Influence of aqueous sodium chloride solutions on operational properties of epoxy coatings

IF 2.2 3区工程技术 Q2 ENGINEERING, MULTIDISCIPLINARY Eksploatacja I Niezawodnosc-Maintenance and Reliability Pub Date : 2022-10-02 DOI:10.17531/ein.2022.4.4

D. Kotnarowska, Aleksandra Żabińska

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引用次数: 2

Abstract

The main goal of the research presented in the article is to assess the impact of the destruction (degradation) of epoxy coatings, caused by the influence of a 25% aqueous solution of sodium chloride (brine), on the operational properties that determine the coatings reliability (durability). Samples of two-layer epoxy coatings (obtained from powder paints) were aged by immersing them in brine for a maximum period of 1680 h. The following criteria were used to assess the operational properties of the coatings: thickness, roughness and surface morphology, hardness, water absorption (mass increase), surface free energy. The FTIR and DSC tests performed showed a progressive development of the oxidation processes of the epoxy with the ageing period. The long-term impact of the brine resulted in the destruction of the coatings in the form of: craters, grooves, microcracks, including silver cracks. The contact of the coatings with brine also increased their: surface roughness (Ra, Rz, Rmax), thickness, mass, surface free energy, and decreased hardness and heat resistance.

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氯化钠水溶液对环氧涂料使用性能的影响

本文研究的主要目的是评估25%氯化钠水溶液(盐水)对环氧涂料的破坏(降解)对决定涂料可靠性(耐久性)的操作性能的影响。两层环氧涂层样品(从粉末涂料中获得)通过将其浸泡在盐水中最长时间为1680小时进行老化。使用以下标准来评估涂层的操作性能:厚度，粗糙度和表面形貌，硬度，吸水率(质量增加)，表面自由能。FTIR和DSC测试表明，随着老化时间的延长，环氧树脂的氧化过程逐渐发展。盐水的长期影响导致涂层的破坏，形成坑洞、沟槽、微裂纹，包括银裂纹。涂层与卤水的接触增加了涂层的表面粗糙度(Ra, Rz, Rmax)、厚度、质量和表面自由能，硬度和耐热性降低。

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来源期刊

Eksploatacja I Niezawodnosc-Maintenance and Reliability ENGINEERING, MULTIDISCIPLINARY-

CiteScore

5.70

自引率

24.00%

发文量

审稿时长

3 months

期刊介绍： The quarterly Eksploatacja i Niezawodność – Maintenance and Reliability publishes articles containing original results of experimental research on the durabilty and reliability of technical objects. We also accept papers presenting theoretical analyses supported by physical interpretation of causes or ones that have been verified empirically. Eksploatacja i Niezawodność – Maintenance and Reliability also publishes articles on innovative modeling approaches and research methods regarding the durability and reliability of objects.