10CrMoAl钢热轧薄板的周浸实验对比分析

为了系统地研究10CrMoAl钢的耐腐蚀性能,对其周浸试验各周期试样进行了腐蚀速率分析、SEM分析、XRD分析及电化学分析.结果表明:腐蚀速率最快的阶段是72～168 h腐蚀阶段,其次是0～72 h腐蚀阶段,最慢的是168～240 h腐蚀阶段.经过168 h腐蚀后,锈层厚度平均为80 μm,是经过72 h腐蚀后的试样锈层厚度的近2倍.经过240 h的腐蚀后,锈层仍然维持在80 μm左右,却出现了50 μm的过渡层.经过168 h和240 h腐蚀所形成的锈层几乎完全阻止了γ-FeOOH和α-FeOOH等稳定产物的形成,从而有效地阻碍了基体的继续腐蚀.此外,锈层中Cr、Mo和Al的富集,也对阻碍腐蚀的进行起到一定的作用.

The Study on Compared Analysis 10CrMoAl Hot Rolled Sheet

In order to systematically study the 10CrMoAl steel corrosion resistance,the corrosion rate analysis,SEM analysis,XRD analysis and electrochemical analysis of the each cycle samples in the cyclic immersion test are implemented.The results show that the stage of the fastest corrosion rate is 72-168 h corrosion stage,the second stage is 0-72 h corrosion stage,and the slowest stage is 168-240 h corrosion stage.After 168 h corrosion,the average rust layer thickness is 80 μm,which is nearly two times asaverage rust layer as the sample after 72 h corrosion.After 240 h corrosion,rust layer remain at about 80 μm,however,the transition layer whose thickness is about 50 μm has come up.The rust layer formed by 168 h and 240 h corrosion almost completely prevents the formation of γ-FeOOH and α-FeOOH,which effectively hinders the corrosion of matrix.In addition,the enrichment of Cr,Mo and Al in rust layer play a part in the inhibition of corrosion.