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OALib Journal期刊
ISSN: 2333-9721
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(NiCoCrAlYSiB+AlSiY)复合涂层热腐蚀行为的研究
DOI: 10.3724/SP.J.1037.2012.00031, PP. 461-468
Keywords: 电弧离子镀,复合涂层,热腐蚀
Abstract:
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.
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