Abstract
Abstract Surface corrosion of the collector ring is an important factor that affects the current-carrying characteristics of the brush/ring system. A suitable surface film can effectively enhance the corrosion resistance of the surface and improve the tribological characteristics of the current-carrying ring. This paper focuses on the collector ring in the brush/ring current-carrying system of a hydrogenerator as the research object. Under the conditions of an anodic oxidation test with a current density of 0.004A/cm², optimized as the anodic oxidation technology, a surface film was formed by selecting oxidation times of 3, 5, 10, and 15 minutes (short duration, low current). The characteristics of the film were measured and analyzed using XPS, AFM, and SEM. Current-carrying tribological tests were conducted on a brush/ring current-carrying wear tester, and the relationship between surface film characteristics, polarization curves, and impedance spectra under different oxidation conditions was analyzed using an electrochemical device. The results show that, as oxidation time increases, the oxide film transitions from a dense barrier layer to a porous oxide film, with both the thickness of the oxide layer and the oxygen content in the film increasing. The wear mechanism evolves from "three-body" wear to "two-body" wear, and eventually to arc wear. An oxidation time of 10 minutes provides the best current-carrying performance, with a contact resistance of 1.118Ω and a friction coefficient of 0.2643. An oxidation time of 3 minutes offers the best corrosion resistance, with a maximum self-corrosion potential of -0.8784V and a minimum corrosion current density of 3.872×10⁻⁶A/cm². The anodic oxide film effectively protects the collector ring from external corrosive factors, extending its service life. Additionally, it reduces friction and contact resistance to some extent, ensuring the long-term stable operation of the equipment in harsh environments.
Published Version
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