摘要
研究了表面涂覆和未涂覆ＣｅＯ２的２０ＣｒＮｉ４ＶＡ钢在空气中８００℃和１０００℃及控制氧分压下１０００℃的氧化动力学行为。钢在空气中氧化时表面主要生成Ｆｅ２Ｏ３和Ｆｅ３Ｏ４。表面涂覆ＣｅＯ２能降低钢的氧化速率，细化氧化物晶粒，并显著改善氧化皮的抗剥落性能。随氧分压降低，钢表面氧化物的种类和形貌发生变化。一种低氧分压条件下钢表面可形成单一ＦｅＯ膜。并发现在该种条件下，表面涂覆ＣｅＯ２增大了试样的氧化速率。认为是由于ＣｅＯ２成为氧化物形核中心从而能促进氧化物快速生长造成的。
Investigation has been made of the effect of superficially applied ceria on oxidation behavior of 20CrNi4VA steel at 800℃ and 1000℃ in air and under low oxygen partial pressure respectively. The condition of low oxygen partial pressure was obtained by controlling the flow of N 2, H 2O and C 2H 5OH. Fe 2O 3 and Fe 3O 4 were main oxides formed during the oxidation of 20CrNi4VA steel in air. The surperficial CeO 2 coating can decrease the oxidation rate, and improve the spallation resistence of the oxide scales. It also has been shown that the oxide scale is more compact and the oxide grain size is smaller due to the superficially applied ceria. With decreasing oxygen partial pressure, more FeO is formed. Under low oxygen partial pressure, the surperficial CeO 2 coating can increase the oxidation rate of 20CrNi4VA steel. This may be due to that the fine CeO 2 partiales act as nucleation centers for the initial oxide scale.
出处
《腐蚀科学与防护技术》
CAS
CSCD
1996年第4期276-280,共5页
Corrosion Science and Protection Technology
基金
辽宁省科委博士科研起动基金
