عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In the present study, effects of different percentages of ethanol as a gasoline additive on high temperature oxidation behaviors of cylinder head and valve alloys were investigated. A single-cylinder four-stroke engine was used to simulate the hot chamber of the cylinder environment. Samples were located within the exhaust pipe and were deposited with ethanol blended gasoline combustion gases under certain operating cycles. Then, in order to evaluate the oxide layer, the cross-section of samples were observed by the scanning electron microscopy (SEM) and to determine the amount of oxygen, the surface of samples was analyzed by the energy dispersive X-ray (EDX) technique. Obtained results exhibited that the thickness of the oxide film increased by increasing of ethanol percentages and engine operating cycles. The most porous film was belonged to steel in 15% ethanol-containing fuel with 60 operating cycles. The metal loss in steel specimens was significantly more due to the linear behavior of the steel oxidation.