Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: The failure process of two composite coatings: epoxy-antirust primer/ epoxy-MIO (micaceous iron oxide)/acrylic polyurethane (P1) and epoxy-antirust primer/ chlorinated rubber (P2) in 3.5%(mass fraction) NaCl solution at 60 ℃ was investigated by electrochemical impedance spectroscopy. The variation of EIS Bode plot, electrical resistance, high-frequency capacitors and characteristic frequency of the coatings was monitored and analyzed. Results showed that: in the early immersion period, low-frequency impedance and coating resistance decreased rapidly, but they declined slowly in the later immersion period and fluctuated in a small range in the mid-term. In addition, high-frequency capacitance and characteristic frequency increased slowly in the early immersion period and increased rapidly in the later immersion period, in the mid-term, they also fluctuated in a small range.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: none
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract: A nickel-based (Ni0) composite coating, which was reinforced with 20%WC and 6% graphite particles and has a texture-like section morphology, was fabricated on steel substrate by vacuum cladding technology. Then its microstructure and tribological property under dry friction condition were characterized in comparison with other three coatings (Ni0, Ni0+20%WC and Ni0+6% graphite). The results show that the WC particles evenly distributed in the nickel-based (Ni0) alloy coatings and formed a special 3D reticular microstructure. The Ni-based alloy coating is mainly composed of γ-Ni solid solution, hard phases (Cr7C3, Cr23C6, CrB) and eutectic phases (Ni3Si, Ni3B). The cladd composite coating consisted of Ni0 with WC and graphite particles exhibits the highest wear resistance among the test coatings. The combination of texture-like structure (which was composed of WC particles and nickel base alloy) and graphite lubricant promoted the abrasion resistance of the composite coating by about 9.6 times in comparison to the pure Ni0 coating.