外加电流法对Q235A钢在模拟浪花飞溅区的保护效果  

Protective Effect of Impressed Current Method on Q235A Steel in Simulated Splash Zone

作　　者：符耀庆[1] 王在峰[1] 陈胜利[1] 宋积文[1] 

机构地区：[1]中海油信息科技有限公司北京分公司,北京100027

出　　处：《腐蚀与防护》2016年第10期811-815,共5页Corrosion & Protection

基　　金：中海油综合科研项目(2007003)

摘　　要：在模拟浪花飞溅区环境中采用外加电流法对Q235A钢实施阴极保护,通过保护电流密度、电化学性能试验,腐蚀形貌观察和保护效率计算研究了保护电位对Q235A钢保护效果的影响。结果表明:在恒电位控制下,保护电流密度在初期较大,之后急速下降并逐级稳定在100mA/m2以下;不同保护电位下,由于表面形成钙镁沉积物,试验钢的极化电阻急剧增大;随着保护电位的负移,阻抗弧直径变大,膜的保护性能加强;恒电位控制在-850mV(vs.SCE)及析氢电位之间时,保护效率可以达到98%以上。The method of impressed current was used to protect Q235 A steel in simulated splash zone.The experiments of protective current density,electrochemical properties,morphology observation and calculation of protective efficiency were carried out to study the effect of protective potential on the protective results.The results indicate that under the control of constant potential,the values of initial current density were very large,then decreased rapidly and gradually stabilized below 100 mA/m^2.At different protective potentials,the polarization resistance of the test steel increased rapidly because of the formation of calcium/magnesium deposits on the surface.As the protection potential became negative,the diameters of the impedance arc became larger and the protective property of the film was be strengthened.If the potentials were between-850mV（vs.SCE）and the over potential of hydrogen evolution,the protective efficiency could reach more than 98%.

关 键 词：浪花飞溅区 外加电流法 极化电阻 电化学阻抗 保护效率 

分 类 号：TG174.41[金属学及工艺—金属表面处理]