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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Long-term atmospheric corrosion of aluminum alloy 2024-T4 in coastal environment: Surface and sectional corrosion behavior
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Long-term atmospheric corrosion of aluminum alloy 2024-T4 in coastal environment: Surface and sectional corrosion behavior

机译：沿海环境铝合金2024-T4长期大气腐蚀：表面和剖面腐蚀行为

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摘要

The surface and sectional corrosion behavior of anodized 2024-T4 exposed for 7 and 20 years was investigated. After 7 years of exposure, mild exfoliation corrosion had partially occurred. Pitting and intergranular corrosion (IGC) coexisted in the unexfoliation corrosion area. Due to the continuous formation of corrosion products beneath the surface and their difficulty in being transported through the IGC channel, surface blisters were eventually formed. After 20 years, severe exfoliation corrosion had occurred on the entire surface and cracked corrosion products were partly covered by filamentous corrosion products Al(OH)(3). The formation of filamentous corrosion products is the interaction between the ventilated environment, the long-term weathering, and the agglomeration of the Al(OH)(3) particles. Interestingly, most of the continuously corroded grain boundaries with severe IGC on the longitudinal section were parallel to the extrusion direction. The grain orientation, high precipitates continuity at grain boundaries and weak restraint of material itself to the expansion of IGC products are the reasons for this phenomenon by EBSD, SEM, TEM and mechanical analyses. (C) 2019 Elsevier B.V. All rights reserved.
机译：研究了阳极氧化的2024-T4暴露于7和20年的表面和截面腐蚀行为。经过7年的接触后，部分发生了温和的去角质腐蚀。在未炼形腐蚀区域中共存的点蚀和晶间腐蚀（IGC）。由于表面下方的腐蚀产品的连续形成及其难以通过IGC通道运输，最终形成表面衬里。 20年后，在整个表面上发生严重的剥离腐蚀，并且裂纹腐蚀产物部分覆盖丝状腐蚀产品Al（OH）（3）。丝状腐蚀产物的形成是通风环境之间的相互作用，长期耐候和Al（OH）（3）颗粒的凝聚。有趣的是，纵向截面上具有严重IGC的大部分连续腐蚀的晶界与挤出方向平行。晶粒取向，高沉淀在晶界的连续性和材料本身的弱抑制因IGC产品的扩张是通过EBSD，SEM，TEM和机械分析的这种现象的原因。 （c）2019 Elsevier B.v.保留所有权利。

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