电偶腐蚀的微观机理及其对材料性能的影响

发布时间：2018-07-09 16:28

本文选题：外加应力 + 电偶腐蚀　；参考：《中国机械工程》2017年12期

【摘要】：为探讨应力和电偶双重因素对2A12合金/45钢腐蚀行为的影响,利用专用的加载装置开展了外加应力作用下偶对2A12合金/45钢在3.5%NaCl溶液中的腐蚀行为研究,利用扫描电镜(SEM)和X射线衍射仪等手段观察了试样腐蚀后的微观形貌特征,并采用拉伸试验研究了电偶腐蚀对2A12合金材料力学性能的影响。结果表明,无外加应力时2A12合金表面的宏观腐蚀形态基本为均匀腐蚀。随着外加应力的增大,点蚀面积增大的同时局部腐蚀向基体内部进一步发展。因此,外加应力是通过改变2A12合金表面的细观组织结构和腐蚀形态来加速偶对中阳极材料2A12合金表面腐蚀的,尤其是促进局部腐蚀加剧向基体内部发展。在此基础上,根据不同腐蚀周期内2A12合金的腐蚀特征和失重率,得到了腐蚀材料性能和寿命预测的数学模型。
[Abstract]:In order to investigate the effect of stress and couple on corrosion behavior of 2A12 alloy / 45 steel, the corrosion behavior of 2A12 alloy / 45 steel in 3.5% NaCl solution under applied stress was studied by using a special loading device. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to observe the microstructure of the specimens after corrosion. The effect of galvanic corrosion on the mechanical properties of 2A12 alloy was studied by tensile test. The results show that the macroscopic corrosion morphology of 2A12 alloy is uniform without applied stress. With the increase of applied stress, the pitting area increases and the local corrosion develops further into the matrix. Therefore, the applied stress accelerates the surface corrosion of 2A12 alloy by changing the microstructure and corrosion morphology of the surface of the 2A12 alloy, especially promotes the development of local corrosion to the matrix. On this basis, according to the corrosion characteristics and weight loss rate of 2A12 alloys in different corrosion cycles, a mathematical model for predicting the properties and life of corrosive materials is obtained.
【作者单位】：中国工程物理研究院总体工程研究所;西北工业大学航空学院;
【基金】：国家自然科学基金资助项目(11372295) 中国工程物理研究院重大基金资助项目(2009A0302018);中国工程物理研究院重点学科项目
【分类号】：TG172

【相似文献】