热轧高Ni高强钢的表面晶界特征和电化学行为  

Surface Grain Boundary Characteristics and Electrochemical Behavior of Hot Rolled High Ni High Strength Steel

作　　者：张蕾[1] 吴素君[1] 孙国进[2] 麻庆申[3] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100191 [2]中国兵器科学研究院宁波分院,宁波315000 [3]首钢技术研究院,北京100041

出　　处：《材料研究学报》2014年第1期67-74,共8页Chinese Journal of Materials Research

摘　　要：采用EBSD技术和原子力显微镜(AFM)测试了10CrNi5Mo高强钢热轧态和热处理态试样的表面晶界分布特征和微观形貌,用模拟海水全浸实验方法及电化学阻抗谱技术测试了10CrNi5Mo高强钢在模拟海水中的腐蚀行为。结果表明:热轧态试样表面具有更高比例的小角度晶界,经硝酸酒精腐蚀后热处理态试样表面腐蚀更为均匀,粗糙度更小。进行模拟海水全浸实验时热轧态试样呈现出更好的耐腐蚀性能,浸泡中期阻抗值增大,表面腐蚀产物与基体结合更为紧密,能保护基体防止其与溶液发生电化学反应。The surface grain boundary distribution characteristics and microtopography of hot rolled and heat treated 10CrNi5Mo high strength steel were tested by EBSD technology and AFM. The corro- sion behavior of 10CrNi5Mo high strength steel was investigated by full immersion tests and electrochem- ical impedance spectroscopy （EIS） in simulated seawater environment. The results show that there is higher proportion of low angle grain boundaries on the surface of hot rolled 10CrNi5Mo high strength steel than that of the heat treated specimen. The corrosion of the heat treated specimen is more uniform and the roughness is less than that of the hot rolled specimen after nital corrosion. In the full immersion tests in simulated seawater environment, the hot rolled 10CrNi5Mo high strength steel presents a better corrosion resistance. The impedance increased in the mid-stage of immersion tests. The integration of corrosion products on the surface and matrix metal is closer so that the corrosion products can prevent the electrochemical reaction between the matrix metal and solution.

关 键 词：材料失效与保护 高强钢 原子力显微镜 交流阻抗谱 

分 类 号：TG172[金属学及工艺—金属表面处理]