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Corrosion and Corrosive Wear of Steel for Automotive Exhaust Application

Crescent Institute of Science and Technology-Tiruvannamalai Rajendra Prasad Tamilarasan
SRM Institute of Science and Technology-Raj Rajendran
Published 2019-10-11 by SAE International in United States
In the current scenario, durable exhaust system design, development and manufacturing are mandatory for the vehicle to be competitive and challenging in the automotive market. Material selection for the exhaust system plays a major role due to the increased warranty requirements and regulatory compliances. The materials used in the automotive exhaust application are cast iron, stainless steel, mild steel. The materials of the exhaust systems should be heat resistant, wear and corrosion resistant. Stainless steel is the most commonly used material in the automotive exhaust system. Due to increasing cost of nickel and some other alloying elements, there is a need to replace the stainless steel with EN 8 steel. Recent trends are towards light weight concepts, cost reduction and better performance. In order to reduce the cost and to achieve better wear and corrosion resistance, the surface of the EN 8 steel is modified with coatings. This work focuses on the evaluation of corrosion and corrosive wear resistance of hard chrome plating (HCP), hot dip aluminized coatings (HDA), spray aluminized coatings (SA), electroless nickel…
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Corrosion Study of NIP and NIP Composite Plated Piston Ring

Crescent Institute of Science and Technology-J Herbert Mabel
IP Rings Ltd-M Malathi, N Gowrishankar, A Vignesh
Published 2018-07-09 by SAE International in United States
Piston rings are used to seal the cavity formed between the piston and cylinder in order to allow the engine to operate efficiently. The Piston rings wear out due to constant rubbing action with cylinder wall and also have to withstand very high temperature. The top compression ring is the closest to combustion gases and is exposed to the greatest amount of chemical corrosion and highest operating temperature. This has lead to development of new coatings to piston ring with good wear and corrosion resistance. One such coating is Nickel Phosphorus (Ni-P) and Nickel Phosphorus composite coating (Ni-P SiC) used in automotive industry. Reinforcement of ceramic particle not only enhances the tribological property but also the corrosion resistance behavior. The electroplated Ni-P & Ni-P metal matrix with ultra-fine SiC particles of 0.6 microns to a coating thickness of 30 microns minimum. Our work aims to study the corrosion property of Ni-P with different range of phosphorus percentage and Ni-P reinforced with ultra-fine SiC particles with different weight percent (10, 50 and 100 gms/lt) using potentiostat…
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