Badea Teodor Adrian, Batalu Dan, Constantin Nicolae, Paraschiv Alexandru, Pătroi Delia, Ceatra Laurentiu Constantin
Romanian Research and Development Institute for Gas Turbines COMOTI, 220D Iuliu Maniu Av., 061126 Bucharest, Romania.
Materials Science and Engineering Faculty, University Politehnica of Bucharest, 060042 Bucharest, Romania.
Materials (Basel). 2022 Jun 8;15(12):4082. doi: 10.3390/ma15124082.
Inconel 625 samples, obtained by Selective Laser Melting (SLM) and conventional technology, were tested for hot corrosion resistance against a molten mixture of NaSO and VO. The assessments were performed in air, at 900 °C with exposure time of up to 96 h, and at 1000 °C for 8 h. Weight gain was higher for samples obtained by SLM, with 37.4% after 8 h, 3.98% after 24 h, 4.46% after 48 h, and 5.8% after 96 h at 900 °C (22.6% at 1000 °C, 8 h). Three stages of corrosion were observed, the first and last with a high corrosion rate, while the second one showed a slower corrosion rate. Corrosion behaviour depends on the morphology of the grain boundary, which can influence the infiltration of corrosive salts, and on the formation of CrNiO compound, which acts as a temporary barrier.
通过选择性激光熔化（SLM）和传统技术获得的因科镍合金625样品，针对NaSO和VO的熔融混合物进行了抗热腐蚀测试。评估在空气中进行，温度为900°C，暴露时间长达96小时，以及在1000°C下进行8小时。通过SLM获得的样品重量增加更高，在900°C下，8小时后为37.4%，24小时后为3.98%，48小时后为4.46%，96小时后为5.8%（在1000°C下8小时为22.6%）。观察到三个腐蚀阶段，第一阶段和最后阶段腐蚀速率高，而第二阶段腐蚀速率较慢。腐蚀行为取决于晶界的形态，晶界形态会影响腐蚀性盐的渗入，还取决于CrNiO化合物的形成，该化合物起到临时屏障的作用。
