用动电位和静电位腐蚀分析法研究了两种特定的Ni-Cr-Mo-B合金粉末高速氧燃料气(HVOF)喷涂涂层在0.5 M H_2SO_4中的腐蚀特性。采用X-射线衍射(XRD),扫描电子显微镜,二者均采用二次电子(SE)和背反射电子(BE)两种模式、和透射电子显微镜(T...用动电位和静电位腐蚀分析法研究了两种特定的Ni-Cr-Mo-B合金粉末高速氧燃料气(HVOF)喷涂涂层在0.5 M H_2SO_4中的腐蚀特性。采用X-射线衍射(XRD),扫描电子显微镜,二者均采用二次电子(SE)和背反射电子(BE)两种模式、和透射电子显微镜(TEM)研究了涂层的显微组织特性。 两种合金显微组织的检验结果表明,含有亚微晶硼化物沉淀相的非晶/微晶(fcc)基体和转变为板条状马氏体组织的区域占主导地位,还发现以具有fcc结构多孔性晶粒形式发生的明显的非晶态基体的再结晶。发现了在薄层的边界之间观察到的氧化物细束是柱状结晶的α-Cr_2O_3,但也观察到具有球状形态的NiCr_2O_4尖晶石氧化物区。 象动电位试验所揭示的那样,两种合金的涂层在0.5 M H_2SO_4中具有可比的抗腐蚀性能。两种合金涂层的静电位约为-300 mV(SCE),钝化区的电流密度约为 1mA/cm^2,静电位腐蚀试验之试样的显微组织检验表明,薄层边界普遍损坏,尤其是沉积层发生了显著氧化的涂层试样的薄层边界。展开更多
The Fe40Al-xWC(x=0,10,12,15)coatings with dense structure were successfully deposited by high-velocity oxygen fuel (HVOF)spraying of a mixture of Fe,Al and WC powders.The objective of the present work is to provide in...The Fe40Al-xWC(x=0,10,12,15)coatings with dense structure were successfully deposited by high-velocity oxygen fuel (HVOF)spraying of a mixture of Fe,Al and WC powders.The objective of the present work is to provide insight into the oxidation behavior of the as-deposited coatings at 650℃under 0.1 MPa flowing pure O2.The present results show differences in the oxidation behavior of Fe40Al coating and Fe40Al-xWC composite coatings.The irregular Fe2O3 layer is seen on the top surface of the composite coatings.Fe40Al coating and Fe40Al-15WC composite coating both suffer a catastrophic corrosion due to the formation of a porous structure during 24 h of oxidation.However,Fe40Al-10WC and Fe40Al-12WC composite coatings show a good oxidation resistance behavior due to their dense structure.展开更多
文摘用动电位和静电位腐蚀分析法研究了两种特定的Ni-Cr-Mo-B合金粉末高速氧燃料气(HVOF)喷涂涂层在0.5 M H_2SO_4中的腐蚀特性。采用X-射线衍射(XRD),扫描电子显微镜,二者均采用二次电子(SE)和背反射电子(BE)两种模式、和透射电子显微镜(TEM)研究了涂层的显微组织特性。 两种合金显微组织的检验结果表明,含有亚微晶硼化物沉淀相的非晶/微晶(fcc)基体和转变为板条状马氏体组织的区域占主导地位,还发现以具有fcc结构多孔性晶粒形式发生的明显的非晶态基体的再结晶。发现了在薄层的边界之间观察到的氧化物细束是柱状结晶的α-Cr_2O_3,但也观察到具有球状形态的NiCr_2O_4尖晶石氧化物区。 象动电位试验所揭示的那样,两种合金的涂层在0.5 M H_2SO_4中具有可比的抗腐蚀性能。两种合金涂层的静电位约为-300 mV(SCE),钝化区的电流密度约为 1mA/cm^2,静电位腐蚀试验之试样的显微组织检验表明,薄层边界普遍损坏,尤其是沉积层发生了显著氧化的涂层试样的薄层边界。
基金Project(209069)supported by the Key Research Program of Ministry of Education of ChinaProjects(2008GZC00652007GZC0611)supported by the Natural Science Foundation of Jiangxi Province,China
文摘The Fe40Al-xWC(x=0,10,12,15)coatings with dense structure were successfully deposited by high-velocity oxygen fuel (HVOF)spraying of a mixture of Fe,Al and WC powders.The objective of the present work is to provide insight into the oxidation behavior of the as-deposited coatings at 650℃under 0.1 MPa flowing pure O2.The present results show differences in the oxidation behavior of Fe40Al coating and Fe40Al-xWC composite coatings.The irregular Fe2O3 layer is seen on the top surface of the composite coatings.Fe40Al coating and Fe40Al-15WC composite coating both suffer a catastrophic corrosion due to the formation of a porous structure during 24 h of oxidation.However,Fe40Al-10WC and Fe40Al-12WC composite coatings show a good oxidation resistance behavior due to their dense structure.
