This work aims to evaluate the performance of anticorrosive thermoplastic coatings in cold rolled steel sheets. Two types of thermoplastic coatings were studied: polystyrene (PS) and cornstarch. These types of coatings are applied for protection against corrosion during transport and storage of steel plates after cold rolling until delivery to stamping or other processing. The good performance for these coatings is suitably standardized to ABNT NBR 5915-2: 2013 and ASTM A1008 / A1008M-2016. According to corrosion tests carried out in saline chamber, the coatings were satisfactory in different degrees of guarantee of corrosion protection on ASTM 1080 steel, in accordance with standards mentioned.
-Effect of nickel-niobium coating by electrodeposition on the fatigue resistance of SAE 1020 carbon steel is studied in this work. The nickel-niobium coating was performed using a nickel Watts bath with added niobium powder. The specimens for fatigue tests were taken from SAE 1020 steel bar with 7.94mm (5/16 '') diameter. The fatigue tests were carried out by rotary bending load control with loading balance. It employed a rotation speed of approximately 1500rpm (25Hz). Vickers microhardness tests were performed on steel and deposited layer of nickel-niobium. Analysis of the electroplated layer connection interface in the steel and fatigue fractures were performed by scanning electron microscopy (SEM). The fatigue tests were performed in order to obtain S-N curves (Wöhler curves). It was observed that nickel-niobium coating gave only a tendency to increase the fatigue strength of the steel, although the coating layer has shown high hardness compared to the steel. The detachment of the deposited nickelniobium layer was regarded as the main cause of noncontribution of the increase in fatigue limit coated steel compared to the same in its original condition.
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