The Tribological and Mechanical Properties of PI/PAI/EP Polymer Coating under Oil Lubrication, Seawater Corrosion and Dry Sliding Wear

Abstract

To investigate the tribological performance of a copper alloy engine bearing under oil lubrication, seawater corrosion and dry sliding wear, three different PI/PAI/EP coatings consisting of 1.5 wt% Ce2O3, 2 wt% Ce2O3, 2.5 wt% Ce2O3 were designed, respectively. These designed coatings were prepared on the surface of CuPb22Sn2.5 copper alloy using a liquid spraying process. The tribological properties of these coatings under different working conditions were tested. The results show that the hardness of the coating decreases gradually with the addition of Ce2O3, and the agglomeration of Ce2O3 is the main reason for the decrease of hardness. The wear amount of the coating increases first and then decreases with the increase of Ce2O3 content under dry sliding wear. The wear mechanism is abrasive wear under the condition of seawater. The wear resistance of the coating decreases with the increase of Ce2O3 content. The wear resistance of the coating with 1.5 wt% Ce2O3 is the best under-seawater corrosion. Although Ce2O3 has corrosion resistance, the coating of 2.5 wt% Ce2O3 has the worst wear resistance under seawater conditions due to severe wear caused by agglomeration. Under oil lubrication conditions, the frictional coefficient of the coating is stable. The lubricating oil film has a good lubrication and protection effect.

Effect of ABS Content on Thermal Stability, Tensile Strength, Friction, and Wear of PMMA/ABS blends

“…Figure 8 shows the wear morphologies of the PMMA, ABS, and PMMA/ABS blends with different ABS contents. In Figures 8a and b, the PMMA has an apparent wear track on which ploughed furrows resulted from abrasive wear and plastically deformed layers (plastic flow) formed by the sliding of the steel ball are found [7,22,23]. In Figures 8c and d, the PMMAABS10 has a smaller wear track than the PMMA, confirming that it has the higher abrasive wear resistance.…”

“…Besides, the repeated sliding of the steel ball on the PMMAABS70 surface generates wear debris and ploughed furrows on its wear track via abrasive wear. [22,23]. The repeated dry sliding of the steel ball initiates minute cracks in the subsurface region, propagates them parallel to a free surface to some extent, and eventually leads to a removal of surface materials as platelets [24,25].…”

“…In Figures 8g and h, the ABS has a largest wear track among the samples used in this study due to its lowest wear resistance associated with its lowest mechanical strength. The formation of plastically deformed layers is most apparently found on the wear track of the ABS while the most obvious ploughed furrows on its wear track can be related to its lowest abrasive wear resistance [7,22,23]. The highest wear of the ABS generates the largest amount of wear debris which are subsequently compacted by the repeated sliding of the steel ball to densely form tribolayers on its wear track while the detachment of thickened tribolayers is apparently found [26,27].…”

Double-Layer Superhydrophobic Coating: Enhanced Anti-Corrosion and Anti-Fouling Resistance through Star Cross-linking of FPI/POSS@POA/F-SiO 2

“…Research indicates that coatings incorporating POSS polymers possess self-lubricating and abrasionresistant properties [35]. This distinctive advantage positions POSS as a valuable component in anticorrosion and anti-fouling coatings.…”