温度对Fe-0.21C-25Mn-5Cr-2Al-2Ni TWIP钢CO_2腐蚀的影响

Influence of Temperature on CO_2 Corrosion of Fe-0.21C-25Mn-5Cr-2AI-2Ni TWIP Steel

在CO_2压力2 MPa条件下,通过不同温度下的腐蚀速率计算、腐蚀产物形貌SEM观察以及腐蚀产物元素和成分的EDS、XPS分析,研究了Fe-..21C-25Mn-5Cr-2Al-2Ni TWIP钢在不同温度下的腐蚀情况,讨论了不同温度下的腐蚀机理。结果表明,腐蚀速率随温度升高先上升后下降;温度在60℃时,腐蚀产物膜很薄,整体均匀,有小面积点蚀,腐蚀产物主要是含铬物质;当温度达到90℃时产物膜呈片状,排列松散,腐蚀均匀,主要腐蚀产物为铬、铝生成的氢氧化物;当温度达到120℃时产物膜呈方型颗粒状,堆垛紧密,均匀腐蚀,有晶体生长痕迹,主要腐蚀产物为铁,锰碳酸盐。

The corrosion and corrosion mechanism at different temperatures of TWIP steel（Fe-0. 21C-25Mn-5Cr- 2A1-2Ni） were studied by calculating the corrosion rates at different temperatures, observing the corrosion product morphology of SEM, analyzing the elements and components of corrosion products with EDS and XPS, when the pressure of CO2 was 2 MPa. It was found that the corrosion rate increased first and then decreased with temperature rising. The corrosion product film which had a small area of pitting and contained Cr materials mostly was very thin and uniform as a whole when temperature was 60℃. The product film was sheet and loosely arranged and uniform, and was mainly composed of hydroxide of Cr and A1 when the temperature reached 90℃. The product film which had traces of crystal growth was rectangular granular and close stacking and uniform when the temperature reaches 120 ℃, and it was carbonates of Fe and Mn.