Atmospheric corrosion of metals in industrial city environment

Atmospheric corrosion is a significant problem given destruction of various materials, especially metals. The corrosion investigation in the industrial city environment was carried out during one year exposure. Corrosion potential was determined using the potentiometric method. The highest effect of corrosion processes was observed during the winter season due to increased air pollution. Corrosion of samples pre-treated in tannic acid before the exposure was more difficult compared with the samples without pretreatment. The corrosion products determined with the SEM/EDS method prove that the most corrosive pollutants present in the industrial city air are SO2, CO2, chlorides and dust

Novel dyed ethylene-norbornene composites with enhanced aging resistance

International audienceThe current research investigated the effects of anthraquinone solvent dyes and commercial stabilizers on the aging resistance properties of ethylene-norbomene (EN) composites subjected the aging in the full solar-spectrum for various time periods. During irradiation, the mechanical properties were measured bylaw and high degrees of deformation using dynamic mechanical analysis (DMA) and tensile tests until break, respectively. Changes in the color and surface defects in the investigated composites were evaluated using spectrophotometry and scanning electron microscopy (SEM). An accelerated aging test revealed that the application of solvent dyes with anthraquinone chromophores significantly prolonged the lifetimes of the EN composites during aging. The best improvement in durability was found in the EN samples that contained dyes, such as Solvent Blue 97, Solvent Blue 104, Solvent Blue and Solvent Green 28. Moreover, the ability of solvent dyes to protect EN composites against harmful effects of solar radiation was found to be much greater comparing to those of the investigated, commonly used stabilizers