通过磁控溅射方法在K38G合金上沉积了一层与其同成分的纳米晶涂层.研究了铸态K38G合金及其纳米晶涂层在900℃的涂盐(盐的成分为75%Na2SO4+25%K2SO4)热腐蚀行为.结果表明:当涂薄盐膜时(0.8mg/cm2),纳米晶涂层表面生成一层连续的A12O3膜,消除了内硫化;当涂厚盐膜时(3 mg/cm2),纳米晶涂层表面氧化产物为Al2O3、Cr2O3和TiO2混合氧化物,虽然没有消除内硫化,但纳米晶涂层仍然提高了合金的抗热腐蚀性能.并讨论了纳米晶涂层的抗热腐蚀机理.
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