摘要
对镀镍钴钢带进行不同温度的热处理,热处理温度为550℃、650℃、750℃,保温时间3h。采用电化学方法测试了不同热处理温度下镀镍钴钢带在1.0%NaCl和0.1%H2SO4混合溶液及10%NaOH溶液中的耐腐蚀性能,并通过扫描电子显微镜(SEM)、能谱分析仪(EDS)和X射线衍射仪(XRD)分析了镀镍钴钢带在不同热处理温度下的微观形貌、成分及织构变化。结果表明,随着热处理温度的升高,镀镍钴钢带表面镀层的晶粒尺寸逐渐长大,镀层和基底间形成了镍/钴/铁扩散层;当热处理温度为650℃时,镀镍钴钢带在1.0%NaCl和0.1%H2SO4混合溶液及10%NaOH溶液中的耐腐蚀性能均为最好的,当热处理温度超过650℃后其耐腐蚀性能降低。这说明合适的热处理温度能有效地提高镀层的耐腐蚀性能。
The steel-strip with nickel-cobalt coating was heat treated for 3 h at the temperatures of 550 °C, 650 °C 1 and 750 °C. Electrochemical was used to test the corrosion resistance of nickel-cobalt coating on steel-strip in 1.0% NaC1 and 0. 1% H2 SO4 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 best both in 1.0%NaC1-0. 1% HzSO4 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.
出处
《腐蚀与防护》
CAS
北大核心
2012年第4期269-272,319,共5页
Corrosion & Protection
基金
国家自然科学基金(No.11002121)
湖南省科技重大专项(No.2009FJ1002)
关键词
热处理温度
镍钴合金
耐腐蚀性能
heat treatment temperature nickel-cobalt alloy corrosion resistance
