The Effect of Surface Pretreatment of Aluminum Alloy 7075-T6 on the Subsequent Inhibition by Cerium(III) Acetate in Chloride-Containing Solution
The Effect of Surface Pretreatment of Aluminum Alloy 7075-T6 on the Subsequent Inhibition by Cerium(III) Acetate in Chloride-Containing Solution
复制标题
铝合金7075-T6表面预处理对含氯化物溶液中乙酸铈(III)后续抑制的影响
DOI：
10.1149/1945-7111/ac4933
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发表时间：
2022
影响因子：
3.9
通讯作者：
P. Rodič
中科院分区：
文献类型：
--
作者：
I. Milošev;P. Rodič
研究了表面预处理对7075-T6铝合金在氯化钠溶液中以醋酸铈为缓蚀剂的缓蚀性能的影响。测试了不同的表面预处理：（i）机械研磨，（ii）机械研磨和非水金刚石抛光，（iii）机械研磨，用NaOH进行碱性蚀刻和酸去污，以及（iv）机械研磨，用商业SurTec清洁剂进行碱性清洁和酸去污。采用光学显微镜、三维轮廓仪、扫描电子显微镜/能量色散X射线分析和傅里叶变换红外光谱法研究了浸泡过程中抑制表面的形貌、成分和形态。采用动电位法和电化学阻抗法研究了该材料在氯化钠溶液中的腐蚀性能。被抑制的表面的组成和形态的变化被注意到作为表面预处理和浸泡时间的函数。适当的表面处理，即使在长达1个月的长期浸泡后，也能改善对局部腐蚀的保护。在机械预处理中，抛光比研磨效果更好。在化学预处理中，在SurTec/HNO 3中的碱清洗比用NaOH的碱蚀刻更适合作为酸去污的前一步。
The study aimed to investigate the effect of surface pretreatment on the corrosion protection of aluminum alloy 7075-T6 in sodium chloride solution using cerium acetate as a corrosion inhibitor. Different surface pretreatments were tested: (i) mechanical grinding, (ii) mechanical grinding and non-water diamond polishing, (iii) mechanical grinding, alkaline etching with NaOH and acid desmutting, and (iv) mechanical grinding, alkaline cleaning with a commercial SurTec cleaner and acid desmutting. Topography, composition, and morphology of inhibited surface during immersion were investigated using optical microscopy, 3-D profilometry, scanning electron microscopy/energy-dispersive X-ray analysis and Fourier transform infrared spectrometry. The corrosion properties were determined by potentiodynamic measurements and electrochemical impedance spectroscopy in sodium chloride solution without and with the addition of cerium acetate. A change in the composition and morphology of the inhibited surface was noticed as a function of surface pretreatment and immersion time. Appropriate surface treatment resulted in improved protection against localized corrosion even after long-term immersion up to 1 month. Among mechanical pretreatments, polishing gave better results than grinding. Among chemical pretreatments, alkaline cleaning in SurTec/HNO3 was more appropriate as a preceding step to acid desmutting than alkaline etching with NaOH.