10CrMoAl热轧薄板不同周期盐雾腐蚀的对比分析
发布时间：2018-10-13 19:09
【摘要】：目的揭示10CrMoAl钢的耐腐的蚀原因及机理。方法通过对10CrMoAl钢进行盐雾试验(72、168、240 h)来模拟其海水腐蚀,并对试验后的试样进行了腐蚀速率、SEM、能谱、XRD及电化学分析及研究。结果 72、168、240 h盐雾腐蚀周期下,试样的腐蚀速率分别为2.352、1.915、2.218 mm/a。72 h盐雾腐蚀试验后,Cr和Mo主要在靠近基体一侧富集;168 h盐雾腐蚀试验后,Cr主要在靠近外表面的锈层处偏聚严重;240 h盐雾腐蚀试验后,在靠近锈层的基体一侧又出现了Cr和Mo的明显偏聚,并同时出现"白亮层"。随着腐蚀时间的延长,锈层中Fe Cr2O_4和γ-Fe_2O_3含量的变化趋势是一致的,即先不断上升,然后趋于稳定。结论随着腐蚀时间的延长,腐蚀速率先降低后升高再降低,最后趋于稳定。腐蚀过程是一个周而复始的循环过程:Cr和Mo在锈层与基体交界处不断富集—形成耐腐蚀层—腐蚀脱落—Cr和Mo在锈层与基体交界处富集。这种富集规律对防腐蚀有一定的作用。此外,Fe Cr2O_4在锈层中含量较多时,具有显著的防腐功能。
[Abstract]:Aim to reveal the reason and mechanism of corrosion resistance of 10CrMoAl steel. Methods the seawater corrosion of 10CrMoAl steel was simulated by salt spray test (72168240 h). The corrosion rate, SEM, spectrum, XRD and electrochemical analysis were studied. Results under 72168240 h salt spray corrosion cycle, After salt spray corrosion test, Cr and Mo were mainly enriched on the side of the substrate after the salt spray corrosion test. After 168h salt spray corrosion test, the Cr was mainly concentrated in the rust layer near the outer surface, and after 240h salt spray corrosion test, the concentration of Cr in the rust layer near the outer surface was serious, and after the salt spray corrosion test for 240h, the concentration of Cr and Mo was higher than that in the salt spray corrosion test. The segregation of Cr and Mo was observed on the side of the substrate near the rust layer, and the "white bright layer" appeared at the same time. With the increase of corrosion time, the content of Fe Cr2O_4 and 纬-Fe_2O_3 in rust layer is the same, that is to say, the content of Fe Cr2O_4 and 纬-Fe_2O_3 in rust layer increases at first and then becomes stable. Conclusion with the prolongation of corrosion time, the corrosion rate decreases first, then increases and then decreases, and finally tends to stabilize. The corrosion process is a cyclic process: Cr and Mo are continuously enriched at the interface between rust layer and matrix, forming corrosion resistant layer, corrosion exfoliation, and Cr and Mo enrichment at the junction of rust layer and matrix. This kind of enrichment law has certain effect on anticorrosion. In addition, Fe Cr2O_4 has obvious anticorrosive function when the content of Fe Cr2O_4 in rust layer is more.
【作者单位】： 江西省机械科学研究所;南昌广播电视大学;山东汇嘉磁电科技有限公司;
【分类号】：TG172
[Abstract]:Aim to reveal the reason and mechanism of corrosion resistance of 10CrMoAl steel. Methods the seawater corrosion of 10CrMoAl steel was simulated by salt spray test (72168240 h). The corrosion rate, SEM, spectrum, XRD and electrochemical analysis were studied. Results under 72168240 h salt spray corrosion cycle, After salt spray corrosion test, Cr and Mo were mainly enriched on the side of the substrate after the salt spray corrosion test. After 168h salt spray corrosion test, the Cr was mainly concentrated in the rust layer near the outer surface, and after 240h salt spray corrosion test, the concentration of Cr in the rust layer near the outer surface was serious, and after the salt spray corrosion test for 240h, the concentration of Cr and Mo was higher than that in the salt spray corrosion test. The segregation of Cr and Mo was observed on the side of the substrate near the rust layer, and the "white bright layer" appeared at the same time. With the increase of corrosion time, the content of Fe Cr2O_4 and 纬-Fe_2O_3 in rust layer is the same, that is to say, the content of Fe Cr2O_4 and 纬-Fe_2O_3 in rust layer increases at first and then becomes stable. Conclusion with the prolongation of corrosion time, the corrosion rate decreases first, then increases and then decreases, and finally tends to stabilize. The corrosion process is a cyclic process: Cr and Mo are continuously enriched at the interface between rust layer and matrix, forming corrosion resistant layer, corrosion exfoliation, and Cr and Mo enrichment at the junction of rust layer and matrix. This kind of enrichment law has certain effect on anticorrosion. In addition, Fe Cr2O_4 has obvious anticorrosive function when the content of Fe Cr2O_4 in rust layer is more.
【作者单位】： 江西省机械科学研究所;南昌广播电视大学;山东汇嘉磁电科技有限公司;
【分类号】：TG172
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