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首页> 外文OA文献 >Development of an advanced DC-polarisation/AC-impedance cyclic test to evaluate the corrosion of electrically-conductive coating/substrate systems
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Development of an advanced DC-polarisation/AC-impedance cyclic test to evaluate the corrosion of electrically-conductive coating/substrate systems

机译：开发先进的直流极化/交流阻抗循环测试，以评估导电涂层/基材系统的腐蚀

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In this work, an advanced (AC)DC/OCP/AC cyclic test regime has been developed (and validated experimentally) as a new tool for the evaluation of the corrosion behaviour of metallic substrates and/or electrically-conductive coatings. Incorporation of concurrent solution pH measurement with the advanced (AC)DC/OCP/AC technique developed in this work, qualifies this approach to be applied in different industrial applications, such as in aircraft, nuclear and biomedical sectors. It provides opportunities to evaluate objectively the detailed corrosion behaviour in shorter exposure times (as little as 1 day) compared to the widely-used and accepted (but highly subjective) salt spray test (SST) and to conventional (periodically repeated but laborious) electrochemical impedance spectroscopy (EIS) evaluation at open circuit potential (EOCP). udThe (AC)DC/OCP/AC cyclic test provides valuable information concerning the corrosion behaviour of uncoated Al 6082 alloy (repeat tests are performed, to eliminate test protocol variables and improve the robustness of the test). The three examples of prototype PVD Al-based nanostructured coatings (AlCr, AlCr(N) and AlCrTi), deposited on 17/4 PH steel, were then evaluated from a scientific perspective, to acquire a fundamental understanding of their performance and degradation with time. The results are shown in two main sets; i) electrochemical results obtained at EOCP and six repeated cycles of (AC)DC/OCP/AC cyclic testing and ii) solution pH results during continuous monitoring of the cyclic electrochemical test procedure. AlCrTi coating showed the best corrosion resistance after application of six successive DC/OCP cycles as a sacrificial protection for the substrate, followed by the AlCr(N) and AlCr coatings. However, the repassivation behaviour exhibited by the AlCr(N) coating after breakdown during extreme DC polarisation, may suggest an advantage to use this coating preferably in aerospace applications because of its strong ability to self-heal. This might be promising for future coating materials for corrosion protection where cadmium or hard chromium needs to be replaced. In addition, the structural and chemical composition of these samples was characterised using SEM and EDX analysis. Conventional open circuit potential (EOCP) and potentiodynamic polarisation scans were also employed, to determine the ‘as-received’ corrosion behaviour. udud
机译：在这项工作中，已经开发出了先进的（AC）DC / OCP / AC循环测试方案（并进行了实验验证），作为评估金属基材和/或导电涂层腐蚀行为的新工具。这项工作中开发的同时进行溶液pH测量与先进的（AC）DC / OCP / AC技术相结合，证明该方法可用于不同的工业应用，例如飞机，核能和生物医学领域。与广泛使用和接受（但主观性很高）的盐雾试验（SST）相比，与常规（定期重复但费力）的电化学试验相比，它提供了机会在较短的暴露时间（短至1天）内客观评估详细的腐蚀行为开路电势（EOCP）下的阻抗谱（EIS）评估。 ud（AC）DC / OCP / AC循环测试提供了有关未涂层Al 6082合金腐蚀行为的有价值的信息（执行重复测试，以消除测试规程变量并提高测试的稳定性）。然后从科学的角度评估了沉积在17/4 PH钢上的三个原型PVD铝基纳米结构涂层实例（AlCr，AlCr（N）和AlCrTi），以基本了解其性能和随时间降解。结果显示在两个主要集中； i）在EOCP和六个重复的（AC）DC / OCP / AC循环测试循环中获得的电化学结果，以及ii）在连续监测循环电化学测试程序期间的溶液pH结果。经过连续六个DC / OCP循环后，AlCrTi涂层表现出最佳的耐腐蚀性，作为对基材的牺牲保护，其次是AlCr（N）和AlCr涂层。然而，AlCr（N）涂层在极端DC极化过程中击穿后表现出的再钝化行为可能表明，由于其强大的自愈能力，优选在航空航天应用中使用该涂层是有优势的。对于将来需要更换镉或硬铬的防腐蚀涂料而言，这可能是有希望的。此外，使用SEM和EDX分析对这些样品的结构和化学组成进行了表征。还使用常规的开路电势（EOCP）和电势极化扫描来确定“按原样”腐蚀行为。 ud ud

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    Indeir Fahima;

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