Abstract
The national demand for biodiesel is growing considerably and studies have been able to prove that biodiesel presents itself able to trigger corrosive processes on metal parts. This study aims to evaluate the SAE 1020 carbon steel corrosion rate by weight loss after accelerated aging in soybean biodiesel samples (B100) and in diesel with the addition of 5% biodiesel (B5 S500) at storage temperature (25°C) and engine operating temperature (100°C), for a period of 10 consecutive days. The SAE 1020 carbon steel specimens (12.5 x 75 x 3mm) were taken from the same steel plate, sanded, cleaned and degreased sequentially with alcohol 98% and 100% acetone and submitted to ultrasonic bath in 100% acetone for 180 seconds. After the corrosion test at 25°C and 100°C, it was observed the formation of deposits corrosion in SAE 1020 carbon steel blades, in the cases of soybean biodiesel samples (B100) and diesel (B5 S500). After the test at 100°C, it was also observed a color change, in the case of soybean biodiesel samples (B100). The SAE 1020 carbon steel corrosion rate, subjected to soybean biodiesel (B100) and diesel (B5 S500), increased with temperature, being more pronounced in the specimens subjected to corrosion tests with soybean biodiesel (B100).
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