采用电弧离子镀(AIP)技术在镍基单晶高温合金基体上制备了NiCoCrAlYSiB涂层 (普通涂层)和(Ni- CoCrAlYSiB+AlSiY)复合涂层, 研究了高温合金基体与2种涂层分别在900和700 ℃下的涂盐(Na2SO4+K2SO4和Na2SO4+NaCl)热腐蚀行为. 结果表明: 高温(900 ℃)热腐蚀条件下, 基体合金表面主要生成NiO; 普通涂层表面主要生成Cr2O3, 而且涂层内部出现内氧化和内硫化现象; 复合涂层表面主要生成Al2O3, 外层出现程度较轻的内氧化, 涂层表层Al含量仍然较高, 维持表面Al2O3膜的形成和修复. 低温(700 ℃)热腐蚀条件下, 基体合金表面主要生成NiO; 普通涂层表面主要生成Cr2O3, 涂层内部出现严重的内氧化; 复合涂层表面也出现了内氧化, 高Cr的内层未受腐蚀, 有助于提高涂层的抗腐蚀性能.
Two kinds of the coatings, the conventional NiCoCrAlYSiB coating and the composite coating (NiCoCrAlYSiB+AlSiY), were prepared using arc ion plating (AIP) on the Ni base single crystal superalloy substrate. Comparative studies of the hot corrosion behaviors of the substrate and two different coatings in Na2SO4 + K2SO4 and Na2SO4 + NaCl at 900 and 700 ℃ were investigated. The results showed that, during the hot corrosion at 900 ℃, NiO was formed on the surface of the substrate while Cr2O3 was formed on the surface of the conventional coating with the formation of internal oxidation and sulfidation, and Al2O3 was formed on the surface of the composite coating. Slighter internal oxidation appeared in the outer layer of the composite coating. The composite coating contained sufficient Al reservoirs to supply the formation and repair of Al2O3. During the hot corrosion at 700 ℃, NiO was formed on the surface of the substrate and Cr2O3 was formed on the surface of the conventional coating with severe internal oxidation, while internal oxidation appeared in the outer layer of the composite coating. The Cr-enriched inner layer did not suffer from corrosion damage, which can improve the corrosion resistance of the composite coating.
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