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Zhang M.-j.,Xiangtan University | Zhang M.-j.,Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education | Pan Y.,Xiangtan University | Pan Y.,Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education | And 8 more authors.
Corrosion and Protection | Year: 2012

The steel-strip with nickel-cobalt coating was heat treated for 3 h at the temperatures of 550 °C, 650 °C and 750 °C. Electrochemical was used to test the corrosion resistance of nickel-cobalt coating on steel-strip in 1.0% NaCl and 0.1% H 2SO 4 mixed solutions and 10% NaOH solution before and after heat treatment. The morphology' composition and texture orientation of nickel-cobalt coating on steel-strip at different temperatures were studied by scanning electron microscopy (SEM) energy dispersive spectrometry (EDS) and X-ray diffraction (XRD). The results showed that with the increase of heat treatment temperatures' the grain size of nickel-cobalt coating increased correspondingly, a nickel-cobalt/iron diffusion layer between coating and substrate was formed. When the heat treatment temperature was 650 °C, the corrosion resistance of nickel-cobalt coating on steel-strip was the bett both in 1.0% NaCl-0.1% H2SO4 mixed solution and 10% NaOH solution, and then decreased when the temperature exceeded 650 °C, indicating that a suitable heat treatment temperature can improve the corrosion resistance of the coating.

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