Polymerised forms in the zirconium conversion coatings on cold-rolled steel: proof of concept

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

npj Materials Degradation Pub Date : 2024-06-18 DOI:10.1038/s41529-024-00485-3

Ana Kraš, Ingrid Milošev, Antoine Seyeux, Philippe Marcus

引用次数: 0

Abstract

This study validates the proposed polymerised structure, including tetrameric polynuclear species, of solid amorphous oxyhydroxide zirconium conversion coatings on cold-rolled steel using ToF-SIMS. Tetramers are formed at pH near 4 (and possibly higher), with thickness increasing over extended conversion times. EIS in simulated acid rain further demonstrates that optimal coating formation requires a pH of at least 4 and a sufficient conversion time for adequate thickness, confirmed by the high-frequency EIS loop. Tetramer forms were not observed when the coatings were prepared at lower pH or shorter conversion time, proving that the polymerisation step is crucial for obtaining the coatings offering adequate corrosion protection.

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冷轧钢板锆转化涂层中的聚合形式：概念验证

本研究利用 ToF-SIMS 验证了所提出的冷轧钢固态无定形氢氧化锆转化涂层的聚合结构，包括四聚体多核物种。四聚物在 pH 值接近 4（也可能更高）时形成，厚度随着转化时间的延长而增加。在模拟酸雨中进行的 EIS 进一步证明，最佳涂层形成需要至少 4 的 pH 值和足够的转化时间才能达到足够的厚度，这一点已被高频 EIS 循环所证实。在较低的 pH 值或较短的转化时间下制备涂层时，没有观察到四聚体形式，这证明聚合步骤对于获得具有足够腐蚀保护能力的涂层至关重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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