growth regularity of tunnels such as scanning electron microscopy,energy dispersive spectrometer, infrared spectra analysis, capacitance analysis, weight loss analysis, thickness analysis and so on. The inhibition effects of the two kinds of inhibitors were compared and analyzed. In addition, the effects of the electrode materials on etching current, length and density of etched tunnels and the inhibition process of aminophenol were studied.We had studied the inhibition impacts of silane KH-550, silane KH-560 and aminophenol on the corrosion behavior of high purity aluminum under the condition of corrosion cell system. And the inhibition effects of the three kinds of inhibitors were compared and analyzed from the following aspects: length and density of etching tunnels,capacitance, strength of etching aluminum foil etc. The results showed that after adding KH-550, KH-560 and aminophenol as the corrosion inhibitor, the capacitance of etched foil were increased by 7.14%, 17.50%, 26.19%, and the strength of etched foil were increased by21.90%, 35.25%, 46.67 %. In addition, when aminophenol was as the corrosion inhibitor, the density and length of etched foil was much better than the silane as the corrosion inhibitor.We had studied the effects of electrode materials on the corrosion behavior of highpurity aluminum foil under the condition of titanium alloy electrode system, including the effects on etching current,length and density of etched tunnels and the inhibition process ofaminophenol. The results showed that: Firstly, the density and length of tunnels had increased to some extent, and the distribution of tunnels was much more uniform when titanium alloy as the electrode, and the distance between the pair of titanium alloy electrodes had a significant effect on the density and length of tunnels, when the distance between the titanium alloy electrodes is 2 cm, the tunnel density was very large and tunnel length is long enough, but the corrosion on the surface of aluminum was more serious, and the serious corrosion on the aluminum surface was improved with the increasing of electrode distance,while the tunnel length and density was reduced with the increasing of electrode distance,when the distance between the electrodes is increased to 8 cm, although the tunnel density was very large, the tunnel length was very short,the growth of tunnels just stay on the aluminum surface, did not continue to grow in the depth, Therefore, the distance between the titanium alloy electrodes should not be too large or too small; Secondly, the etching current density is much higher when titanium alloy as the electrode, furthermore, the etching current reached the maximum value at the beginning of the reaction, and it decreased with the increasing of reaction time; And the distance between the pair of titanium alloy electrodes had a significant effect on the etching current, it decreased with the increasing of electrode distance;Thirdly, the etching current could be increased when the titanium alloy as the electrode,so the electro-polymerization process of aminophenol on the surface of aluminum foil was promoted, thus affecting its inhibition effect on the corrosion behavior of aluminum foil.