摘要
彩色涂层钢板应用日趋广泛,但有机涂层与金属基体的附着机制尚不十分清楚。在湿热加速条件下,分别考察了彩涂板上环氧涂层、聚氨酯涂层和聚酯涂层的附着力,采用扫描电镜和红外光谱研究了湿热加速试验过程中有机涂层的表面结构和化学组成。结果显示,21 d湿热加速条件下涂层的附着力不同,聚氨酯和聚酯涂层的附着力明显好于环氧涂层;3种涂层的化学组成没有变化,但是涂层的表面缺陷变大,物理性阻挡作用减弱,环境中的腐蚀性介质更容易接触基体导致基板腐蚀,生成的腐蚀产物破坏了涂层和基体间的结合力,腐蚀面积扩大则更降低了附着力。
The adhesion of epoxy coatings, polyurethane coatings and polyester coatings to color coated steel sheets was evaluated under accelerated damp-hot condition. The changes in the surface structure and chemical composition of the organic coatings under accelerated damp-hot condition were analyzed by means of scanning electron microscopy and infrared spectrometry. It was found that different coatings showed different adhesion to substrate after 21 d of damp-hot test, and polyurethane coatings and polyester coatings possessed much better adhesion to substrate than epoxy coatings. The chemical composition of the three kinds of organic coatings kept unchanged after 21 d of damp-hot test. However, their surface defects were augmented,and physical blocking capacity was decreased. As a result, the corrosive media in environment were easier to access the substrate and cause corroaion, while the corroded products weakened the bonding between the coatings and substrate. As the corroded area increased, the adhesion of the coatings to substrate decreased.
出处
《材料保护》
CAS
CSCD
北大核心
2011年第8期26-27,68,共3页
Materials Protection
关键词
涂料
涂层
彩色涂层钢板
附着力
环氧
聚氨酯
聚酯
paint
coating
color coated steel sheet
adhesion
epoxy
polyurethane
polyester
