Mechanistic elucidation of the molecular weight dependence of corrosion inhibition afforded by polyetherimide coatings

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj Materials Degradation Pub Date : 2024-09-29 DOI:10.1038/s41529-024-00516-z

Tiffany E. Sill, Victor Ponce, Carlos Larriuz, Ron Chertakovsky, Caroline G. Valdes, Torrick Fletcher Jr, Jakob Nielsen, Kerry Fuller, Homero Castaneda, Rachel D. Davidson, Peter M. Johnson, Sarbajit Banerjee

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Abstract

Corrosion of critical metal components exacts a heavy toll in terms of maintenance and replacement costs and damage to ecosystems upon failure. Polymeric barrier coatings protect against corrosion; however, design principles for modulating polymer structure to improve corrosion inhibition remain contested and elusive. Here, we examine molecular-weight-dependent differences in the efficacy of corrosion inhibition on aluminum substrates afforded by polyetherimide (PEI) coatings. Analyses of coated substrates evidence a clear trend denoting improved corrosion inhibition for higher weighted-average molecular weight (MW) PEI. The more rigid and entangled macromolecular network of higher-MW variants exhibit stable impedance values, |Z|0.01 Hz ca. 1010 Ω/cm2, upon extended immersion in brine media, whereas lower-MW variants are readily hydrated and disentangled resulting in a significant reduction in impedance values. Results illuminate mechanistic understanding of molecular-weight-dependence in corrosion inhibition, advance a framework for considering the dynamical evolution of secondary structure, and exemplify generalizable design principles for corrosion inhibition.

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从机理上阐明聚醚酰亚胺涂层的缓蚀作用与分子量的关系

关键金属部件的腐蚀会造成重大损失，包括维护和更换成本，以及失效后对生态系统的破坏。聚合阻挡涂层可以防止腐蚀；然而，调节聚合物结构以改善缓蚀效果的设计原则仍然存在争议，难以捉摸。在此，我们研究了聚醚酰亚胺（PEI）涂层对铝基材的缓蚀效果随分子量而产生的差异。对涂层基材的分析表明，加权平均分子量（MW）较高的 PEI 具有明显的缓蚀效果。在盐水介质中长期浸泡后，高分子量变体的大分子网络更加坚硬和缠结，表现出稳定的阻抗值（|Z|0.01 Hz，约为 1010 Ω/cm2），而低分子量变体则很容易水化和分散，导致阻抗值显著降低。研究结果阐明了对缓蚀中分子量依赖性的机理理解，推进了考虑二级结构动态演变的框架，并体现了可推广的缓蚀设计原则。

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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