将P92耐热钢、304不锈钢、316L不锈钢以及TMS75镍基合金以挂片方式浸泡在超临界NaCl水溶液中进行腐蚀试验,通过分析氧化层的形貌、物相和成分,对其腐蚀行为进行了对比研究.结果表明:P92耐热钢的腐蚀速率最大,为20.37mm· a-1,304和316L不锈钢的腐蚀速率分别为6.27,2.74 mm·a-1,TMS75镍基合金的腐蚀速率最小,为0.67mm· a-1;P92耐热钢表面氧化层存在大块状氧化皮,顶部存在320 μm左右的氧化层;304不锈钢和316L不锈钢表面氧化层中存在少量的氧化皮,侧面不存在氧化层顶部存在很薄的氧化层;TMS75镍基合金的表面氧化层平整致密,侧面氧化层厚约为180 μm,顶面氧化层厚约为120 μm;所有试样的氧化层中均存在穿插于氧化层中的针状NaCl,它使P92耐热钢、304不锈钢和316L不锈钢的氧化层变得疏松、易脱落,但对TMS75镍基合金的氧化层影响较小.
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