Electrochemical corrosion behavior of Ni-P, AlCrN and Ni-P-AlCrN multilayer composite coatings used on grounding grids

Authors

  • Chuansheng Luo

DOI:

https://doi.org/10.56028/aetr.1.1.11

Keywords:

Grounding grids, Ni-P alloy coating, AlCrN, Electrochemical corrosion.

Abstract

In this work, single NiP alloy, we use cathodic arc ion plating and electroless plating, AlCrN and NiP-AlCrN multilayer composite coatings were sedimented from the teeth outwards Q235 carbon steel. It is surface appearances of the coating that were inspected by using scanning electron microscope method (SEM) and the crystal structure, which was researched by the diffraction of X-ray (XRD). The electrochemical corrosion behaviors were evaluated by electrochemical polarization tests with electrochemical impedance spectrum (EIS). The results of EIS displayed that the impedance increased in the order Q235<AlCrN coating<NiP alloy<NiP-AlCrN composite coating. The corroded surfaces of coated samples were covered by some pitting while the surface of Q235 was totally destroyed.

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Published

2022-05-13 — Updated on 2022-05-18

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