目的 探讨在阴极极化状态下,不同环境（静水、流动及含沙冲刷）中有机涂层的劣化与剥离行为。方法 采用碳钢DH36作为基材,醇酸防锈底漆作为涂层材料,利用旋转搅拌装置模拟不同环境条件。通过丝束电极技术和形貌表征分析方法,对阴极极化状态下的有机涂层进行宏观和微观观察,记录并分析其在不同环境下的劣化与剥离过程。结果 在静水、流动和含沙冲刷环境中,涂层在实验初期均会出现不同程度的劣化,主要表现为渗水鼓泡,且劣化初始位置具有随机性。涂层剥离主要围绕初始劣化位置扩展,静水、流动和含沙冲刷环境对涂层剥离的作用依次递增。流动状态的液体提高了涂层的吸水率,加速了涂层劣化;而在含沙冲刷环境中,沙砾的冲击磨损进一步降低了涂层的有效保护厚度,加速了涂层的剥离破坏。在相同实验周期内,静水、流动及含沙冲刷环境下的最大阴极电流密度依次递增,且电极的阴极电流密度主要受涂层表面状态的影响。结论 不同阴极极化状态下,有机涂层的劣化与剥离行为存在显著差异。流动和含沙冲刷环境对涂层的破坏作用更为显著,其中含沙冲刷环境对涂层的损伤最为严重。
Abstract
The work aims to explore the deterioration and delamination behavior of organic coatings in different environments (still water, flowing water, and sand erosion) under cathodic polarization conditions. With carbon steel DH36 as the substrate material, alkyd anti-rust primer was applied as the coating material. A rotating stirrer device was employed to mimic diverse environmental conditions. Macro and micro observations of the organic coatings under cathodic polarization were conducted using wire beam electrode technology and morphological characterization analysis methods to document and analyze their deterioration and delamination processes across different environments. The experimental findings revealed that, in still water, flowing water, and sand erosion environments, the coatings underwent varying degrees of deterioration, primarily manifested as water penetration and bubbling, during the initial stages of the experiment. The initial location of coating deterioration was random. The coating delamination primarily spread around the initial point of deterioration, with the impact of still water, flowing water, and sand erosion on coating delamination progressively increasing. Flowing water elevated the coating's water absorption rate and accelerated its deterioration. In sand erosion environments, the abrasive wear from sand particles further decreased the effective protection thickness of the coating, accelerating its delamination damage. Within the same experimental period, the maximum cathodic current densities in still water, flowing water, and sand erosion environments increased sequentially, and the cathodic current density of the electrode was predominantly influenced by the surface condition of the coating. In conclusion, there are significant differences in the deterioration and delamination behavior of organic coatings under different cathodic polarization conditions. Flowing water and sand erosion environments exert a more pronounced destructive influence on coatings, with sand erosion posing the most severe damage.
关键词
有机涂层 /
阴极极化 /
劣化剥离 /
丝束电极技术 /
流动环境 /
冲刷环境
Key words
organic coating /
cathodic polarization /
deterioration and delamination /
wire beam electrode technique /
fluid flow environment /
erosion environment
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基金
国家工信部高技术船舶科研项目（SSBQ-2020-HN-01-05）
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