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Farfan-Cabrera, Leonardo
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Crevice Corrosion Accelerated Test for Cylinder Head/Gasket/Monoblock Assemblies from Lightweight Engines Exposed to Overheating Cycles

Instituto Politecnico Nacional Esime Zac-Gerardo Rodríguez-Bravo, Roberto Vega-Moron
Instituto Politécnico Nacional ESIQIE-Jesús Godínez-Salcedo
  • Technical Paper
  • 2020-01-1067
To be published on 2020-04-14 by SAE International in United States
Severe crevice corrosion occurring at the joint of cylinder head/gasket/mono-block from lightweight engines causes accelerated dissolution of lightweight material, in particular, in cylinder head producing the linking of the cooling vessels with the combustion chambers or oil vessels. It is conductive to combustion of coolant or oil, and contamination of oil with coolant or vice versa, which is considered as catastrophic engine failure. Since crevice corrosion is dependent of many of the actual assembly characteristics, coolant and engine operation conditions, full-scale tests are the most frequent alternative for this type of evaluations. Nonetheless, they are very long and expensive, and sometimes, unreliable tests. Alternatively, the standard procedure ASTM-G78 is widely used to evaluate crevice corrosion propensity of different metallic materials under certain specified conditions trough immersion tests in a corrosive media in shorter test times. However, the method does not cover the characteristics and conditions existing at the cylinder head/gasket/mono-block joint. Hence, this paper presents an accelerated test consisting on three-electrode cyclic potentiodynamic anodic polarization and polarization resistance standard trials using special assembly samples to…
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Three-Body Abrasion Study of a Dynamic Seal by a Micro-Scale Abrasion Test under Lubricated Conditions

Instituto Politecnico Nacional Esime Zac-Leonardo Farfan-Cabrera, Ezequiel A. Gallardo
Published 2016-04-05 by SAE International in United States
Debris are progressively generated just after wear occurred by the interaction of various mechanical elements inside the engines, steering gear boxes, transmissions, differentials, etc. Besides, debris could interfere with the normal operation of such components generating even more damage in other parts due to three-body abrasion. Hence, dynamic seals are susceptible to interact with very fine debris accumulated in the working lubes. Recently, owing to many test advantages, the micro-scale abrasion test has been extensively used to reproduce three-body abrasion in hard materials, coatings, polymers, etc., however, it has not been before employed for the wear assessment of elastomeric materials. This paper presents an adaptation of the micro-scale test method to study three-body abrasive behavior of an elastomeric dynamic seal (samples extracted from an automotive commercial Acrylonitrile-butadiene NBR rotary seal) under lubricated conditions. This work looks generate three-body abrasion on the NBR material, proposing a range of test conditions (Load, sliding speed, sliding distance and abrasive concentration) and quantify the volume loss. Engine lubricant contaminated with SiC micro-particles was used toward replicating the actual seal…
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