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采用动电位极化曲线及恒电位极化法研究了X70管线钢在低温低溶解氧海水中的阴极极化行为,线性极化测试和表面分析技术分析了阴极保护后钙镁沉积层的形成情况.结果表明,8℃、1.5 mg/L溶解氧海水中X70管线钢的析氢电位最正,4℃、3.0 mg/L溶解氧海水中析氢电流密度最小.在低温低溶解氧海水中钙质层难以形成,要得到致密良好的钙质层需要较高的保护电位.低温低溶解氧海水条件有利于Mg(OH)_2沉积,对CaCO_3形成不利.
The cathodic polarization behavior of X70 pipeline steel in low-temperature and low-dissolved-oxygen seawater was investigated by potentiodynamic polarization curves and potentiostatic polarization. The formation of Ca-Mg deposits after cathodic protection was analyzed by linear polarization and surface analysis The results showed that the hydrogen evolution potential of X70 pipeline steel in 1.5 mg / L dissolved oxygen seawater was the highest at 8 ℃, and the lowest in 3.0 ℃ dissolved oxygen seawater at 4 ℃ in 4 ℃, Difficult to form, to obtain a dense and good calcium layer requires a higher protective potential low temperature and low dissolved oxygen seawater conditions conducive to the deposition of Mg (OH) 2, CaCO3 detrimental.