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利用扫描俄歇微探针研究了氧化过程中Ni—Cr合金的表面氧化行为。经过600℃、20min的氧化后,作为选择性氧化的结果,Cr和Ni分别在晶界和晶面上以它们的氧化物形式产生富集。较小的氧化铬生成热使铬在晶界区的氧化竞争中得以占先;而晶界为铬的向表面扩散提供了通道;氧化铬的生成,使可扩散铬原子浓度梯度增加,它有利于这种扩散过程的加快。本研究为Ni—Cr合金表面形成抗氧化防腐蚀的氧化铬层提供了理论依据。
The surface oxidation behavior of Ni-Cr alloy during oxidation was investigated by scanning Auger microprobe. After oxidation at 600 ° C for 20 min, Cr and Ni are enriched in their oxide forms at grain boundaries and crystal planes, respectively, as a result of selective oxidation. The smaller chromic oxide generates heat which preferentially competes with the oxidation in the grain boundary region; the grain boundary provides a channel for chromium to diffuse into the surface; the formation of chromium oxide increases the concentration of diffusible chromium atoms, which favors This proliferation is accelerating. This study provides a theoretical basis for the formation of a layer of oxidation resistant and corrosion resistant chromium oxide on the surface of Ni-Cr alloy.