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. 2023 Mar 17;15(6):1507.
doi: 10.3390/polym15061507.

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

Shijie Yu  1 , Jun Cao  1   2   3 , Shuxin Li  1 , Haibo Huang  1 , Xiaojie Li  1
Affiliations

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

Shijie Yu et al. Polymers (Basel). .

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.

Keywords: Ce2O3; dry sliding wear; oil lubrication; polymer coating; seawater corrosion; tribology.

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Conflict of interest statement

The authors declared no potential conflict of interest with respect to the research, authorship, and/or publication of this article.

Figures

Figure 1
Figure 1
Test conditions of tribological experiments. (a) dry sliding wear; (b) oil lubrication; (c) seawater corrosion.
Figure 2
Figure 2
XRD pattern of composite coatings.
Figure 3
Figure 3
Cross-sectional micromorphology of composite coatings. (a) T1.5 coating; (b) T2 coating; (c) T2.5 coating; (d) Enlarged image of (a); (e) Enlarged image of (b); (f) Enlarged image of (c).
Figure 4
Figure 4
EDS scan results of composite coatings. (a) T1.5 coating; (b) T2 coating; (c) T2.5 coating.
Figure 5
Figure 5
Hardness and elastic modulus of coating.
Figure 6
Figure 6
CoFs of the coatings under oil lubrication.
Figure 7
Figure 7
Wear marks of the composite coating under oil lubrication conditions. (a) T1.5 coating; (b) T2 coating; (c) T2.5 coating.
Figure 8
Figure 8
CoFs and wear amount under dry sliding wear. (a) Coefficient of friction; (b) Wear amount.
Figure 9
Figure 9
Wear marks of the composite coating under dry sliding wear. (a) T1.5 coating; (b) T2 coating; (c) T2.5 coating.
Figure 10
Figure 10
Friction coefficient and wear amount under seawater corrosion. (a) Coefficient of friction; (b) Wear amount.
Figure 11
Figure 11
Wear marks of the composite coating under seawater corrosion. (a) T1.5 coating; (b) T2 coating; (c) T2.5 coating.
Figure 12
Figure 12
The surface of the coating after 18 days immersed in seawater. (a) T1.5 coating; (b) T2 coating; (c) T2.5 coating; (d) T1.5 wear marks; (e) T2 wear marks; (f) T2.5 wear marks.
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