The effect of variable humidity on corrosion fatigue of AA7085-T7451 with surface salt deposits

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY npj Materials Degradation Pub Date : 2024-11-01 DOI:10.1038/s41529-024-00530-1

Brandon Free, Gabriella C. Montiel, Gabriella A. Marino, Eric Schindelholz, Sarah Galyon Dorman, Jenifer S. Warner Locke

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Abstract

Corrosion fatigue (CF) crack growth is quantified as a function of relative humidity (RH) using AA7085-T7451 samples with NaCl deposited to understand the effect of deliquesced surface electrolyte droplets on CF performance when humidity varies. Fracture mechanics testing holding mechanical driving forces for cracking constant and incrementally increasing humidity show that crack growth rate (da/dN) more than doubles once RH moves above 78–80% RH. When decreasing RH, some amount of drying below the efflorescence RH (ERH) and/or a sufficient time is needed to pass in order for da/dN to return to that expected for a dry crack tip. All in all, this study establishes time of crack tip wetness as an important parameter for predicting fatigue lifetimes in atmospheric conditions, a parameter that cannot be solely predicted by RH, as accelerated cracking can continue for a limited amount of time even when RH is brought below the ERH.

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湿度变化对表面盐沉积 AA7085-T7451 腐蚀疲劳的影响

使用沉积了氯化钠的 AA7085-T7451 样品，对腐蚀疲劳 (CF) 裂纹增长与相对湿度 (RH) 的函数关系进行了量化，以了解湿度变化时潮解表面电解质液滴对 CF 性能的影响。断裂力学测试表明，当相对湿度超过 78-80% RH 时，裂纹增长率（da/dN）会增加一倍以上。在降低相对湿度时，需要在一定程度上干燥到低于渗出相对湿度（ERH）和/或足够长的时间后，da/dN 才能恢复到干燥裂缝尖端的预期值。总之，这项研究确定了裂纹尖端潮湿时间是预测大气条件下疲劳寿命的一个重要参数，而这一参数不能仅由相对湿度来预测，因为即使相对湿度低于 ERH，加速开裂也会持续有限的时间。

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来源期刊

npj Materials Degradation MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

7.80

自引率

7.80%

发文量

审稿时长

6 weeks

期刊介绍： npj Materials Degradation considers basic and applied research that explores all aspects of the degradation of metallic and non-metallic materials. The journal broadly defines ‘materials degradation’ as a reduction in the ability of a material to perform its task in-service as a result of environmental exposure. The journal covers a broad range of topics including but not limited to: -Degradation of metals, glasses, minerals, polymers, ceramics, cements and composites in natural and engineered environments, as a result of various stimuli -Computational and experimental studies of degradation mechanisms and kinetics -Characterization of degradation by traditional and emerging techniques -New approaches and technologies for enhancing resistance to degradation -Inspection and monitoring techniques for materials in-service, such as sensing technologies