Abstract
Transition-metal nitride coating used to protect the electronic connector devices in marine environment is required to have high electrical conductivity and good corrosion resistance. This study synthesized a novel CrN–Pt coating with a dense growth texture. Pt addition induced a pronounced increase in electrical conductivity and corrosion resistance. The resistivity decreased from 0.0149 Ohm·cm in the CrN coating to 0.000472 Ohm·cm in the CrN–Pt coating, while the corrosion current density decreased from 24 nA/cm2 in the CrN coating to 6.3 nA/cm2 in the CrN–Pt coating. The results of the above studies confirm that Pt doping has significant advantages in improving the electrical conductivity and corrosion resistance of nitride coatings for potential applications in the marine environment.
Highlights
Electrical connector metals suffer from severe passivation reaction or galvanic corrosion when exposed to the marine environment
The potential effects of Pt doping on the growth structure, electrical conductivity and corrosion property of the chromium nitride (CrN) coating were studied by the detailed characterizations
The CrN–Pt coating shows a significant increase in corrosion resistance, which can likely be attributed to the dense growth texture and high chemical inertness of the doped Pt element
Summary
Electrical connector metals suffer from severe passivation reaction or galvanic corrosion when exposed to the marine environment. Transition-metal nitride coatings have high hardness, good chemical inertness and high resistance to wear and corrosion. These characteristics make them promising candidates for resisting severe tribocorrosion in marine environments [4–18]. In some harsh working environments, such as seawater, the corrosion resistance of CrN coatings does not meet requirements for long service life. The Pt element has high chemical inertness and good corrosion resistance, and Pt doping is expected to effectively enhance the corrosion resistance of CrN coatings. The potential effects of Pt doping on the growth structure, electrical conductivity and corrosion property of the CrN coating were studied by the detailed characterizations
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