Effect of submicron Sn on wear resistance and scale resistance of Ni–P–Sn composite coating

Abstract

In this experiment, the microstructure and mechanical properties of Ni–P–Sn composite coatings with different Sn contents were observed by scanning electron microscope, optical contact angle measuring instrument, Vickers hardness tester and other experimental equipment. The effects of different Sn contents on wear resistance and scale resistance of Ni–P–Sn composite coatings were studied. The friction and wear properties of composite coatings with different Sn contents are tested and analyzed on friction and wear instruments, and the influence of Sn content on the scale resistance of composite coatings is analyzed through surface free energy and scale adhesion experiments. The results show that by measuring the hardness values of Ni–P– submicron Sn(2 g l−1) coating, Ni–P coating and Q235, it is found that the hardness value of Ni–P–Sn composite coating is the highest, 434.9 HV. At the same time, it is concluded that adding Sn to Ni–P composite coating is helpful to reduce the friction coefficient of the coating. The friction coefficient of Ni–P–Sn composite coating (6 g l−1) is 16.04% lower than that of the coating without Sn. When Sn content is 6 g l−1, the wear resistance is the best. When Sn content is 2 g l−1, the contact angle is 120.2° at the maximum. The minimum surface free energy is 15 MJ m−2. The dirt weight gain is the minimum value of 85 g m−2. At this time, the anti-fouling performance is the best.