Exhaust gas condensates corrosion test on low pressure cooling system of aluminum brazed EGR, WCAC and ACAC

摘要

New emission regulations require innovation in engine air loop. To satisfy these requirements, new architectures of cooling systems are in process of development. These systems use valves to regulate the exhaust gases pressure and distribution in the cooling loop and combustion chamber. Since lower pressure is involved in the Exhaust Gas Recycling (EGR), Water Charge Air Cooler (WCAC) or Air Charge Air Cooler (ACAC), the condensation of exhaust gases takes place and very acidic solutions are generated. In absence of such new architecture of cooling system in service and in order to evaluate the corrosion risk that the acidic solutions from exhaust gases condensates could create in the EGR system, several tests have been proposed as representatives for simulation of service conditions.