冷喷涂铝合金2024和7075局部腐蚀的萌生和扩展

IF 1.1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Pub Date : 2023-04-28 DOI:10.5006/4239

Mun-Chul Kim, L. Brewer, G. Kubacki

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引用次数: 1

摘要

本文研究了2024和7075冷喷铝合金镀层局部腐蚀的萌生和扩展。在AA2024-T351和AA7075-T651基底上的CS沉积物是用市售的AA2024和AA7085粉末使用氦气作为载气制备的。采用0.6M NaCl中的电化学和浸渍试验以及ASTM G110试验来评估CS AA2024和AA7075沉积物的腐蚀性能。为了进行分析，在实验前后使用光学显微镜（OM）、扫描电子显微镜（SEM）、能量色散X射线光谱（EDS）和X射线衍射（XRD）。结果表明，局部腐蚀的萌生和传播在很大程度上取决于微观结构特征，如金属间网络与基体的分布和化学成分，并沿着这些网络和先前的颗粒边界传播，其中存在超细晶粒（UFG）结构。加速局部腐蚀试验产生了深穿透以及由于裂纹聚结而产生的大面积缺陷。

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Initiation and Propagation of Localized Corrosion on Cold Sprayed Aluminum Alloy 2024 and 7075

This paper investigates the initiation and propagation of localized corrosion on cold sprayed (CS) aluminum alloy 2024 and 7075 deposits. CS deposits on AA2024-T351 and AA7075-T651 substrates were produced with commercially available AA2024 and AA7075 powders using helium as carrier gas. Electrochemical and immersion tests in 0.6M NaCl and ASTM G110 test were employed to evaluate the corrosion properties of CS AA2024 and AA7075 deposits. For analysis, optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) were utilized before and after the experiment. The results indicated that the initiation and propagation of localized corrosion highly depend on microstructural characteristics, such as the distribution and chemical composition of intermetallic networks with the matrix and propagated along these networks and prior particle boundaries, where an ultrafine grain (UFG) structure is present. Accelerated localized corrosion tests generated deep penetration as well as a large area of defects owing to the coalescence of fissures.

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来源期刊

Corrosion MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING

CiteScore

2.80

自引率

12.50%

发文量

审稿时长

3 months

期刊介绍： CORROSION is the premier research journal featuring peer-reviewed technical articles from the world’s top researchers and provides a permanent record of progress in the science and technology of corrosion prevention and control. The scope of the journal includes the latest developments in areas of corrosion metallurgy, mechanisms, predictors, cracking (sulfide stress, stress corrosion, hydrogen-induced), passivation, and CO2 corrosion. 70+ years and over 7,100 peer-reviewed articles with advances in corrosion science and engineering have been published in CORROSION. The journal publishes seven article types – original articles, invited critical reviews, technical notes, corrosion communications fast-tracked for rapid publication, special research topic issues, research letters of yearly annual conference student poster sessions, and scientific investigations of field corrosion processes. CORROSION, the Journal of Science and Engineering, serves as an important communication platform for academics, researchers, technical libraries, and universities. Articles considered for CORROSION should have significant permanent value and should accomplish at least one of the following objectives: • Contribute awareness of corrosion phenomena, • Advance understanding of fundamental process, and/or • Further the knowledge of techniques and practices used to reduce corrosion.