工程科学学报Issue(5)：68-74,7.DOI:10.13374/j.issn2095-9389.2015.05.011
定向凝固合金DZ466在涂 NaCl/Na2 SO4盐条件下热腐蚀行为
Salt-deposit hot corrosion behaviors of directionally solidified DZ466 superalloy
摘要
Abstract
Hot corrosion behaviors of DZ466 alloy at 850℃ and 950℃ were investigated by using a NaCl/Na2 SO4 salt-deposit method. It is found that there are three corrosion layers on the alloy. The outer and the middle layers consist of ( Ni,Co) O oxide and ( Ni,Co) Cr2 O4 with a spinel structure, respectively. The innermost layer is an inner corrosion layer, which consists of Ni3 S2 at 850℃, and the internal oxidation Al2 O3 can be produced close to the middle layer at 950℃. The same hot corrosion mechanism is shown at 850℃ and 950℃. The destruction of the oxidation film continuity is a key reason for hot corrosion of the alloy. The hot corrosion weight gain curves obey a parabolic law at the two temperatures, the rate constants are 3. 1 × 10 -11 g2·cm-4·s-1 and 1. 5 × 10 -9 g2· cm-4·s-1 , and the hot corrosion activation energies are 179. 2 and 138. 3 kJ·mol-1 at 850℃ and 950℃, respectively.关键词
高温合金/定向凝固/涂盐/热腐蚀/腐蚀膜Key words
superalloys/directional solidification/salt deposits/hot corrosion/corrosion films分类
矿业与冶金引用本文复制引用
丁贤飞,陈学达,李青,肖程波,任维鹏,冯强..定向凝固合金DZ466在涂 NaCl/Na2 SO4盐条件下热腐蚀行为[J].工程科学学报,2015,(5):68-74,7.基金项目
国家高技术研究发展计划资助项目(2012AA03A511) （2012AA03A511）
中央高校基本科研业务费资助项目(FRF-TP-14-062A2) （FRF-TP-14-062A2）
高等学校学科创新引智计划资助项目(B12012) （B12012）
