研究了盐雾腐蚀对Ni基高温合金Al-Si防护涂层循环 氧化行为的影响.结果表明，涂层在盐雾腐蚀后，表面Al2O3膜受到破坏，出现大量的腐蚀坑，且蚀坑区域Al含量明显下降.在循环氧化过程中，腐蚀坑内重新生成的Al2O3膜粗糙且易剥落，蚀坑区域出现γ'-Ni3Al相的时间明显提前，从而降低了涂层的耐循环氧化能力，缩短了涂层的寿命.
The Al-Si coating on Ni-base superalloy DZ125 by a salt-spray-test for certain peried.Then the influence of the pre-spray-test on cyclic oxidation behavior of the coating was furthe evaluated.Pits were formed on the surface of the Al-Si coating due to the salt-spray-test.The formation ofγ'-Ni3Al phase at and adjacent to the pits was stimulated owing to the depletion of Al there.The Al2O3 films formed within the pit were rough,which induced the congregation of stresses and therefore increased spallation of the oxide film during the cyclic oxidation.Thus,the oxidation resistance and the lifetime of the coating were obviously reduced by the salt-spray-test.
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