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采用恒电流极化、线性极化和表面分析技术研究了Q235钢在低温低溶解氧流动海水中阴极保护初期钙质层的形成情况。结果表明,在低温低氧流动条件下150～800mA/m~2极化电流密度都可以达到Q235钢的最低保护电位,但钙质层难以形成,要得到致密良好的钙质层需要在阴极保护初期提高极化电流密度。低温低氧条件下钙质层的主要成分是CaCO_3,Mg(OH)_2形成不明显。
The formation of calcareous layer at the initial stage of cathodic protection of Q235 steel in low temperature and low dissolved oxygen flow seawater was studied by galvanostatic polarization, linear polarization and surface analysis. The results show that under the condition of low temperature and low oxygen flow, the polarization current density of 150 ~ 800mA / m ~ 2 can reach the minimum protective potential of Q235 steel, but the formation of calcareous layer is hard to form. To obtain the dense and good calcareous layer, Increase the initial polarization current density. Under low temperature and low oxygen conditions, the main component of calcium layer is CaCO_3, Mg (OH) _2 formation is not obvious.