Zhao Xu, Qi Yuhong, Wang Jintao, Zhang Zhanping, Zhu Jing, Quan Linlin, He Dachuan
Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China.
Dalian Marine Propeller Co., Ltd., Dalian 116021, China.
Materials (Basel). 2020 Apr 10;13(7):1790. doi: 10.3390/ma13071790.
To study the effect of cast defects on the corrosion behavior and mechanism of the UNS C95810 alloy in seawater, an investigation was conducted by weight loss determination, scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM), X-ray diffraction (XRD) and electrochemical testing of the specimen with and without cast defects on the surface. The results show that the corrosion rate of the alloy with cast defects is higher than that of the alloy without cast defects, but the defects do not change the composition of the resulting corrosion products. The defects increase the complexity of the alloy microstructure and the tendency toward galvanic corrosion, which reduce the corrosion potential from -3.83 to -86.31 mV and increase the corrosion current density from 0.228 to 0.23 μA⋅cm.
为研究铸造缺陷对UNS C95810合金在海水中腐蚀行为及机理的影响，通过失重测定、扫描电子显微镜（SEM）、共聚焦激光扫描显微镜（CLSM）、X射线衍射（XRD）以及对有和无表面铸造缺陷的试样进行电化学测试展开了一项研究。结果表明，有铸造缺陷的合金的腐蚀速率高于无铸造缺陷的合金，但这些缺陷并未改变所形成的腐蚀产物的成分。缺陷增加了合金微观结构的复杂性以及电偶腐蚀倾向，这使得腐蚀电位从-3.83 mV降至-86.31 mV，并使腐蚀电流密度从0.228 μA·cm增至0.23 μA·cm 。
