Tribological Performance of a Ni-Based Composite Coating in Artificial Seawater

Bo Li,Siyong Zhao,Hongjian Guo,Yimin Gao,Yunchuan Kang,Cong Li

doi:10.3390/coatings9110747

Bo Li, Siyong Zhao + Show 4 more

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https://doi.org/10.3390/coatings9110747

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Abstract

NiCrAlY and NiCrAlY-Mo coatings were fabricated by atmospheric plasma spraying (APS). The corrosion-wear performance of the coatings was investigated in artificial seawater and the synergistic mechanism between wear and corrosion were evaluated in detail. Results showed that the diffraction peaks of Ni3Al shifted to the right and the microhardness of the coating was improved from 329.8 HV to 342.5 HV with adding the Mo element. Meanwhile, the NiCrAlY-Mo coating had a lower friction coefficient, with a wear rate of 0.26 and 3.69 × 10−6 mm3/Nm, compared to the NiCrAlY coating with a wear rate of 0.37 and 4.67 × 10−6 mm3/Nm. The NiCrAlY coating had severe corrosion and the corrosion mainly occurred in grain boundary. Adding the Mo element, the Mo element was distributed in the grain boundary and the coating had a lower corrosion rate and visibly slighter corrosion. The NiCrAlY-Mo coating had excellent corrosion-wear properties in artificial seawater.

Highlights

With the rapid development of the social economy and the increasing depletion of land resources, it has been difficult to meet the needs of social development, so that the rich marine sources have attracted extensive attention from researchers [1,2]
In the process of friction, the passive film on the worn surface could be destroyed by friction force and the new passive film is hard to form, which is because the galvanic corrosion takes place at the interface of the passive film and the fresh surface [7,8]
The results showed that the NiCrAlY coating played an important protective role and effectively improved the lifetime of the engineering equipment [14]

Summary

Introduction

With the rapid development of the social economy and the increasing depletion of land resources, it has been difficult to meet the needs of social development, so that the rich marine sources have attracted extensive attention from researchers [1,2]. Marine equipment has played a significant role in marine exploration and development, such as offshore wind turbines, offshore platforms and ships. Marine equipment often directly corrodes in seawater and suffer the combined attack of corrosion and wear, which has a significant effect on the lifetime of the engineering components [3,4]. In the process of friction, the passive film on the worn surface could be destroyed by friction force and the new passive film is hard to form, which is because the galvanic corrosion takes place at the interface of the passive film and the fresh surface [7,8]. Hardness and roughness of the worn surface will be influenced by corrosion, thereby altering the wear process [3]

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