应用于 AA 7075-T651 全浸式铝锌、镁和镁/铝锌富金属底漆的空间分辨评估与分析

IF 3.1 4区 工程技术 Q2 ELECTROCHEMISTRY Journal of The Electrochemical Society Pub Date : 2024-09-17 DOI:10.1149/1945-7111/ad7535
A. Korjenic, E. Romanovskaia and J. R. Scully
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引用次数: 0

摘要

利用扫描振动电极技术(SVET)监测了三种富金属底漆(MRP)的局部腐蚀和基底保护情况。研究了在完全浸入 1 mM NaCl 的聚酰胺基环氧底漆涂层中使用富铝底漆 (AlRP)、富镁底漆 (MgRP) 或复合富镁 + 铝底漆 (MgAlRP) 对 AA 7075-T651 基材进行抑制局部腐蚀和提供广泛阴极极化以实现牺牲阳极阴极保护的能力。颜料在每种 MRP 中的活化程度并不一致。投掷功率极化裸基材以及划痕处电流和电位分布均匀的概念并不能描述所观察到的行为。在发生活化的情况下,裸 AA 7075-T651 上的局部阳极受到抑制,从而起到保护作用。在具有强局部阳极和阴极的异质腐蚀 AA 7075-T651 上,局部腐蚀被抑制。不存在广泛的阴极极化现象。与 AlRP 相比,MgRP 和 MgAlRP 能更好地抑制 AA 7075-T651 上与点蚀相关的局部腐蚀。
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Spatially Resolved Assessment and Analysis of Al-Zn, Mg, and Mg/Al-Zn Metal-Rich Primers Applied to AA 7075-T651 in Full Immersion
The scanning vibrating electrode technique (SVET) was utilized to monitor localized corrosion and substrate protection of three metal-rich primers (MRP). The ability to suppress localized corrosion and provide widespread cathodic polarization to enable sacrificial anode-based cathodic protection of a AA 7075-T651 substrate with either an aluminum-rich primer (AlRP), magnesium-rich primer (MgRP), or a composite magnesium + aluminum-rich primer (MgAlRP) in a polyamide-based epoxy primer coatings fully immersed in 1 mM NaCl was investigated. Pigments did not activate uniformly in each MRP. The notion of throwing power polarizing the bare substrate and uniform current and potential distributions at scratch sites does not describe the behavior observed. In cases where activation occurred, protection was noticed in the form of suppression of local anodes on bare AA 7075-T651. Local corrosion was suppressed on heterogeneously corroding AA 7075-T651 with strong local anodes and cathodes. Widespread cathodic polarization was absent. The MgRP and MgAlRP were shown to provide superior local corrosion suppression associated with pitting on AA 7075-T651 compared to the AlRP.
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来源期刊
CiteScore
7.20
自引率
12.80%
发文量
1369
审稿时长
1.5 months
期刊介绍: The Journal of The Electrochemical Society (JES) is the leader in the field of solid-state and electrochemical science and technology. This peer-reviewed journal publishes an average of 450 pages of 70 articles each month. Articles are posted online, with a monthly paper edition following electronic publication. The ECS membership benefits package includes access to the electronic edition of this journal.
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