CAJ | 학술논문

应用电化学阻抗谱(EIS)连续测试B95铝合金表面稀土转化膜在3.5%NaCl溶液中铈盐转化膜的破坏过程，通过阻抗值的变化研究B95铝合金表面稀土转化膜在3.5%NaCl溶液中的腐蚀行为，采用等效电路的方式对测试的EIS进行解析。通过转化膜腐蚀过程阻抗谱特征研究，建立了B95铝合金表面Ce(Ⅲ)转化膜腐蚀破环的3个阶段模型：浸泡早期、浸泡中期和浸泡后期。浸泡早期，铝合金表面稀土转化膜被电解质溶液湿润，水开始渗透进转化膜；浸泡中期，电解质溶液渗透转化膜被破坏，同时与转化膜自修复相互竞争，转化膜破坏/再钝化；浸泡后期，转化膜破坏超过转化膜自修复，铝合金基体开始逐渐腐蚀溶解。同时，该模型可以定量预测转化膜表面腐蚀发展的程度。
응용전화학조항보(EIS)련속측시B95려합금표면희토전화막재3.5%NaCl용액중시염전화막적파배과정，통과조항치적변화연구B95려합금표면희토전화막재3.5%NaCl용액중적부식행위，채용등효전로적방식대측시적EIS진행해석。통과전화막부식과정조항보특정연구，건립료B95려합금표면Ce(Ⅲ)전화막부식파배적3개계단모형：침포조기、침포중기화침포후기。침포조기，려합금표면희토전화막피전해질용액습윤，수개시삼투진전화막；침포중기，전해질용액삼투전화막피파배，동시여전화막자수복상호경쟁，전화막파배/재둔화；침포후기，전화막파배초과전화막자수복，려합금기체개시축점부식용해。동시，해모형가이정량예측전화막표면부식발전적정도。
The corrosion behavior of cerium(Ⅲ) conversion coating on B95 aluminum alloy in 3.5%NaCl solution was investigated by electrochemical impedance spectroscope (EIS). The process of corrosion and mechanism of cerium(Ⅲ) conversion coating on B95 aluminum alloy were investigated through the changes of EIS in the process. The tested EIS based on equivalent circuit was analyzed. The results show that the variation of EIS can clearly display the corrosion behavior change of cerium(Ⅲ) conversion coating on B95 aluminum alloy in 3.5%NaCl solution. Through investigating the EIS features, the respective model of each stage and its corresponding equivalent circuit were built to show the corrosion and destruction of the Ce(Ⅲ) conversion coating on B95 aluminum alloy. They are, respectively, the early stage, the middle stage and the terminal stage of immersion. The early stage refers to the time when the conversion coating on aluminum alloy is moisturized by electrolyte solution and water begins to permeate into the coating. The middle stage refers to the time when this permeation into the conversion coating is destructed while the conversion coating undergoes self-rehabilitation, thus giving rise to the competition between the destruction and self-rehabilitation of the conversion coating. The terminal stage refers to the time when the destruction of conversion coating outweighs its self-rehabilitation, the alloy begins to get corroded and resolved. This model can predict the corrosion degree of the conversion coating surface.