摘要
海洋全浸区钢结构的阴极保护效果与海水流动速度及角度有着密切的关系,为此,采用失重法、电化学方法及表面分析技术研究了海水流速及流动角度对Q235钢外加电流阴极保护效果的影响。结果表明:在0～1.5m/s内Q235钢的腐蚀速度随流速增大而增大;在钢裸露面与流动海水成0°,45°和90°时,腐蚀速度依次增大,保护度依次减小;海水流动对Q235钢的阴、阳极极化斜率影响较大;钙镁沉积层主要为文石结构的CaCO3,流动海水使钙镁沉积层减少。
The effects of flow rate and angle of seawater on cathodic protection of Q235 steel under external current were investigated by using weight-loss method,electrochemical method and surface analysis.Results show that corrosiion rate of Q235 steel increases with increasing flow rate of seawater.When the angle between the exposed sur-face of the steel and the flowing seawater increased from 0° to 45° and 90°,the corrosion rate increased,and protection efficiency decreased correspondingly.Besides,flowing seawater had a sig-nificant effect on slopes of anodic and cathodic polarization.The calcium and magnesium precipitates formed on the steel surface were mainly composed of CaCO3 with the structure of aragonite,and the amount of the precipitates decreased due to the presence of flowing seawater.
出处
《材料保护》
CAS
CSCD
北大核心
2010年第8期17-20,28,共5页
Materials Protection
关键词
阴极保护
流动海水
Q235钢
外加电流
钙镁沉积
cathodic protection
flowing seawater
0235 steel
external current
calcium and magnesium precipitates
