Wear Characteristics of Ductile Cast Iron Crankshaft Coating

摘要

The ductile cast iron crankshaft provides an effective alternation to grey cast iron crankshaft in the rotary compressor. In this research, several manganese (Mn) phosphate coatings and molybdenum disulfide (MoS_2) coatings of ductile cast iron crankshaft are studied compared to grey cast iron crankshafts. The coating surface was observed with Scanning Electron Microscope (SEM) and analyzed with Energy Dispersive X-ray Spectroscopy (EDX). In the scratch test, the critical load characterizing the coating scratch resistance was measured by Micro-Tribometer with electrical contact resistance (ECR) measurements mainly. In the wear test, the friction coefficient and wear life was evaluated by Micro-Tribometer. As the results, we developed the technology of Mn phosphate coating and M0S2 coating of ductile cast iron crankshaft with higher adhesion and wear characteristics.