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Research On Performance Of Al-Zn-In Series Sacrificial Anode With Fe Impurity

Posted on:2012-06-12Degree:MasterType:Thesis
Country:ChinaCandidate:G M JinFull Text:PDF
GTID:2131330335959560Subject:Materials Science and Engineering
Abstract/Summary:PDF Full Text Request
The aluminum alloy sacrificial anode materials are widely used in anti-corrosion engineering with low density, high current efficiency, good protection for metal structure without power supply, high quantity of electricity, avoided disturbing the neighbor metal facilities, and good current spreading ability, which is also easy to manage and preserve. Because of having no use for heat treatment and excellent comprehensive performance in the seawater, Al-Zn-In alloy become the most popular aluminum alloy sacrificial anode materials.Putting the impurity elements of Fe,Si and Cu into the sacrificial anode of Al-Zn-In, which keep the impurity elements of Si and Cu constant and the impurity elements of Fe content is 0.05%,0.10%,0.15% and 0.20%, respectively. The aluminum alloy sacrificial anode have been investigated by corrosion potential, polarization curve, electrochemical impedance, analysis of metallographic and EPMA, in different concentrations of seawater.The results of EPMA and metallographic show that the exhalation phase of Fe increases with the increasing of Fe element. The constant current experiment shows that when the content of Fe is 0.10%, the current efficiency has achieved the maximum. The content of Fe exceeds 0.10%, with the increasing of Fe element, exhalation phase of FeAl3 and micro cells constitued with Al substrate increase, the tendency of Hydrogen evolution rises, current efficiency decreases.Open potential and corrosion experimental results show that four samples in the same water concentration, with the increasing of the content of Fe, potential moved to the right sizing firstly and then to the negative potential. When the content of Fe is 0.10%, aluminum sacrificial anode has good thermodynamic stability.Constant potential experimental results show that, with the temperature increasing, corrosion constant current of the same sample, corrosion rate of anode increase, and corrosion tendency rise. Calculate the activation energy of four kinds of samples according to dynamic equation. It shows the sample with 0.10% Fe content and the activation energy reached 75.37kJ/mol has good hermodynamic stability.The aluminum anodes in the same water concentration, the anode polarization curve and electrochemical impedance results show that corrosion potential move to the right sizing firstly and then to the negative, the current density, the capacitive loops and Rp increase firstly and then decrease with the same potential. Sample with 0.10% Fe content has good anode polarization properties.
Keywords/Search Tags:Al-Zn-In alloy anode, The impurity element of Fe, Different concentrations of seawater, The electrochemical impedance
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