Work

Unveiling the Corrosion Mechanism of the NixSey Intermetallic Compound in Water-Based Solution

Year: 2024

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide In this study, Ni–Se intermetallic compound coatings were fabricated using electrodeposition at various process temperatures (40–70 °C). The results show that increasing the process temperature promotes the deposition of Se, which leads to a transition in the crystal phase of the samples from the Ni 0.85 Se phase, prepared under low-temperature conditions, to a NiSe 2 phase. The dissolution rate of Se in pure water from Ni–Se coatings is inversely related to the incorporated Se content, which indicates that the Ni 0.85 Se phase has a higher natural corrosion rate compared to the NiSe 2 phase. Under the influence of an electric field, the corrosion behavior of Ni–Se coatings is dominated by a two-stage reaction involving Se transformation and dissolution. Coatings with a predominant Ni 0.85 Se phase exhibit more severe corrosion behavior compared to those with a predominant NiSe 2 phase, which suggests that the corrosion reaction is enhanced by the electric field. However, because coatings with a predominant NiSe 2 phase contain a higher proportion of Se 2 2– ions, the dissolution reaction of SeO x, generated during the electrochemical reaction, is retarded, thereby inhibiting the progression of the corrosion reaction. Consequently, coatings with a predominant NiSe 2 phase exhibit relatively better corrosion resistance in a water-based electrolyte.

Source: ACS Applied Materials & Interfaces

DOI: 10.1021/acsami.4c13794

Authors: Jui-Teng Liang, Hwai-En Lin

Institution: National Taipei University of Technology

Language: English

Topic: Electrodeposition and Electroless Coatings

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,500

Funder: National Science and Technology Council