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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(Na_2SO_4+K_2SO_4和Na_2SO_4+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Cr_2O_3,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Al_2O_3,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Al_2O_3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Cr_2O_3,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.
NiCoCrAlYSiB coating (common coating) and (Ni-CoCrAlYSiB + AlSiY) composite coating were prepared by arc ion plating (AIP) on Ni-based single crystal superalloy substrate. The effects of superalloy substrate and two coatings (Na_2SO_4 + K_2SO_4 and Na_2SO_4 + NaCl) were investigated at 900 and 700 ℃ respectively.The results showed that NiO mainly formed on the surface of matrix alloy under the condition of high temperature (900 ℃), and Cr_2O_3 mainly formed on the surface of common coating, And the internal oxidation and internal vulcanization appeared in the coating. Al 2 O 3 was mainly formed on the surface of the composite coating, and the inner layer was oxidized to a lesser extent and the Al content of the coating surface was still high, which maintained the formation and repair of Al 2 O 3 film on the surface. 700 ℃), NiO was mainly formed on the surface of the matrix alloy. Cr2O3 was mainly formed on the surface of the common coating, which resulted in serious internal oxidation inside the coating. Internal oxidation occurred on the surface of the composite coating, and the inner layer of the high Cr was not corroded , Helps to improve the coating’s corrosion resistance.