NiCrAlY涂层在模拟垃圾焚烧炉环境中的高温腐蚀行为

High temperature corrosion behavior of NiCrAlY coating in simulated waste incinerator environment

通过电弧离子镀制备NiCrAlY涂层,测试其在模拟垃圾焚烧炉环境中的高温腐蚀性能。结果表明:腐蚀初期,在涂层表面形成混合氧化层,外层由Al_(2)O_(3)和Cr_(2)O_(5)组成,内层为富Ni的氧化层,具有稳定的抗腐蚀能力。随着腐蚀时间的增加,Cl^(-)扩散至涂层/基体界面处,形成金属氯化物,破坏氧化层,形成疏松、多孔的腐蚀层。当温度升至550℃后,涂层腐蚀速度加快,涂层的腐蚀进程明显加速,涂层上的有效元素被快速消耗,导致涂层抗高温腐蚀能力严重下降。

To study high temperature corrosion performance of NiCrAlY coating in simulated waste incinerator flue gas environment,NiCrAlY coating was prepared by arc ion plating technology.The results showed that in the early stage of high-temperature corrosion,a thin mixed oxide layer was formed on the surface of the coating,with the outer layer composed of Al_(2)O_(3)and Cr_(2)O_(5),and the inner composed of Ni-rich oxide,which had stable corrosion resistance.With the increase of corrosion time,Cl ion entered the coating/substrate interface,forming metal chlorides which destroyed the oxide layer and formed a loose,porous corrosion layer.When the temperature rose to 550℃,the corrosion rate of coating accelerated,and the effective oxide elements on the coating were rapidly consumed,resulting in a serious decline in the high temperature corrosion resistance of the coating.