ABSTRACT

Poly(ethylene terephthalate) (PET) powder obtained from post-consumer bottles is deposited on carbon steel by using a hot mechanical pressing method. The PET coated steels are aged in weathering chambers by using a xenon lamp for 400 and 1500 h, and using ultraviolet (UV-B) lamps for 400 h. The aged PET coatings are analysed by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and the photodegradation mechanism is discussed. The corrosion evaluation of aged PET coated steels is performed by using the electrochemical impedance spectroscopy in a saline medium. FTIR-ATR analysis of the aged coating indicates that the UV-B test chamber is more aggressive to PET coatings than the WO chamber test. After 400 h of weathering aging, PET coated steels exposed in a chamber with the xenon radiation show a higher corrosion resistance than the PET coated steel aged using the UV-B test.

摘要

从消费后的瓶子中获得的聚对苯二甲酸乙二酯（PET）粉末通过热机械挤压法沉积在碳钢上。使用氙气灯分别在400和1500小时内以及使用紫外线（UV-B）灯持续400小时，在风化室中对PET涂层钢进行时效处理。通过傅立叶变换红外光谱（FTIR），扫描电子显微镜（SEM）对老化的PET涂层进行了分析，并讨论了其光降解机理。老化的PET涂层钢的腐蚀评估是通过在盐介质中使用电化学阻抗谱进行的。老化涂层的FTIR-ATR分析表明，与WO室测试相比，UV-B测试室对PET涂层更具腐蚀性。风化老化400小时后，